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WO2009139257A1 - Matière piézoélectrique organique, sonde ultrasonore et composition de résine - Google Patents

Matière piézoélectrique organique, sonde ultrasonore et composition de résine Download PDF

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Publication number
WO2009139257A1
WO2009139257A1 PCT/JP2009/057572 JP2009057572W WO2009139257A1 WO 2009139257 A1 WO2009139257 A1 WO 2009139257A1 JP 2009057572 W JP2009057572 W JP 2009057572W WO 2009139257 A1 WO2009139257 A1 WO 2009139257A1
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Prior art keywords
group
general formula
piezoelectric material
organic piezoelectric
ultrasonic
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Ceased
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PCT/JP2009/057572
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English (en)
Japanese (ja)
Inventor
理枝 藤澤
福坂　潔
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Konica Minolta Medical and Graphic Inc
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Konica Minolta Medical and Graphic Inc
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Priority to JP2010511930A priority Critical patent/JP5652203B2/ja
Publication of WO2009139257A1 publication Critical patent/WO2009139257A1/fr
Anticipated expiration legal-status Critical
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    • C—CHEMISTRY; METALLURGY
    • C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
    • C08G—MACROMOLECULAR COMPOUNDS OBTAINED OTHERWISE THAN BY REACTIONS ONLY INVOLVING UNSATURATED CARBON-TO-CARBON BONDS
    • C08G18/00—Polymeric products of isocyanates or isothiocyanates
    • C08G18/06—Polymeric products of isocyanates or isothiocyanates with compounds having active hydrogen
    • C08G18/28—Polymeric products of isocyanates or isothiocyanates with compounds having active hydrogen characterised by the compounds used containing active hydrogen
    • C08G18/30—Low-molecular-weight compounds
    • C08G18/32—Polyhydroxy compounds; Polyamines; Hydroxyamines
    • C08G18/3203—Polyhydroxy compounds
    • C08G18/3206—Polyhydroxy compounds aliphatic
    • C—CHEMISTRY; METALLURGY
    • C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
    • C08G—MACROMOLECULAR COMPOUNDS OBTAINED OTHERWISE THAN BY REACTIONS ONLY INVOLVING UNSATURATED CARBON-TO-CARBON BONDS
    • C08G18/00—Polymeric products of isocyanates or isothiocyanates
    • C08G18/06—Polymeric products of isocyanates or isothiocyanates with compounds having active hydrogen
    • C08G18/70—Polymeric products of isocyanates or isothiocyanates with compounds having active hydrogen characterised by the isocyanates or isothiocyanates used
    • C08G18/72—Polyisocyanates or polyisothiocyanates
    • C08G18/74—Polyisocyanates or polyisothiocyanates cyclic
    • C08G18/76—Polyisocyanates or polyisothiocyanates cyclic aromatic
    • C08G18/7657—Polyisocyanates or polyisothiocyanates cyclic aromatic containing two or more aromatic rings
    • C08G18/7685—Polyisocyanates or polyisothiocyanates cyclic aromatic containing two or more aromatic rings containing two or more non-condensed aromatic rings directly linked to each other
    • H—ELECTRICITY
    • H10—SEMICONDUCTOR DEVICES; ELECTRIC SOLID-STATE DEVICES NOT OTHERWISE PROVIDED FOR
    • H10N—ELECTRIC SOLID-STATE DEVICES NOT OTHERWISE PROVIDED FOR
    • H10N30/00—Piezoelectric or electrostrictive devices
    • H10N30/80—Constructional details
    • H10N30/85—Piezoelectric or electrostrictive active materials
    • H10N30/857—Macromolecular compositions

Definitions

  • the present invention relates to a resin composition and an organic piezoelectric material containing a polymer having a condensed ring structure.
  • acoustic devices such as microphones and speaker diaphragms
  • measuring devices such as various pressure sensors, ultrasonic probe, vibration sensors that detect mutations such as genes and proteins with high sensitivity, etc.
  • the present invention relates to an organic piezoelectric material having piezoelectricity that can be used to convert electrical energy.
  • the pyroelectric material a so-called inorganic material in which a single crystal such as quartz, LiNbO 3 , LiTaO 3 , KNbO 3 , a thin film such as ZnO or AlN, or a sintered body such as Pb (Zr, Ti) O 3 is subjected to polarization treatment.
