Preparation, characterization, and permeation property of a liquid crystal/PDMS membrane material
Preparation, characterization, and permeation property of a liquid crystal/PDMS membrane material
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DOI：
10.1002/app.34450
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发表时间：
2012-01
影响因子：
3
通讯作者：
Huaxin Rao;Zi-yong Zhang
中科院分区：
文献类型：
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作者：
Huaxin Rao;Zi-yong Zhang
通过在聚合物膜中引入有序、流动的液晶基团，以含乙烯基的PDMS、聚甲基氢硅氧烷和胆甾型LC为基体材料，合成了一种新型液晶/聚二甲基硅氧烷（LC/PDMS）膜材料。通过使用 FTIR、差示扫描量热法 (DSC) 和带有热台的偏光显微镜来表征 LC/PDMS 交联膜的化学结构、LC 行为和机械性能。还研究了影响二氧化碳和氮气的渗透性和选择性渗透性的一些因素。这些结果表明，由于在制备过程中将LC基团引入PDMS并发生交联反应，交联膜的成膜性能和渗透性能明显增强。在压差为0.1 MPa、测试温度为40℃时，二氧化碳的渗透系数和二氧化碳与氮气的理想分离因子分别高达4667 Barrer和24.0。此外，掺入含有不饱和键的LC具有进一步改性反应的潜力，例如接枝和交联。 © 2011 Wiley periodicals, Inc. J Appl Polym Sci，2011
By introducing the ordered and flowing liquid crystalline groups into polymeric membranes, a novel liquid crystal/polydimethylsiloxane (LC/PDMS) membrane material is synthesized with PDMS containing vinyl group, polymethylhydrosiloxane and cholesteric LC as matrix materials. The chemical structure, LC behaviors and mechanical performance of the LC/PDMS crosslinked membranes are characterized by using FTIR, differential scanning calorimetry (DSC), and polarized light microscopy with a hot stage. Some factors on permeability and permselectivity for carbon dioxide and nitrogen gas are also examined. These results suggest that the membrane-forming property and permeation properties of the crosslinked membranes are obviously enhanced due to the introduction of the LC groups into PDMS and crosslinking reaction in the preparation process. At pressure difference of 0.1 MPa and testing temperature of 40°C, the permeability coefficient for carbon dioxide and ideal separation factor for carbon dioxide and nitrogen are up to 4667 Barrer and 24.0, respectively. In addition, the incorporation of LC containing unsaturated linkage has the potential for further modification reactions such as grafting and crosslinking. © 2011 Wiley Periodicals, Inc. J Appl Polym Sci, 2011