Abstract
AbstractThe structure and miscibility of polyimide PBPI‐E/PTI‐E blends were studied by wide‐ and small‐angle X‐ray scattering and dynamic mechanical analysis, where PBPI‐E is a biphenyldianhydride‐based polyimide, and PTI‐E is a polyimide from 4,4′‐thiodiphthalic anhydride and 4,4′‐oxydianiline. The results obtained show that there exists a paracrystalline structure in the blends with high content of PBPI‐E, but this does not affect the miscibility of the blends. The blends are miscible over the entire composition range, since only one Tg was observed for each blend. Meanwhile, the segregation of PTI‐E during crystallization of PBPI‐E in the blends is interlamellar.
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