Gas Permeability and Free Volume Hole Properties of Interpenetrating Polymer Network Studied by Positrons

查看全文 作　　者：QI [1]Ning;GONG [1]Wei;WANG [1]Zhifen;WANG [1]Bo;YANG [2]Yurun;HU [2]Chunpu 机构地区：[1]School of Physics and Technology, Wuhan University, Wuhan 430072, Hubei, China;[2]Institute of Material Science and Engineering, East China University of Science and Technology, Shanghai 200237, China 出　　处：《Wuhan University Journal of Natural Sciences》索引2007年第12卷第2期,共4页 基　　金：Supported by the National Natural Science Foundation of China (20374038) 摘　　要：A series of polyurethane/epoxy resin interpenetrating polymer networks (PU/ER IPN) were studied by positron annihilation lifetime spectroscopy (PALS). The effects of epoxy resin type and content on the free volume properties in IPN were investigated. We found that in PU/ER IPN, the free volume hole size and fractional free volume showed a negative deviation due to closer segmental chain packing through some chemical bonding between PU and epoxy resin. Direct relationship between the gas permeability and the free volume has been established based on the free volume theory. Experimental results revealed that the free volume plays an important role in determining the gas diffusion and permeability. 关 键 词：互穿聚合物网络 气体渗透性 自由体积理论 空穴性质 正电子湮没