Temperature dependence of methanol and ethanol vapor sorption in polyhedral oligomeric silsesquioxane (POSS) containing methacrylate membranes,Journal of Polymer Science

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Temperature dependence of methanol and ethanol vapor sorption in polyhedral oligomeric silsesquioxane (POSS) containing methacrylate membranes
Journal of Polymer Science ( IF 3.9 ) Pub Date : 2020-04-17 , DOI: 10.1002/pol.20200048
Yukiko Moriizumi ₁ , Hajime Fukuda ₁ , Seiya Tanaka ₁ , Daisuke Tanaka ₁ , Kazukiyo Nagai ₁

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This study aimed to determine the solubility and temperature dependence of methanol and ethanol vapor caused by the difference in the substituents of polyhedral oligomeric silsesquioxane (POSS)‐containing polymethacrylate membranes and the spacer length between the backbone and POSS backbone. Vapor sorption of methanol and ethanol was measured at 25°C, 35°C, and 45°C for three kinds of POSS‐containing polymer membranes, namely, poly(methacryl isobutyl POSS), poly(methacrylate isobutyl POSS), and poly(methacryl phenyl POSS). The primary structures of the three POSS‐containing polymer chains were columnar. The solubility of alcohol vapor on the POSS‐containing polymer membranes followed the mechanism of solid adsorption and not the general dissolution diffusion. The sorption amount at all three temperatures was related to the surface area of the cylindrical primary structure and the solid adsorption property of the alcohol molecule of the POSS substituent. The sorption amount increased because of the large surface area and adsorption property of alcohol molecules. Although a typical glassy polymer shows exothermic mixing and a rubbery polymer displays endothermic mixing, the sample with the POSS substituent of isobutyl group exhibited an unusual behavior of endothermic mixing despite being a glassy polymer.

中文翻译：

含甲基丙烯酸酯膜的多面体低聚倍半硅氧烷（POSS）中甲醇和乙醇蒸气吸附的温度依赖性

这项研究旨在确定由多面体低聚倍半硅氧烷（POSS）的聚甲基丙烯酸酯膜的取代基的差异以及主链与POSS主链之间的间隔长度引起的甲醇和乙醇蒸气的溶解度和温度依赖性。在25°C，35°C和45°C下测量了三种含POSS的聚合物膜的甲醇和乙醇的蒸气吸附，即聚（甲基丙烯酸异丁酯POSS），聚（甲基丙烯酸异丁酯POSS）和聚（甲基丙烯酸苯基POSS）。包含三个POSS的聚合物链的主要结构为圆柱状。醇蒸气在含POSS的聚合物膜上的溶解度遵循固体吸附机制，而不是一般的溶解扩散机制。在所有三个温度下的吸附量都与圆柱形一级结构的表面积和POSS取代基的醇分子的固体吸附性能有关。由于醇分子的大表面积和吸附性能，吸附量增加。尽管典型的玻璃状聚合物显示出放热混合，而橡胶状聚合物显示出吸热混合，但是具有异丁基的POSS取代基的样品尽管是玻璃状聚合物，但仍表现出异常的吸热混合行为。

更新日期：2020-04-17

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