A kind of aromatic series super-branched polyimide and its preparation method and application
Technical field
The present invention relates to materials science field, especially a kind of aromatic series super-branched polyimide and preparation method thereof.
Technical background
Polyimides refers to the quasi polymer on main chain containing imide ring.It can be divided into according to the difference of its molecular structure
Aroma type polyimides and lard type polyimides.Wherein, aromatic polyimide is with its low-dielectric, high mechanicalness, easily system
Standby, particularly high thermal stability;Therefore, it is widely applied in many high and new technology fields.
However, the high thermal stability of aromatic polyimide makes many polyimides dissolubilities poor, in order to improve
The solubility property and processing performance of aromatic polyimide introduce branched structure in polyimides and prepare super-branched polyimide
(HBPIs).Super-branched polyimide has a series of excellent due to the advantages of that has both both polyimides and dissaving polymer
Comprehensive performance, such as high temperature resistant, high intensity, high dielectric, crystallinity it is low or do not crystallize, solution viscosity is low and dissolubility is good,
To obtain the concern and research of vast researcher.Its product has been developed and applied to gas separation membrane and permeable membrane etc.
Membrane material and other such as photosensitive, optical waveguides, liquid crystal, sensor (detecting electrode) and dielectric material high and new technology material neck
Domain.Relative to linear polyimide material, distance is big between super-branched polyimide strand, this improves its dissolubility, but
It is its heat resistance relative drop, which has limited it in space flight, aviation aircraft structure or function component and rocket, guided missile etc.
Part field extensive use.Therefore, on the basis of keeping super-branched polyimide high solubility, while it is improved
Heat resistance, this is of great significance to its application in high temperature resistant field is expanded.
The present invention introduces multiple rigid aromatic structures in super-branched polyimide main chain, and polymer on the one hand can be improved
Heat resistance since multiple rigid aromatic structures are introduced into super-branched polyimide main chain, polymerization on the other hand can be expanded
The distance between object chain, increases the free volume of polymer, further improves its dissolubility and processing performance, improves its gas infiltration
Permeability energy.Super-branched polyimide of the present invention has high glass-transition temperature and thermal stability, lower thermal expansion system simultaneously
Several and excellent solubility properties has preferable application in the Material Fields such as high temperature resistant field and gas permeability and separation film
Prospect.
Summary of the invention
The object of the present invention is to provide a kind of aromatic series super-branched polyimides.
Another object of the present invention is to provide a kind of above-mentioned preparation methods of aromatic series super-branched polyimide.
The object of the present invention is achieved like this: a kind of aromatic series super-branched polyimide material, general formula of molecular structure
It is as follows:
Wherein: m, z, n are 1~10000, and Y structure is as shown in general formula I:
I:
Wherein Ar1Selected from any one of following structural:
Preferably, the Ar1It is selected from
Wherein Ar2Selected from any one of following structural:
Preferably, the Ar2It is selected from
One of.
X be selected from one of following general structure or more than one:
Preferably, the m, z, the integer that n is 100~5000.
Further, it is preferable to the m, z, the integer that n is 1000~2000.
Another object of the present invention is to provide a kind of preparation method of above-mentioned aromatic series super-branched polyimide, this method
Are as follows: in molar ratio it is 1:(0.8~2.5 by the triamine containing Y structure and the dianhydride containing X architecture in argon atmosphere) it is dissolved in N- methyl
Pyrrolidones, dimethyl sulfoxide, dimethyl sulfone, sulfolane, Isosorbide-5-Nitrae-dioxane, n,N-dimethylacetamide, N, N- dimethyl
In one of formamide, metacresol, tetrahydrofuran or the highly polar aprotic organic solvent of more than one mixing, contain Y structure
Diamines and the dianhydride gross mass containing X architecture account for the 0.5~30% of reaction mass gross mass, be stirred to react 0.5 at -10~55 DEG C
~90h obtains homogeneous ultrabranching polyamide acid solution, and passes through hot-imide or chemistry to ultrabranching polyamide acid glue
Imidizate is dehydrated to obtain super-branched polyimide material.
The concrete operation step of the hot-imide method are as follows: on a glass by ultrabranching polyamide acid glue blade coating,
Glass plate is placed in vacuum drying oven again, is vacuumized, temperature program are as follows: room temperature to the entire mistake of constant temperature after 80 DEG C~120 DEG C
0.8~3h of journey, constant temperature 0.8~2h of whole process, is finally warming up to 300 DEG C~400 after being warming up to 150 DEG C~200 DEG C again later
0.8~2h of constant temperature whole process after DEG C can be taken off super-branched polyimide film or powder after cooling.