  • Piezoelectric materials are widely used. However, these inorganic piezoelectric materials have characteristics such as high elastic stiffness, high mechanical loss coefficient, high density and high dielectric constant.
  • organic piezoelectric materials such as polyvinylidene fluoride (hereinafter abbreviated as “PVDF”) and polycyanovinylidene (hereinafter abbreviated as “PVDCN”) have also been developed (see Patent Document 1).
  • PVDF polyvinylidene fluoride
  • PVDCN polycyanovinylidene
  • This organic piezoelectric material is excellent in workability such as thin film and large area, can be made in any shape and shape, and has features such as low elastic modulus and low dielectric constant, so it can be used as a sensor. When considering the use of, it has a feature that enables highly sensitive detection.
  • organic piezoelectric materials have low heat resistance and lose their pyroelectric properties at high temperatures, and the physical properties such as elastic stiffness are greatly reduced.
  • polyurea resin compositions composed of urea bonds have a large dipole moment of urea bonds and are excellent in temperature characteristics as resins. Therefore, various studies have been made on organic piezoelectric materials. . For example, there is a so-called vapor deposition polymerization method in which a polyurea film is formed by simultaneously evaporating a diisocyanate compound such as 4,4′-diphenylmethane diisocyanate (MDI) and a diamine compound such as 4,4′-diaminodiphenylmethane (MDA). (See Patent Document 2 and Patent Document 3).
  • MDI 4,4′-diphenylmethane diisocyanate
  • MDA 4,4′-diaminodiphenylmethane
  • the polyurea resin composition prepared by the vapor deposition polymerization method described in these documents has a non-uniform molecular weight of the oligomer or high molecular weight product. In this state, the polyurea resin composition is formed. For this reason, the dipole moment of the urea bond cannot be fully utilized, and further improvement has been demanded as an organic piezoelectric material.
  • the present invention has been made in view of the above-described problems and situations, and the problem to be solved is as an organic piezoelectric material having piezoelectricity that is excellent in piezoelectric characteristics and capable of converting mechanical stimulation into electrical energy, and particularly oriented. It is an object to provide an organic piezoelectric material having high performance and being thermally stable.
  • An organic piezoelectric material comprising a polymer containing at least one repeating unit represented by the following general formula (1).
  • X is one selected from a urea group, a urethane group, an ester group, an amide group, a sulfonamide group, a carbonate group, an ether group, a thioether group, and a carbonyl group.
  • X is a divalent linking group comprising one group selected from a urea group, a urethane group, and an amide group, or a combination of two or more thereof.
  • An ultrasonic probe including an ultrasonic transmission transducer and an ultrasonic reception transducer, wherein the ultrasonic transducer using the organic piezoelectric material according to any one of 1 to 6 is ultrasonicated.
  • An ultrasonic probe comprising a receiving transducer.
  • a resin composition comprising a polymer containing at least one repeating unit represented by the following general formula (2).
  • X 2 represents a divalent linking group composed of one group selected from a urea group, a urethane group, an ester group, and an amide group, or a combination of two or more thereof.
  • a 2 represents a condensed ring composed of three or more rings.
  • an organic piezoelectric material having high orientation and thermal stability and excellent piezoelectric characteristics could be provided.
  • the present invention can provide an organic piezoelectric material having excellent piezoelectricity and improved conventional problems by using a polymer containing at least one repeating unit represented by the general formula (1).
  • the resin composition of the present invention which contains a polymer containing at least one repeating unit represented by the general formula (2), has not only high orientation and excellent piezoelectricity, but also heat In terms of stability, it can be effectively used as a highly versatile resin.
  • X represents a divalent linking group.
  • X examples include alkylene group, phenylene group, amino group, sulfonyl group, urea group, urethane group, ester group, amide group, sulfonamide group, carbonate group, ether group, thioether. Groups, carbonyl groups and the like, and these linking groups may be further combined to form a composite group.
  • n linking groups represented by X may be linked to form (X) n. At this time, n is an integer of 1 to 4.
  • X is preferably one group selected from a urea group, a urethane group, an ester group, an amide group, a sulfonamide group, a carbonate group, an ether group, a thioether group, and a carbonyl group, or two of them.
  • the divalent linking group is a combination of the above, more preferably a urea group, a urethane group, an ester group, an amide group, an ether group, still more preferably a urea group, a urethane group, or an amide group.
  • A represents a condensed ring.
