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Citation:
MA Peng-Chang, YANG Zheng-Huaa, JI Xiang-Linga, DING Meng-Xiana. Unistretched Polyimide Films[J]. Chinese Journal of Applied Chemistry,
;2007, 24(3): 331-334.
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PMDA/ODA and BPDA/PPD based polyimide films prepared from polyamic acid solution(PAA method) and partly imidized polyamic acid solution(gel method) were investigated. The self-supported film with the gel method had lower solid content than that with the PAA method, and the film with lower solid content could be unistretched at higher ratio, hence make the film lower coefficient of thermal expansion(CTE)(for PMDA/ODA decreased from 35.1×10-6/℃ to 12.5×10-6/℃), higher tensile strength as well as modulus(for PMDA/ODA they were 236 MPa and 1.7 GPa, respectively; for BPDA/PPD they were 613 MPa and 9.3 GPa, respectively), but lower elongation. The CTE and elongation of the films determined in machine direction were lower than those in transversal direction, but the strength and modulus in machine direction were much higher than those in transversal direction.
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Keywords:
- polyimide,
- film,
- unistretching
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