Correlation of chemical and mechanical property changes during oxidative degradation of neoprene

被引:147
作者
Celina, M
Wise, J
Ottesen, DK
Gillen, KT
Clough, RL
机构
[1] Sandia Natl Labs, Albuquerque, NM 87185 USA
[2] Sandia Natl Labs, Livermore, CA 94551 USA
关键词
thermal polymer degradation; rubber aging; heterogeneous degradation; FTIR-microscopy; oxygen consumption; modulus profiling; degradation profiles; carbonyl profiles; neoprene; oxygen diffusion effects;
D O I
10.1016/S0141-3910(99)00183-4
中图分类号
O63 [高分子化学(高聚物)];
学科分类号
070305 ; 080501 ; 081704 ;
摘要
The thermal degradation of a commercial, stabilized, unfilled neoprene (chloroprene) rubber was investigated at temperatures up to 140 degrees C. The degradation of this material is dominated by oxidation rather than dehydrochlorination. Important heterogeneous oxidation effects were observed at the various temperatures investigated using infrared micro-spectroscopy and modulus profiling. Intensive degradation-related spectral changes in the IR occurred in the conjugated carbonyl and hydroxyl regions. Quantitative analysis revealed some differences in the development of the IR oxidation profiles, particularly towards the sample surface. These chemical degradation profiles were compared with modulus profiles (mechanical properties). It is concluded that the profile development is fundamentally described by a diffusion-limited autoxidation mechanism. Oxygen consumption measurements showed that the oxidation rates display non-Arrhenius behavior (curvature) at low temperatures. The current results, when compared to those of a previously studied, clay-filled commercial neoprene formulation, indicate that the clay filler acts as an antioxidant, but only at low temperatures. (C) 2000 Elsevier Science Ltd. All rights reserved.
引用
收藏
页码:171 / 184
页数:14
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