  • a condensed ring refers to a cyclic structure formed by a carbocyclic ring or a heterocyclic ring in which two or more of the atoms constituting the ring are bonded together with another ring.
  • the condensed ring represented by A is preferably a condensed ring containing one aromatic ring, more preferably three rings selected from the group consisting of an aromatic ring, a heterocyclic ring and an aliphatic ring. It is a condensed ring.
  • naphthalene anthracene, phenanthrene, fluorene, triphenylene, naphthacene, indole, benzofuran, benzothiophene, isobenzofuran, quinolidine, quinoline, phthalazine, naphthyridine, quinoxaline, quinoxazoline, carbazole, phenanthridine, acridine, phenanthroline, thianthrene.
  • the condensed ring structure described above may further have a substituent well known in the art.
  • the condensed ring represented by A is preferably naphthalene, anthracene, phenanthrene, fluorene, triphenylene, indole, benzofuran, benzothiophene, carbazole, phenanthridine, acridine, phenanthroline, phenothiazine, dibenzofuran, and more preferably anthracene, phenanthrene.
  • the polymer containing at least one repeating unit represented by the general formula (1) can be synthesized by a known method.
  • Organic piezoelectric material of the present invention is formed by forming a film using a resin composition containing a polymer containing at least one repeating unit represented by the general formula (1), or on the resin composition film.
  • an organic piezoelectric film can be formed by further performing a polarization treatment.
  • the organic piezoelectric film when a stress is applied to the piezoelectric film, charges of opposite signs appear in proportion to both ends of the piezoelectric film, that is, an electric polarization phenomenon occurs, and conversely, the piezoelectric material is transmitted. It has the property (piezoelectric performance) that a distortion proportional to the occurrence of the electric field (applying an electric field) is generated.
  • a large piezoelectric effect is generated by polarization due to orientation freezing of the dipole moment of the polymer main chain or side chain.
  • the organic piezoelectric film is preferably formed by coating.
  • the coating method include spin coating, solvent casting, melt casting, roll coating, flow coating, printing, dip coating, and bar coating.
  • a polymerized resin composition may be used, or after applying polyurea and a macromonomer, polymerization by heating may be performed.
  • the solvent may be completely distilled off under heating or reduced pressure conditions.
  • the temperature is further increased after removing a predetermined amount of the solvent.
  • the solvent may be distilled off and polymerization may be performed simultaneously.
  • a method of performing polarization treatment described later on the formed film is preferable.
  • the polarization treatment may be performed after polymerization, or the polarization treatment is performed simultaneously with polymerization. May be. Particularly preferred is a method in which polymerization by heating and polarization treatment are performed simultaneously.
  • the temperature is preferably ⁇ 50 to 250 ° C., more preferably ⁇ 50 to 200 ° C. A method of changing the temperature in the above temperature range is also preferable.
  • the corona discharge treatment can be performed by using a commercially available apparatus comprising a high voltage power source and electrodes.
  • the voltage of the high-voltage power supply is -1 to -20 kV
  • the current is 1 to 80 mA
  • the distance between the electrodes is 1 to 10 cm.
  • the applied voltage is preferably 0.5 to 2.0 MV / m.
  • electrodes needle-like electrodes, linear electrodes (wire electrodes), and mesh electrodes conventionally used are preferable, but the invention is not limited thereto.
  • the corona discharge treatment when the corona discharge treatment is performed as the polarization treatment in the state where the solvent of the raw material solution remains, the volatile components of the solvent are removed in order to avoid the danger of flammable explosion. It is necessary for safety to carry out with sufficient ventilation.
  • the selection of the substrate differs depending on the application and use method of the organic piezoelectric film of the present invention. It may be a plastic plate or film such as polyimide, polyamide, polyimide amide, polyethylene terephthalate (PET), polyethylene naphthalate (PEN), polymethyl methacrylate (PMMA), polycarbonate resin, cycloolefin polymer.
  • the surface may be covered with aluminum, gold, copper, magnesium, silicon or the like.
  • a single crystal plate or film of aluminum, gold, copper, magnesium, silicon alone, or a rare earth halide may be used.
  • a multilayer piezoelectric element In a method of using a multilayer in which piezoelectric elements are laminated, there is a method in which the organic piezoelectric film of the present invention is superposed on a ceramic piezoelectric element via an electrode.
  • PZT is used as the ceramic piezoelectric element, but in recent years, one containing no lead has been recommended. PZT is preferably within the range of the formula of Pb (Zr 1-X Ti X ) O 3 (0.47 ⁇ X ⁇ 1).
