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Fourier transform infrared studies on the thermal degradation of polyvinylimidazoles: Part I
Author(s) -
Eng Frederick P.,
Ishida Hatsuo
Publication year - 1986
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.1986.070320523
Subject(s) - polyacrylonitrile , dehydrogenation , degradation (telecommunications) , fourier transform infrared spectroscopy , potassium bromide , chemistry , infrared , polymer chemistry , cleavage (geology) , bond cleavage , polymer , organic chemistry , photochemistry , materials science , chemical engineering , composite material , telecommunications , fracture (geology) , computer science , engineering , catalysis , physics , optics
Thermal degradation of polyvinylimidazoles on potassium bromide plate has been studied. At 300°C heat treatment, the occurrence of oxidation and dehydrogenation leads to the formation of saturated ketones and unconjugated CC bonds in the polymer backbone, respectively. The combination of the two types of reactions also yields α,β‐unsaturated keto compounds. Then at prolonged heat treatment at 300°C, cleavage of imidazole rings also occurs and α,β‐unsaturated cyano structures are formed. At 400°C, a new class of compound, carbodiimides, is being produced while the amount of the α,β‐unsaturated cyano compounds is greatly reduced. Similar to polyacrylonitrile, ladder‐type structures for degraded PVI(1) and PVI(4) are proposed probable.