文献类型：期刊文献

英文题名：Relationship between carbon dioxide transport, free volume and morphology of polyolefin-based polyurethanes

作者：Yang, Yu-Run[1]; Wang, Zhi-Fen[2]; Wang, De-Ning[1]; Wang, Bo[1]; Hu, Chun-Pu[1]

机构：[1]E China Univ Sci & Technol, Sch Mat Sci & Engn, Shanghai 200237, Peoples R China;[2]Wuhan Univ, Dept Phys, Wuhan 430072, Peoples R China

年份：2004

卷号：53

期号：7

起止页码：931

外文期刊名：POLYMER INTERNATIONAL

收录：;EI(收录号：2004308277642);WOS:【SCI-EXPANDED(收录号:WOS:000222283900019)】；

语种：英文

外文关键词：positron annihilation lifetime spectroscopy; polyolefin-based polyurethane; carbon dioxide; transport; morphology

摘要：A series of polyurethane (PU) films, produced from toluene diisocyanate, 1,4-butane diol and either hydroxyl-terminated polybutadiene (HTPB), hydroxyl-terminated polybutadiene/acrylonitrile (HTBN) or hydroxyl-terminated polybutadiene/styrene (HTBS), was synthesized by solution polymerization. Differential scanning calorimetry (DSC), Fourier-transform infrared (FT-IR) spectroscopy, and positron annihilation lifetime (PAL) spectroscopy were used to investigate the morphologies and free volumes of these polyolefin-based polyurethanes. The free volumes were closely related to the morphologies of such PUs. HTBN-based PUs showed the lowest degree of phase separation, the smallest fraction of free volume and smallest hole radius among the three types of polyolefin-based PUs, while the HTPB-based PUs displaying the largest values. The diffusion and permeation coefficients decreased with decreasing degree of phase separation and increasing content of hard segments. The transport data were in relation to the free volume and fitted the Fujita free-volume model. (C) 2004 Society of Chemical Industry.