Effect of substituted groups on characterization and water vapor sorption property of polyhedral oligomeric silsesquioxane (POSS)-containing methacryl polymer membranes
Effect of substituted groups on characterization and water vapor sorption property of polyhedral oligomeric silsesquioxane (POSS)-containing methacryl polymer membranes
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DOI：
10.1016/j.polymer.2013.03.002
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发表时间：
2013-04-19
期刊：
影响因子：
4.6
通讯作者：
Nagai, Kazukiyo
中科院分区：
文献类型：
--
作者：
Kanehashi, Shinji;Tomita, Yuko;Nagai, Kazukiyo
研究了取代基对含多面体低聚倍半硅氧烷（POSS）的甲基丙烯酸聚合物的特性和水蒸气吸附性能的影响。在 X 射线衍射图中观察到宽晕，这表明所有膜都是无定形结构。有趣的是，较小体积的取代基往往会因聚合物链段的堆积而引起 POSS 结构的较大变形。环取代POSS单元的引入由于刚性的增加而提高了它们的热稳定性。所有含 POSS 的聚合物膜的吸附行为在较低相对压力下遵循双模式模型，然后在较高压力下上升。由于大量过剩的自由体积和堆积效应覆盖的疏水性 POSS 单元的抑制，苯基-POSS 显示出高溶解度。基于这些结果，POSS单元的引入增强了疏水性，而取代基团的极性强烈影响水蒸气聚集。 (C) 2013 Elsevier Ltd. 保留所有权利。
The effects of substituted groups on the characteristics and water vapor sorption property of polyhedral oligomeric silsesquioxane (POSS)-containing methacryl polymers were investigated. A broad halo was observed in the X-ray diffraction profile, which suggests that all membranes were amorphous structure. Interestingly, the smaller volume of substituted groups tended to induce the larger deformation of POSS structure resulting from the packing of polymer segments. The introduction of ring-substituted POSS unit improved their thermal stability due to the increase in the rigidity. The sorption behavior for all POSS-containing polymer membranes obeyed the dual-mode model at lower relative pressure and then upturns at higher pressure. The phenyl-POSS shows the high solubility due to the large excess free volume and suppression of hydrophobic POSS unit covered by the stacking effect. Based on these results, the introduction of POSS unit enhances the hydrophobic property, while the polarity of substituted groups strongly affects the water vapor clustering. (C) 2013 Elsevier Ltd. All rights reserved.