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It is stressed that the structure plays a decisive role on the property of materials. Materials generally with rigid molecular chains possess outstanding mechanical performances. However, this structure-property relationship is ambiguous in some polyimide (PI) materials. In this study, three typical homo-PI fibers, derived from pyromellitic dianhydride(PMDA)/p-phenylene diamine(PDA), PMDA/4,4′-oxidianiline...
The correlation between mechanical property and the microstructure of two-step wet spinning polyimide (PI) fibers after thermal annealing was investigated. In-situ wide-angle X-ray diffraction (WAXD) and ex-situ small angle X-ray scattering (SAXS) methods were utilized to study the liquid crystal-like structure orientation and microvoids structure (the length and the orientation angle of microvoids)...
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