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Effects of medium phases on the thermal degradation of hydrogenated nitrile rubber O‐rings under compression
Author(s) -
Lou Weitao,
Zhang Weifang,
Liu Xuerong,
Lou Taishan,
Xu Dan
Publication year - 2018
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.45864
Subject(s) - compression set , fourier transform infrared spectroscopy , materials science , ultimate tensile strength , composite material , nitrile rubber , degradation (telecommunications) , natural rubber , elongation , attenuated total reflection , nitrile , polymer chemistry , chemical engineering , chemistry , organic chemistry , telecommunications , computer science , engineering
The degradation of hydrogenated nitrile rubber O‐rings under exposure to either air or hydraulic oil under compression were investigated at elevated temperatures. The physical and chemical changes of the samples aged for various durations were studied by measuring the weight, compression set, tensile strength, elongation at break, crosslinking density, fracture morphology, and attenuated total reflection–Fourier transform infrared (ATR–FTIR) spectroscopy. The results indicate that the weight decreased with exposure time and temperature and that weight loss was greater in oil. Crosslinking and chain scission both occurred during the aging process. The significant changes in the mechanical properties indicate that more severe degradation occurs in air. The fracture morphologies results show that the fracture surfaces aged in oil become rougher and have more defects. The ATR–FTIR results demonstrate that the hydroxyl groups were formed in air and oil, while carboxyl groups were only generated in air. © 2017 Wiley Periodicals, Inc. J. Appl. Polym. Sci. 2018 , 135 , 45864.