  • lithium niobate LiNbO 3
  • potassium niobium tantalate K (Ta, Nb) O 3
  • barium titanate BaTiO 3
  • lithium tantalate LiTaO 3
  • strontium titanate SrTiO 3
  • the composition of various ceramic materials can be selected as appropriate in terms of performance.
  • the ultrasonic transducer according to the present invention is characterized by using an organic piezoelectric film formed using the organic piezoelectric material of the present invention.
  • the ultrasonic transducer is preferably an ultrasonic receiving transducer used in an ultrasonic medical diagnostic imaging device probe including an ultrasonic transmitting transducer and an ultrasonic transmitting transducer. .
  • an ultrasonic vibrator has a pair of electrodes sandwiched between layers (or films) made of a film-like piezoelectric material (also referred to as “piezoelectric film”, “piezoelectric film”, or “piezoelectric layer”).
  • An ultrasonic probe is configured by arranging a plurality of transducers, for example, one-dimensionally.
  • a predetermined number of transducers in the major axis direction in which a plurality of transducers are arranged is set as the aperture, and the plurality of transducers belonging to the aperture are driven to converge the ultrasonic beam on the measurement site in the subject. And has a function of receiving reflected echoes of ultrasonic waves emitted from the subject by a plurality of transducers belonging to the aperture and converting them into electrical signals.
  • An ultrasonic receiving transducer is a transducer used in a probe for an ultrasonic medical image diagnostic apparatus, and is formed using the organic piezoelectric material of the present invention as a piezoelectric material constituting the transducer.
  • An organic piezoelectric film is used.
  • the organic piezoelectric material or the organic piezoelectric film used for the ultrasonic receiving vibrator preferably has a relative dielectric constant of 10 to 50 at the thickness resonance frequency.
  • the adjustment of the relative dielectric constant is carried out by adjusting the number, composition, polymerization degree, etc. of polar functional groups such as CF 3 groups and CN groups of the substituent R contained in the compound constituting the organic piezoelectric material, and the polarization treatment described above Can be done by.
  • the ultrasonic transmission vibrator according to the present invention is preferably made of a piezoelectric material having an appropriate relative dielectric constant in relation to the reception vibrator. Moreover, it is preferable to use a piezoelectric material excellent in heat resistance and voltage resistance.
  • ultrasonic transmission vibrator constituting material
  • various known organic piezoelectric materials and inorganic piezoelectric materials can be used.
  • organic piezoelectric material a polymer material similar to the above-described organic piezoelectric material for constituting an ultrasonic receiving vibrator can be used.
  • Inorganic materials include quartz, lithium niobate (LiNbO 3 ), potassium tantalate niobate [K (Ta, Nb) O 3 ], barium titanate (BaTiO 3 ), lithium tantalate (LiTaO 3 ), or titanate Lead zirconate (PZT), strontium titanate (SrTiO 3 ), barium strontium titanate (BST), or the like can be used.
  • PZT is preferably Pb (Zr 1-n Ti n ) O 3 (0.47 ⁇ n ⁇ 1).
  • the piezoelectric (body) vibrator according to the present invention is manufactured by forming electrodes on both surfaces or one surface of a piezoelectric film (layer) and polarizing the piezoelectric film.
  • the electrode is formed using an electrode material mainly composed of gold (Au), platinum (Pt), silver (Ag), palladium (Pd), copper (Cu), nickel (Ni), tin (Sn), or the like. .
  • a base metal such as titanium (Ti) or chromium (Cr) is formed to a thickness of 0.02 to 1.0 ⁇ m by sputtering, and then the metal mainly composed of the above metal element and the above A metal material made of the above alloy, and further, if necessary, a part of insulating material is formed to a thickness of 1 to 10 ⁇ m by sputtering or other suitable methods.
  • these electrodes can be formed by screen printing, dipping, or thermal spraying using a conductive paste in which a fine metal powder and low-melting glass are mixed.
  • a piezoelectric element can be obtained by supplying a predetermined voltage between the electrodes formed on both surfaces of the piezoelectric film to polarize the piezoelectric film.
  • the ultrasonic probe according to the present invention is a probe for an ultrasonic diagnostic imaging apparatus including an ultrasonic transmission transducer and an ultrasonic reception transducer.
  • the ultrasonic receiving vibrator according to the above is used.
