کد مقاله | کد نشریه | سال انتشار | مقاله انگلیسی | نسخه تمام متن |
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1448033 | 988662 | 2009 | 9 صفحه PDF | دانلود رایگان |
Compatibility via chemical coupling between electron-modified polytetrafluoroethylene (PTFE) powder and poly-2-chlorobutadiene rubber is accomplished by activation of the radiation-induced carboxylic groups on the PTFE surface by zinc oxide. This is achieved both prior to and during reactive blending of zinc oxide with chloroprene rubber. Spectroscopic analysis of the reaction products reveals an increase in characteristic chloroprene absorption (≈1660 cm−1) due to the stretching of the CC bond. Microscopic observations suggest that the PTFE dispersion is considerably improved, while the state of interphase between the PTFE particles and the chloroprene rubber indicates enhanced compatibility. The increase in the cross-link density determined by Mooney–Rivlin plots provides indirect evidence for the existence of chemical coupling. PTFE-based chloroprene composite exhibits a significant increase in modulus due to the strong reinforcement effect of the modified PTFE powder. Finally, we propose an explanation of the coupling mechanism based on the chemical activation of carboxylic groups in the PTFE powder in the presence of zinc oxide.
Journal: Acta Materialia - Volume 57, Issue 16, September 2009, Pages 4882–4890