A method that improves the performance of the film through cross -linking
A film and performance technology, applied in the field of improving film performance, can solve the problems of chemical stability and mechanical properties of polyimide films, such as insufficient thermal expansion resistance, and achieve clear conception, tear resistance and thermal expansion resistance. boosted effect
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Embodiment 1
[0036] A method for improving film performance through cross-linking. The cross-linking agent is introduced into the molecular chain of polyimide by means of copolymerization, and the cross-linking agent is induced to cross-link during the film-forming process of the polyimide; wherein, the cross-linking agent is cross-linked. The structural formula of the joint agent is:
[0037]
[0038]The copolymerization process is as follows: firstly, TMAc, diamine and cross-linking agent in a molar ratio of 100:98:2 are mixed, reacted at a temperature of 0 °C for 1 h, then reacted at a temperature of 25 °C for 3 h, and then reacted to the reaction Pyridine and acetic anhydride were added to the system and reacted for 24 hours. Finally, the obtained product was separated out in isopropanol solution, pulverized, washed with isopropanol for 3 times, and dried under vacuum to obtain white powder, in which pyridine and acetic anhydride were mixed. The molar addition amount is 2 times and ...
Embodiment 2
[0046] A method for improving film performance through cross-linking. The cross-linking agent is introduced into the molecular chain of polyimide by means of copolymerization, and the cross-linking agent is induced to cross-link during the film-forming process of the polyimide; wherein, the cross-linking agent is cross-linked. The structural formula of the joint agent is:
[0047]
[0048] The copolymerization process is as follows: firstly, TMAc, diamine and cross-linking agent in a molar ratio of 100:92:8 are mixed, reacted at a temperature of 2 °C for 2 h, then reacted at a temperature of 28 °C for 2 h, and then reacted to the reaction Pyridine and acetic anhydride were added to the system and reacted for 20 hours. Finally, the obtained product was precipitated in isopropanol solution, pulverized, washed three times with isopropanol, and dried in vacuum to obtain a white powder, in which pyridine and acetic anhydride were mixed. The molar addition is 2 times and 6 times ...
Embodiment 3
[0053] A method for improving film performance through cross-linking. The cross-linking agent is introduced into the molecular chain of polyimide by means of copolymerization, and the cross-linking agent is induced to cross-link during the film-forming process of the polyimide; wherein, the cross-linking agent is cross-linked. The structural formula of the joint agent is:
[0054]
[0055] The copolymerization process is as follows: firstly, the molar ratio of TMAc, diamine and cross-linking agent is mixed, and the reaction is carried out at a temperature of 3 °C for 1 h, then at a temperature of 30 °C for 1 h, and then to the reaction Pyridine and acetic anhydride were added to the system to react for 12 hours, and finally the obtained product was precipitated in isopropanol solution, pulverized, washed with isopropanol for 5 times, and vacuum-dried to obtain a white powder, in which pyridine and acetic anhydride were mixed. The molar addition is 1 and 3 times the molar ad...
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