文献类型：期刊文献

英文题名：MOLECULAR-WEIGHT DEPENDENCE OF MOBILITY IN POLYMER BLENDS

作者：FENG, Y; HAN, CC; TAKENAKA, M; HASHIMOTO, T

机构：[1]NATL INST STAND & TECHNOL,DIV POLYMERS,GAITHERSBURG,MD 20899;[2]E CHINA UNIV CHEM TECHNOL,DEPT POLYMER SCI & ENGN,SHANGHAI 200237,PEOPLES R CHINA;[3]KYOTO UNIV,DEPT POLYMER CHEM,KYOTO 606,JAPAN

年份：1992

卷号：33

期号：13

起止页码：2729

外文期刊名：POLYMER

收录：;WOS:【SCI-EXPANDED(收录号:WOS:A1992JC85300013)】；

语种：英文

外文关键词：MOLECULAR WEIGHT DEPENDENCE; MOBILITY; POLYMER BLENDS

摘要：The molecular weight dependence of mobility in polystyrene/poly(vinyl methyl ether) blends (PS/PVME), in polybutadiene/styrene-butadiene random copolymer (PB/SBR) blends and in polyisoprene/styrene-butadiene random copolymer (PI/SBR) blends has been studied by time resolved light scattering. In the case of PS/PVME, blend samples were quenched from an initial equilibrium temperature, close to the critical temperature, to a final temperature which is deeper in the miscible region. The decay of concentration fluctuations was measured, and the interdiffusion coefficient was deduced, then mobilities were calculated. In the PB/SBR and PI/SBR blends, samples were homogenized by uniaxial compression and interdiffusion coefficients were obtained through time resolved light scattering measurement in the early stage of spinodal decomposition. Mobility was related to the ratio of the interdiffusion coefficient and q(m)2 (0), with q(m)(0) as the peak position which corresponds to the dominant mode of concentration fluctuations in the early stage of spinodal decomposition. It is clear from our results that mobility can be represented by the vacancy model at lower molecular weights but shows deviation towards the incompressible model at higher molecular weights. The converse can also be said. The overall molecular weight dependence of the mobility can be well represented by the Akcasu-Naegele-Klein equation.