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Fourier transform infrared studies on the thermal degradation of polyvinylimidazoles. Part II
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.1986.070320524
Subject(s) - degradation (telecommunications) , polymer , evaporation , fourier transform infrared spectroscopy , materials science , infrared , polymer degradation , polymer chemistry , chemistry , chemical engineering , composite material , optics , computer science , thermodynamics , telecommunications , physics , engineering
Oxidative thermal degradation of polyvinylimidazoles on copper have been studied. Degraded products include olefinic, saturated, and α,β‐unsaturated ketones, α,β‐unsaturated and β‐iminonitriles, CN conjugated and NHCC components. At 150°C, the rate of degradation of the polymers is relatively slow. For PVI(1), approximately 50% of the polymer remained nonoxidized after 64 h of heating, whereas 80% of PVI(4) remained nonoxidized after 47 h of heat treatment. At 210°C, the degradation mechanisms involved three stages, with the duration of each stage quite different between the two polymers. No degradation of polyvinylimidazoles is observed in vacuum initially at 400°C. Prolonged heat treatment leads to evaporation of residual water, further complex formation, and, finally, evaporation of the polymer films.