The concrete operation step of the chemical imidization method are as follows: in ultrabranching polyamide acid solution liquid be added pyridine/
As dehydrating agent, heating stirring is heated to 40~170 DEG C of continuation for acetic anhydride or triethylamine/acetic anhydride or sodium acetate/acetic anhydride
Stirring 4~for 24 hours, it is poured into after being cooled to room temperature in methanol or ethyl alcohol and obtains super-branched polyimide precipitating, be filtered, washed, dry,
Super-branched polyimide powder is obtained, if you need to prepare membrane material, then polyimides powder can be dissolved in N-Methyl pyrrolidone
(NMP), dimethyl sulfoxide (DMSO), n,N-dimethylacetamide (DMAc), n,N-Dimethylformamide (DMF), metacresol (m-
Cresol it) or in tetrahydrofuran (THF), is heated to after being completely dissolved, on a glass by polyimide solution blade coating, 70~
200 DEG C of vacuum drying remove solvent, can be taken off polyimide film after cooling.
A kind of preparation method of the aromatic series super-branched polyimide proposed is invented, preparation process is simple and various, item
Part requirement is low, thus is suitable for industrial production.The present invention introduces multiple rigid aromatic structures in super-branched polyimide main chain, and one
The heat resistance of polymer can be improved in aspect, on the other hand, since multiple rigid aromatic structures are introduced into hyperbranched polyamides Asia
Amine main chain can expand the distance between polymer chain, increase the free volume of polymer, further improve its dissolubility and add
Work performance improves its gas permeability.Super-branched polyimide of the present invention has high glass-transition temperature and heat steady simultaneously
It is qualitative, lower thermal expansion coefficient and excellent solubility property, in the materials such as high temperature resistant field and gas permeability and separation film
Material field is with good application prospect.
Detailed description of the invention
Fig. 1 is the infrared spectrogram of Examples 1 to 7 super-branched polyimide, in which:
A corresponding embodiment 3
B corresponding embodiment 5
C corresponding embodiment 1
D corresponding embodiment 2
E corresponding embodiment 4
F corresponding embodiment 6
G corresponding embodiment 7
It can see from infrared spectrogram, in 1781 and 1716cm-1It is nearby the asymmetric and right of carbonyl on imide ring
Claim stretching vibration, in 1360cm-1There is apparent C-N key stretching vibration characteristic absorption peak in place, these all illustrate Examples 1 to 7
All successfully synthesize.
Specific embodiment
Example is given below so that the present invention will be described in more detail, it is necessary to be pointed out that following embodiment cannot be explained
For the limitation to invention protection scope, the person skilled in the art in the field makes the present invention according to foregoing invention content some
Nonessential modifications and adaptations should belong to the scope of protection of the present invention.
Embodiment 1
Three mouthfuls of burnings are added in pyromellitic acid anhydride (PMDA) 0.4362g (2mmol) and N,N-dimethylformamide 36ml
In bottle, it is passed through argon gas, is warming up to 30 DEG C, by Triamine monomer 4,4 "-diamino-5'- (4-aminophenyl)-[1,1':3',
1 "-terphenyl] -2'-ol 0.3674g (1mmol) is dissolved into 40ml N,N-dimethylformamide constant pressure funnel and exists
1~2h is dropped evenly in three-necked flask, then proceedes to reaction 16h, 6ml acetic anhydride and 2ml triethylamine is then added, is warming up to
45 DEG C of the reaction was continued 12h, reaction terminate to discharge in ethanol after being cooled to room temperature, filter, washing repeats 2~3 times, most postposition
Drying for 24 hours, obtains filemot super-branched polyimide polymer, structural formula is as follows in 80 DEG C of vacuum ovens:
Embodiment 2
Pyromellitic acid anhydride (PMDA) 0.4515g (2.07mmol) and DMAC N,N' dimethyl acetamide 15ml is added three mouthfuls
In flask, be passed through argon gas, be warming up to 30 DEG C, by Triamine monomer 5,5', 5 "-(benzene-1,3,5-triyl) tris
(thiophen-2-amine) 0.3695g (1mmol) is dissolved into 16ml DMAC N,N' dimethyl acetamide constant pressure funnel 1
~2h is dropped evenly in three-necked flask, then proceedes to reaction 14h, 6.2ml acetic anhydride and 2.1ml triethylamine is then added, rise
To 45 DEG C of the reaction was continued 14h, reaction terminates to discharge in ethanol after being cooled to room temperature temperature, filters, washing, repeats 2~3 times, most
It is placed on drying in 80 DEG C of vacuum ovens and for 24 hours, obtains lurid super-branched polyimide polymer, structural formula is as follows:
Embodiment 3
By 3,3', 4,4'-- bibenzene tetracarboxylic dianhydride (BPDA) 0.4413g (1.5mmol) and N-Methyl pyrrolidone 10ml
It is added in three-necked flask, is passed through argon gas, is warming up to 30 DEG C, by the "-diamino-5'- (4-aminophenyl)-of Triamine monomer 4,4
[1,1':3', 1 "-terphenyl] -2'-thiol 0.3835g (1mmol) is dissolved into 8ml N-Methyl pyrrolidone constant pressure