  • both the transmission and reception of ultrasonic waves may be performed by a single transducer, but more preferably, the transducer is configured separately for transmission and reception in the probe.
  • the piezoelectric material constituting the transmitting vibrator may be a conventionally known ceramic inorganic piezoelectric material or an organic piezoelectric material.
  • the ultrasonic receiving transducer of the present invention can be arranged on or in parallel with the transmitting transducer.
  • the structure for laminating the ultrasonic receiving transducer of the present invention on the ultrasonic transmitting transducer is good, and in this case, the ultrasonic receiving transducer of the present invention is another high-frequency transducer.
  • the film thickness of the receiving vibrator and the other polymer material be matched to a preferable receiving frequency band in terms of probe design. In view of a practical ultrasonic medical image diagnostic apparatus and biological information collection from a practical frequency band, the film thickness is preferably 40 to 150 ⁇ m.
  • the probe may be provided with a backing layer, an acoustic matching layer, an acoustic lens, and the like. Also, a probe in which vibrators having a large number of piezoelectric materials are two-dimensionally arranged can be used. A plurality of two-dimensionally arranged probes can be sequentially scanned to form a scanner.
  • the ultrasonic probe according to the present invention can be used for various types of ultrasonic diagnostic apparatuses.
  • it can be suitably used in an ultrasonic medical image diagnostic apparatus as shown in FIG.
  • FIG. 1 is a conceptual diagram showing a configuration of a main part of an ultrasonic medical image diagnostic apparatus according to an embodiment of the present invention.
  • This ultrasonic medical diagnostic imaging apparatus transmits an ultrasonic wave to a subject such as a patient, and an ultrasonic probe in which piezoelectric vibrators that receive ultrasonic waves reflected by the subject as echo signals are arranged. (Probe).
  • an electric signal is supplied to the ultrasonic probe to generate an ultrasonic wave, and a transmission / reception circuit that receives an echo signal received by each piezoelectric vibrator of the ultrasonic probe, and transmission / reception control of the transmission / reception circuit
  • a transmission / reception control circuit is provided.
  • an image data conversion circuit for converting the echo signal received by the transmission / reception circuit into ultrasonic image data of the subject is provided. Further, a display control circuit for controlling and displaying the monitor with the ultrasonic image data converted by the image data conversion circuit and a control circuit for controlling the entire ultrasonic medical image diagnostic apparatus are provided.
  • the transmission / reception control circuit, the image data conversion circuit, and the display control circuit are connected to the control circuit, and the control circuit controls the operations of these units. Then, an electrical signal is applied to each piezoelectric vibrator of the ultrasonic probe to transmit an ultrasonic wave to the subject, and the reflected wave caused by acoustic impedance mismatch inside the subject is detected by the ultrasonic probe. Receive at.
  • the transmission / reception circuit corresponds to “means for generating an electric signal”
  • the image data conversion circuit corresponds to “image processing means”.
  • the ultrasonic diagnostic apparatus by utilizing the characteristics of the ultrasonic wave receiving vibrator excellent in piezoelectric characteristics and heat resistance of the present invention and suitable for high frequency and wide band, the image quality and its An ultrasonic image with improved reproduction and stability can be obtained.
  • X 2 represents one group selected from a urea group, a urethane group, an ester group, and an amide group or a divalent linking group composed of a combination of two or more thereof, and A 2 represents three groups.
  • a condensed ring composed of the above rings is represented.
  • condensed ring represented by A 2 include a condensed ring composed of three or more rings among the examples given as specific examples of the condensed ring represented by A in the general formula (1).
  • a 2 is preferably anthracene, phenanthrene, fluorene, triphenylene, carbazole, phenanthridine, acridine, phenanthroline, or phenothiazine.
  • polymer containing at least one repeating unit represented by the general formula (2) examples include P-1, P-2, P-7 to P-10, and P-12 to P- 16, P-18 to P-20, P-22, P-26 to P-31, P-34 to P-38, P-40, P-41, P-43 to P-51, P-54, P-59, P-60 and the like.
  • the resin composition characterized by containing a polymer containing at least one repeating unit represented by the general formula (2) in the present invention is used in a field where a piezoelectric polymer or pyroelectric polymer has been used.
  • a piezoelectric polymer or pyroelectric polymer has been used.
  • it can be used and is not particularly limited, for example, it is utilized in the acoustic field, ultrasonic field, medical / industrial field, taking advantage of characteristics such as piezoelectricity, workability, and film forming property.
