Enhanced thermal stability of polychloroprene rubber composites with ionic liquid modified MWCNTs

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• 作者：Kalaivani Subramaniam^a ; Amit Das^a ; ^das@ipfdd.de ; Liane H&#228 ; uß ; ler^a ; Christina Harnisch^a ; Klaus Werner Stö ; ckelhuber^a ; Gert Heinrich^a ; ^b
• 关键词：Polychloroprene rubber ; Thermal degradation ; Carbon nanotubes ; Ionic liquids ; Elastomeric composites ; Thermal stability
• 刊名：Polymer Degradation and Stability
• 出版年：2012
• 期刊代码：85_01413910
• 类别：ms
• 出版时间：May, 2012
• 卷：97
• 期：5
• 页码：776-785
• 文件大小：1796 K

摘要

Thermal degradation of polychloroprene rubber (CR) composites based on unmodified and ionic liquid modified multi-walled carbon nanotubes (MWCNTs) is studied using thermogravimetric analysis (TGA) in aerobic and anaerobic (nitrogen) conditions. The CR and its composites exhibit three stage and four stage degradation in nitrogen and air respectively. The presence of unmodified CNTs alone does not improve the thermal stability of composites to a great extent whereas a reasonable enhancement is observed in case of modified CNTs/CR composites which can be attributed to the interfacial interactions of ionic liquid/modified tubes with CR and to the fine dispersion of modified tubes in CR. The degradation products of CR and its composites were analysed using pyrolysis-gas chromatography-mass spectrometry (Py-GC-MS) and the mechanism of degradation is discussed. Non-isothermal degradation kinetics were studied using Kissinger and Flynn-Wall-Ozawa methods and the activation energy of thermal decomposition is found to be high for modified CNTs/CR composites. Isothermal degradation of modified CNTs/CR composites at 290聽掳C for 30聽min in nitrogen reveals decreased weight loss (14%) as opposed to CR (31%) and unmodified CNTs/CR composites (30%). The combustion behaviour of the composites was dealt using microscale combustion calorimeter (MCC) and the flame retardancy of the composites is discussed.