Effect of Crystallinity on Relaxation Losses in Polyimide R-BAPS Films

The effect of the degree of crystallinity on relaxation processes in poly((4,4'-bis(4-aminophenoxy) biphenyl)imido-1,3-bis(3,3'-4,4'-dicarboxyphenoxy)benzene) films is studied by thermoactivation spectroscopy and dynamic mechanical analysis. Using thermoactivation spectroscopy, it shown that the β transition is caused by the dipole-group relaxation of polyimide, the β' transition is related to the breakdown of spatial charge, and the α...