  • it can be used for speakers, ultrasonic transducers, infrared sensors, and the like.
  • Comparative resin composition films A to C were produced in the same manner as in Example 4 except that the following comparative polymers A to C were used instead of the polymer represented by the general formula (1).
  • the obtained resin composition film was evaluated for piezoelectric characteristics while being heated to room temperature and 100 ° C. by a resonance method.
  • the piezoelectric characteristics were measured using an impedance analyzer (Precision Impedance Analyzer 4294A manufactured by Agilent).
  • the evaluation results are shown in Table 1.
  • the piezoelectric characteristics are shown as relative values with respect to Comparative-C (PVDF film) measured at room temperature as 100%.
  • the piezoelectric ceramic raw material powder having a particle diameter of 100 nm was obtained by changing the pulverization time and pulverization conditions.
  • 6% by mass of pure water as a binder is added to each piezoelectric ceramic raw material powder having a different particle diameter, press-molded to form a plate-shaped temporary molded body having a thickness of 100 ⁇ m, and this plate-shaped temporary molded body is vacuum-packed and then 235 MPa. It shape
  • the molded body was fired.
  • the final sintered body had a thickness of 20 ⁇ m.
  • the firing temperature was 1100 ° C.
  • An electric field of 1.5 ⁇ Ec (MV / m) or more was applied for 1 minute to perform polarization treatment.
  • Ec coercive electric field strength
  • a laminated vibrator was produced in which the organic piezoelectric film produced in Example 1 and a polyester film having a thickness of 50 ⁇ m were bonded together with an epoxy adhesive. Thereafter, polarization treatment was performed in the same manner as described above.
  • an ultrasonic probe was prototyped by laminating a laminated receiving transducer on the above-described piezoelectric material for transmission, and installing a backing layer and an acoustic matching layer.
  • a probe similar to the above-described ultrasonic probe was produced using the comparative resin composition film-A instead of the above-described laminated resonator for reception.
  • the reception sensitivity is originating the fundamental frequency f 1 of 5 MHz, to determine the received relative sensitivity of 20MHz as 15 MHz, 4 harmonics as received second harmonic wave f 2 as 10 MHz, 3 harmonic.
  • a sound intensity measurement system Model 805 (1 to 50 MHz) of Sonora Medical System, Inc. (Sonora Medical System, Inc: 2021 Miller Drive Longmont, Colorado (0501 USA)) was used.
  • the dielectric breakdown strength was measured by multiplying the load power P by 5 times, testing for 10 hours, and then returning the load power to the standard to evaluate the relative reception sensitivity.
  • the sensitivity was evaluated as good when the decrease in sensitivity was within 1% before the load test.
  • the ultrasonic probe including the receiving piezoelectric (body) laminated vibrator according to the present invention has a relative receiving sensitivity about 1.3 times that of the comparative example, and has a dielectric breakdown. It was confirmed that the strength was good. That is, it was confirmed that the ultrasonic wave receiving transducer of the present invention can be suitably used for a probe used in an ultrasonic medical image diagnostic apparatus as shown in FIG.

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  • Health & Medical Sciences (AREA)
  • Chemical Kinetics & Catalysis (AREA)
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  • Polymers & Plastics (AREA)
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  • Physics & Mathematics (AREA)
  • Spectroscopy & Molecular Physics (AREA)
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Abstract

L'invention porte sur une matière piézoélectrique organique ayant d'excellentes caractéristiques piézoélectriques, et qui est apte à convertir un stimulus mécanique en énergie électrique. En particulier, la matière piézoélectrique organique a une orientation élevée, tout en étant thermiquement stable. La matière piézoélectrique organique est caractérisée par le fait qu'elle contient un polymère ayant au moins une unité récurrente représentée par la formule générale (1) suivante. –X-A- (1). Dans la formule générale (1), X représente un groupe de liaison divalent et A représente un noyau fusionné.
PCT/JP2009/057572 2008-05-15 2009-04-15 Matière piézoélectrique organique, sonde ultrasonore et composition de résine Ceased WO2009139257A1 (fr)

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WO2016143251A1 (fr) * 2015-03-09 2016-09-15 Ricoh Company, Ltd. Élément et générateur électrique
CN117623952A (zh) * 2023-12-15 2024-03-01 吉林大学 一种基于萘和菲多环芳烃的聚醚单体

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