NMR Studies of Micro-Structured and Nano-Structured Polymeric Membrane Systems

摘要

This report describes our achievement in the investigation of the influence of structure on diffusion in styrene-ethylene/ butylene-styrene triblock copolymers (SEBS) during the period of June 1, 2006 to November 30, 2006. This type of triblock copolymers has the potential for chemical protection and fuel cell application. Our progress is made in the following fields: (I) Pulse-field- gradient (PFG) Nuclear Magnetic Resonance (NMR) study of the translational diffusion; (II) lattice model simulation of diffusion. From the study, it shows that the copolymer structure and the extent of sulfonation of SEBS have significant influence on penetrant diffusion and sulfonated SEBS (sSEBS) may have a good selectivity for water over DMMP depending on the SEBS structure.