The thermal degradation behaviour of polydimethylsiloxane/montmorillonite nanocomposites
The thermal degradation behaviour of polydimethylsiloxane/montmorillonite nanocomposites
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DOI：
10.1016/j.polymdegradstab.2009.04.030
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发表时间：
2009-09-01
影响因子：
5.9
通讯作者：
Patel, Mogon
中科院分区：
文献类型：
--
作者：
Lewicki, James P.;Liggat, John J.;Patel, Mogon
制备了一系列新型聚二甲基硅氧烷/蒙脱土(PDMS/MMT)纳米复合材料。通过热挥发分析(TVA)和热重分析(TGA)研究了这些纳米复合材料的热降解行为。主要降解产物为D-3~D-7的环状低聚硅氧烷。和较高的低聚硅氧烷残留量。其他轻微降解产物包括甲烷、双五甲基环三硅氧烷、丙烯、丙醛、苯和二甲基硅酮。结果表明，纳米粘土显著改变了PDMS网络的降解行为，改变了热降解的轮廓，降低了挥发分的总析出速率。结果还表明，纳米粘土通过诱导低水平的自由基链断裂来促进二甲基硅酮和苯的形成。(C)2009爱思唯尔有限公司。保留所有权利。
A series of novel polydimethylsiloxane/montmorillonite (PDMS/MMT) nanocomposites was prepared. The thermal degradation behaviour of these nanocomposites was studied by means of Thermal Volatilization Analysis (TVA) and Thermogravimetric Analysis (TGA). The major degradation products were identified as cyclic oligomeric siloxanes from D-3 to D-7. and higher oligomeric siloxane residues. Other minor degradation products include methane, bis-pentamethylcyclotrisiloxane, propene, propanal, benzene and dimethylsilanone. The results demonstrate that the nanoclay significantly alters the degradation behaviour of the PDMS network, modifying the profile of the thermal degradation and reducing the overall rate of volatiles evolution. The results also indicate that the nanoclay promotes the formation of dimethylsilanone and benzene by inducing low levels of radical chain scission. (c) 2009 Elsevier Ltd. All rights reserved.