Patent ID: 11879039
Assignee: HARBIN ENGINEERING UNIVERSITY
Field: Macromolecular chemistry, polymers (Chemistry)
Classification: CPC C | IPC C

Claim 0:
1. A preparation method for a thermoplastic multi-hybrid polyimide film, comprising the following steps:
S1, adding an aromatic diisocyanate to an aromatic dianhydride solution system according to a molar ratio of anhydride to isocyanate of 1.05:1-1.10:1, and stirring in a nitrogen atmosphere for a first reaction for 8-12 h to obtain an anhydride-terminated polyimide precursor solution containing a seven-membered ring structure named a first solution, where in a weight percentage of an anhydride-terminated polyimide precursor containing the seven-membered ring structure of the first solution is 15%-25%;
S2, adding an aromatic dianhydride to an aromatic diamine solution system according to a molar ratio of diamine to anhydride of 1.04:1-1.08:1, stirring for a second reaction for 4-8 h to obtain an amino-terminated polyamic acid solution named a second solution; wherein a weight percentage of an amino-terminated polyamic acid in the second solution is 15%-25%,
S3, mixing the first solution and the second solution according to a weight ratio of 1:1.6-1:3.2 for a third reaction for 10-20 min to obtain a multi-polymerization solution;
S4, after extending the multi-polymerization solution to form a film, carrying out a gradient heating curing in a vacuum oven and an ordinary oven respectively, and cooling to obtain the thermoplastic multi-hybrid polyimide film.