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Relaxation Behavior of Thermoplastic Polyimide R-BAPB in the Amorphous State

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Abstract

The molecular mobility of poly(4,4'-bis(4-aminophenoxy)biphenyl)imido-1,3-bis(3,3'-4,4'-dicarboxyphenoxy)benzene) films is studied by the thermally stimulated depolarization current (TSDC) technique and dielectric spectroscopy. The existence of two dipolar polarization relaxation regions (β and α) related to the local mobility in the glassy state and the cooperative segmental mobility in the rubbery state, respectively, is revealed. The temperature dependences of the relaxation time for the β-process obey the Arrhenius equation; for the α-process, they obey the Vogel–Tammann–Hesse equation. Emergence of the third peak βI is related to relaxation of the space homocharge. The molecular mechanisms of all the observed processes are revealed.

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Correspondence to A. M. Kamalov.

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Translated by T. Soboleva

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Kamalov, A.M., Borisova, M.E., Didenko, A.L. et al. Relaxation Behavior of Thermoplastic Polyimide R-BAPB in the Amorphous State. Polym. Sci. Ser. A 62, 107–115 (2020). https://doi.org/10.1134/S0965545X20010058

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  • DOI: https://doi.org/10.1134/S0965545X20010058

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