Dropping funel drops evenly in three-necked flask in 1~2h, then proceedes to reaction 26h, 12ml acetic anhydride and 3ml tri- is then added
Ethamine is warming up to 45 DEG C the reaction was continued 18h, and reaction terminates to discharge in methyl alcohol after being cooled to room temperature, filter, washing, repeat 2~
It 3 times, is finally placed in drying in 80 DEG C of vacuum ovens and for 24 hours, obtains the super-branched polyimide polymer of reddish brown, structure
Formula is as follows:
Embodiment 4
6,6', 6 "-(benzene-1,3,5-triyl) tris (naphthalen-2-amine) 1.0032g (2mmol) and
N,N-Dimethylformamide 8ml is added in three-necked flask, is passed through argon gas, is warming up to 30 DEG C, by 3,3', 4,4'- benzophenone tetracids
Dianhydride (BTDA) 0.6444g (2mmol) is dissolved into 8ml N,N-dimethylformamide uniform in 1~2h with constant pressure funnel
It is added dropwise in three-necked flask, then proceedes to reaction 16h.Gained super-branched polyimide acid glue is scratched into the glass in dried and clean
In glass plate, then glass plate is placed in vacuum drying oven, vacuumized, 80 lower dry 3h, the entire mistake of constant temperature after then raising temperature to 120 DEG C
Journey 2h, from 120 DEG C be warming up to 200 DEG C after constant temperature whole process 2h, 350 DEG C of constant temperature whole process 1h are warming up to from 200 DEG C, it is cold
But, super-branched polyimide film is taken out, structural formula is as follows:
Embodiment 5
N,N'-(5'-(4-(4-aminobenzamido)phenyl)-[1,1':3',1″-terphenyl]-4,4″-
Diyl) bis (4-aminobenza mide) 1.4176g (2mmol) and n,N-dimethylacetamide 5ml is added in three-necked flask,
It is passed through argon gas, is warming up to 30 DEG C, hexafluorodianhydride (6FDA) (6FDA) 0.8618g (1.94mmol) is dissolved into 5.5ml N, N- dimethyl second
It is dropped evenly in three-necked flask with constant pressure funnel in 1~2h in amide, then proceedes to reaction 20h, 6ml second is then added
Acid anhydrides and 2ml triethylamine are warming up to 45 DEG C the reaction was continued 14h, and reaction terminates to discharge in methyl alcohol after being cooled to room temperature, and filtering is washed
It washs, repeats 2~3 times, be finally placed in drying in 80 DEG C of vacuum ovens and for 24 hours, obtain super-branched polyimide polymerization russet
Object, structural formula are as follows:
Embodiment 6
4'-(3-aminophenyl)-[1,1':2',1″-terphenyl]-3,3″-diamine 0.3515g(1mmol)
It is added in three-necked flask with n,N-dimethylacetamide 50ml, is passed through argon gas, is warming up to 30 DEG C, by diphenyl ether tetraformic dianhydride
(ODPA) 0.2482g (0.8mmol) is dissolved into 50ml DMAC N,N' dimethyl acetamide uniform in 1~2h with constant pressure funnel
It is added dropwise in three-necked flask, then proceedes to reaction 20h.Gained super-branched polyimide acid glue is scratched into the glass in dried and clean
In glass plate, then glass plate is placed in vacuum drying oven, vacuumized, 80 lower dry 3h, the entire mistake of constant temperature after then raising temperature to 120 DEG C
Journey 2h, from 120 DEG C be warming up to 200 DEG C after constant temperature whole process 2h, 350 DEG C of constant temperature whole process 1h are warming up to from 200 DEG C, it is cold
But, super-branched polyimide film is taken out, structural formula is as follows:
Embodiment 7
7,7',7″-(benzene-1,3,5-triyl)tris(2-amino-9H-fluoren-9-one)0.6578g
(1mmol) and tetrahydrofuran 2ml are added in three-necked flask, are passed through argon gas, are warming up to 30 DEG C, by cyclobutanetetracarboxylic dianhydride
(CBDA) 0.2353g (1.2mmol) is dissolved into 1.5ml tetrahydrofuran is dropped evenly in 1~2h into three with constant pressure funnel
In mouth flask, reaction 18h is then proceeded to.By gained super-branched polyimide acid glue blade coating on the glass plate of dried and clean,
Glass plate is placed in vacuum drying oven again, is vacuumized, 80 lower dry 3h, constant temperature whole process 2h after then raising temperature to 120 DEG C, from
120 DEG C be warming up to 200 DEG C after constant temperature whole process 2h, be warming up to 350 DEG C of constant temperature whole process 1h from 200 DEG C, it is cooling, take out it is super
Branched polyimide film, structural formula are as follows:
Using the differential scanning calorimeter (DSC204) of Nai Chi company and the thermogravimetric analyzer (Q50) of TA company respectively to reality
It applies super-branched polyimide prepared by example 1~7 and carries out glass transition temperature (Tg) and the survey of 5% thermal weight loss temperature (T5%)
Examination, test result is as shown in table 1, and the solubility property data of super-branched polyimide are as shown in table 2.
The hot property of 1 super-branched polyimide of table
The dissolubility of 2 super-branched polyimide of table
Note: ++ representing room temperature can be completely dissolved
As can be seen from Table 1 and Table 2, super-branched polyimide of the present invention has high glass-transition temperature and thermostabilization
Property, excellent dissolubility.