1,3,5-triisopropylbenzene diffusion in polystyrene solutions
1,3,5-triisopropylbenzene diffusion in polystyrene solutions
复制标题
1,3,5-三异丙基苯在聚苯乙烯溶液中的扩散
DOI：
10.1002/(sici)1099-0488(19960115)34:1
复制
发表时间：
1996
期刊：
影响因子：
--
通讯作者：
I. H. Romdhane
中科院分区：
文献类型：
--
作者：
J. M. Zielinski;H. Sillescu;I. H. Romdhane
Self-diffusion coefficients of 1,3,5-triisopropylbenzene (TIB) in binary solutions with polystyrene and ternary mixtures comprised of TIB, toluene, and polystyrene have been measured by static gradient nuclear magnetic resonance (SG-NMR) techniques. These data, as well as mutual-diffusion coefficient data measured by capillary column inverse gas chromatography (CCIGC), have been analyzed here with the Vrentas-Duda free-volume diffusion model. Although both binary and ternary diffusion coefficient data can be accurately correlated with the model, the results contradict those of an earlier investigation, which suggested that TIB diffuses as a single unit in polystyrene solutions. The new data suggest that either: 1) TIB diffuses by piece-wise displacements in polystyrene solutions, or 2) a diffusive activation energy ceiling value has been reached. The implications of both possibilities are discussed in the context of established free-volume principles. © 1996 John Wiley & Sons, Inc.
