The study on imidization degree of polyamic acid in solution and ordering degree of its polyimide film |
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Authors: | Yan Zhai Qin Yang Rongqi Zhu Yi Gu |
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Affiliation: | (1) State Key Laboratory of Polymeric Materials Engineering, College of Polymer Science and Engineering, Sichuan University, Chengdu, 610065, China;(2) Department of Materials Engineering, College of North University of China, Taiyuan, 030008, China |
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Abstract: | Polyamic acid (PAA) based on pyromellitic dianhydride and 4,4′-oxydianiline (PMDA–ODA) can be chemically converted to copolyamic acid-imide (PA-I) which is a partially converted PAA at ambient temperature by treatment with a mixture of acetic anhydride and pyridine. A systematic investigation by rotation viscometer and FT-IR revealed that phase separation in PA-I solution occurred when imidization degree was about 26%. Imidization degree of PA-I solution could be controlled by using adequate acetic anhydride amount, initial PAA concentration and imidization time. PA-I solutions with different imidization degree were converted to corresponding polyimide films by thermal imidization. WAXD showed that as imidization degree in PA-I solution increased, the degree of morphologic ordering of final PI film was improved, while tensile strength and modulus increased and ultimate elongation reduced slightly. |
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