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Dielectric behavior and resistivities of polyacrylonitrile and some pyrolyzates
Author(s) -
Van Beek L. K. H.
Publication year - 1965
Publication title -
journal of applied polymer science
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.575
H-Index - 166
eISSN - 1097-4628
pISSN - 0021-8995
DOI - 10.1002/app.1965.070090217
Subject(s) - polyacrylonitrile , pyrolysis , conductivity , dielectric , polymer , dielectric loss , nitrogen , materials science , atmosphere (unit) , polymer chemistry , hydrogen , conjugated system , electrical resistivity and conductivity , chemical engineering , chemistry , organic chemistry , composite material , optoelectronics , meteorology , electrical engineering , physics , engineering
Dielectric losses in polyacrylonitrile (PAN) and three pyrolyzates were studied between 1 Hz. and 300 kHz. Pure PAN has at 20°C. a very broad loss region with a maximum at 70 Hz. which is ascribed to CN groups. Powdered PAN was pyrolyzed in a nitrogen atmosphere at 170, 220, and 300°C. PAN‐170 has the same loss maximum as the unpyrolyzed polymer, but the maximum had disappeared in PAN‐220. This is attributed to formation of conjugated chains by linking of CN groups above 200°C. However, this does not enhance the conductivity until hydrogen is eliminated above 350°C.