Thermal degradation and kinetic analysis of biodegradable PBS/multiwalled carbon nanotube nanocomposites
Thermal degradation and kinetic analysis of biodegradable PBS/multiwalled carbon nanotube nanocomposites
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DOI：
10.1002/polb.21728
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发表时间：
2009-07
期刊：
影响因子：
--
通讯作者：
Y. Shih
中科院分区：
文献类型：
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作者：
Y. Shih
本研究首先用N，N‘-二环己基碳二亚胺(DCC)脱水剂对碳纳米管(CNTs)进行了改性。随后，采用熔融共混法制备了聚丁二酸丁二醇酯/多壁碳纳米管(PBS/MWNTs)纳米复合材料。研究了PbS/MWNT纳米复合材料的热降解行为，分别用Coats和Redfern、Ozawa和Horowitz和Metzger方法计算了降解动力学参数。结果表明，PbS与含CNT-C18的纳米复合材料在较低温度下的降解反应机理可能是通过无规断链(顺式消除)反应生成F1模型。但在较高温度下，由于主要的扩散控制作用，反应机理很可能是D_1模型。此外，在不同的升温速率下，含CNT-C18的PbS纳米复合材料的活化能随CNT-C18含量的增加而先增大，但在大于0.5wt%后又降低。这可能是因为当碳纳米管含量较高时，碳纳米管在聚合物基质中形成了导电网络，从而导致了更好的导热和导电性。
In this study, carbon nanotubes (CNTs) were first modified using N,N'-dicyclonexylcarbodiimide (DCC) denydrating agents. Subsequently, the poly(butylene succinate)/multiwalled carbon nanotube (PBS/MWNTs) nanocomposites were prepared through facile melt blending. Thermal degradation of these PBS/MWNT nanocomposites was investigated; the kinetic parameters of degradation were calculated using the Coats and Redfern, Ozawa, and Horowitz and Metzger methods, respectively. It was found that the degradation reaction mechanism of PBS and the CNT- C18 containing nanocomposites at lower temperature was likely to produce an F1 model through reaction of random chain cleavage (cis-elimination). However, the reaction mechanism at higher temperature was likely to be a D1 model because of the dominant diffusion control effect. Moreover, it was found that the activation energies of CNT-C18-containing PBS nanocomposites were first increased with the content of CNT-C18, but then decreased after the content was larger than 0.5 wt % for all models at differing heating rates. This may be due to the formation of a conductive network of CNTs in the polymer matrix at higher content of CNTs, which lead to better heat and electrical conductivity.