Molecular aggregation and mechanical properties of Kapton H

Molecular aggregation of Kapton H (KH) was investigated by small‐angle x‐ray scattering (SAXS). Superstructure parameters were estimated using a one‐dimensional model, taking into account that the SAXS from KH is anisotropic out of the film plane. The results show that KH has a two‐phase structure with a volume ratio of the ordered to the less‐ordered phase of about 1:1. The β dispersion in dynamic mechanical properties is reasonably ascribed to oscillations of p‐phenylene groups in the main chain.