Molecular transport of aromatic solvents through microcomposites of natural rubber (NR), carboxylated styrene butadiene rubber (XSBR) and their blends
Molecular transport of aromatic solvents through microcomposites of natural rubber (NR), carboxylated styrene butadiene rubber (XSBR) and their blends
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DOI：
10.1016/j.compscitech.2006.05.009
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发表时间：
2007-05
影响因子：
9.1
通讯作者：
R. Stephen;K. Joseph;Z. Oommen;Sabu Thomas
中科院分区：
文献类型：
--
作者：
R. Stephen;K. Joseph;Z. Oommen;Sabu Thomas
研究了苯、甲苯和对二甲苯等芳烃类溶剂在微米级填料增强天然橡胶、羧基丁苯橡胶及其70/30共混胶乳膜中的传输性能。研究了渗透剂粒度、填料含量和温度对扩散性能的影响。通过扫描电镜照片分析了填料在基体中的分散情况。由于聚合物/填料相互作用的缺乏，填料在NR中的聚集更高。填充后的样品由于路径的曲折性而表现出较低的溶胀率，扩散系数也有明显的降低。然而，由于两种组分的不相容性，共混体系表现出意想不到的扩散行为。渗透剂扩散的活化能由Arrhenius图计算。渗透剂扩散所需的活化能被认为是较高的填充原生聚合物。的运输机制进行了调查，发现所有系统表现出非Fickian异常行为。
Transport properties of aromatic solvents such as benzene, toluene and p-xylene through micron sized fillers reinforced natural rubber, carboxylated styrene butadiene rubber and their 70/30 blend latex membranes were investigated. The effect of penetrant size, filler loading and temperature on the diffusion properties were studied. The dispersion of filler in the matrix were analysed from scanning electron micrographs. Due to the lack of polymer/filler interaction aggregation of filler was higher in NR. The filled samples showed reduced swelling rate owing to the tortuosity of the path. A dramatic decrease in diffusion coefficient of filled samples was observed. However, blend system exhibited unexpected diffusion behaviour because of the immiscibility of the two components. The activation energies for diffusion of the penetrant were computed from the Arrhenius plots. The activation energy needed for diffusion of penetrant was found to be higher for filled virgin polymers. The transport mechanism was investigated and found that all systems exhibited non-Fickian anomalous behaviour.