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The degradation of an aromatic polyamideimide in an NO 2 atmosphere
Author(s) -
Kambe Hirotaro,
Yokota Rikio
Publication year - 1980
Publication title -
polymer engineering and science
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.503
H-Index - 111
eISSN - 1548-2634
pISSN - 0032-3888
DOI - 10.1002/pen.760201012
Subject(s) - materials science , degradation (telecommunications) , glass transition , diffusion , solvent , gel permeation chromatography , atmosphere (unit) , analytical chemistry (journal) , absorption (acoustics) , dynamic mechanical analysis , infrared spectroscopy , ultimate tensile strength , chemical engineering , composite material , polymer , chromatography , organic chemistry , chemistry , thermodynamics , telecommunications , physics , computer science , engineering
Films of an aromatic polyamideimide showed a significant degradation in an NO 2 atmosphere at 100 mm Hg at 50°C. The degradation was followed by the dynamic tensile measurements. In the curves of temperature dependence of dynamic loss modulus of degraded films, a separate mechanical absorption α′ peak appeared below the glass transition α peak. In the course of degradation, the α′ peak grew and shifted to lower temperature. On thermal treatment of degraded films, the α′ peak shifted to higher temperature and finally merged into the α peak. The formation of reacted surface layers by the diffusion of NO 2 was confirmed by scraping off and by solvent extraction. Infrared spectroscopy showed that most amide linkages were destroyed by NO 2 . The gel permeation chromatography of extracted products showed that the low molecular products were occluded in degraded layers. The influence of these components caused the α′ absorption in dynamic loss curves.