Investigation of Enhanced Free Volume in Nanosilica-Filled Poly(1-trimethylsilyl-1-propyne) by 129Xe NMR Spectroscopy
Investigation of Enhanced Free Volume in Nanosilica-Filled Poly(1-trimethylsilyl-1-propyne) by 129Xe NMR Spectroscopy
复制标题
通过 129Xe NMR 光谱研究纳米二氧化硅填充的聚（1-三甲基甲硅烷基-1-丙炔）中增强的自由体积
DOI：
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发表时间：
2003
期刊：
影响因子：
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通讯作者：
E. Stejskal
中科院分区：
文献类型：
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作者：
T. Merkel;L. Toy;A. Andrady;H. Gracz;E. Stejskal
含纳米颗粒气相二氧化硅的聚[1-（三甲基硅基）-1-丙炔]（PTMSP）的透气性随着填料含量的增加而增加。利用129Xe核磁共振光谱分析了填料对PTMSP基质自由体积的影响，探讨了这种不寻常的现象。129Xe核磁共振化学位移随气相二氧化硅浓度的增加而有规律地减小，这与可以发生分子运输的自由体积元素或空腔的平均尺寸的增加相一致。报道了化学位移与填充聚合物气体渗透性之间的关系。
The gas permeability of poly[1-(trimethylsilyl)-1-propyne] (PTMSP) containing nanoparticulate fumed silica increases with increasing filler content. This unusual phenomenon is explored using 129Xe NMR spectroscopy to examine the effect of filler on the free volume of the PTMSP host matrix. The 129Xe NMR chemical shift decreases regularly with increasing fumed silica concentration, consistent with an increase in the average size of free volume elements or cavities through which molecular transport can occur. A relationship between the chemical shift and gas permeability in the filled polymer is reported.