质子交换膜（PEM）是燃料电池的核心组件之一，其质子导电能力与材料纳米尺度的微结构密切相关。含离子基团的嵌段共聚高分子由于能够自组装成可调控的长程有序的质子（或水分子）传导网络，从而呈显出增强的质子导电能力。本项目拟以两类典型的磺化嵌段共聚物为研究对象，着重研究晶体和非晶两类不同疏水基体对水通道结构和水运动性的影响，了解基底性质或结构与水通道结构之间的相互关系。利用多种固体NMR技术（NMR谱和弛豫参数测量）并结合TEM、x-ray、DSC等方法研究材料的微结构和链段动力学、水分子扩散运动的性质以及水分子与高分子之间的相互作用；研究微结构与质子导电之间的关系，探索相形成规律和相分离的机理，为材料改性和设计高导电性能的高分子质子交换膜提供依据。本课题属于凝聚态物理、高分子科学和NMR的交叉学科。

Proton exchange membrane (PEM) is one of the core components of the polymer electrolyte membrane fuel cells (PEMFCs), and its proton conductivity is closely related to the nano-scale microphase separation of the membrane. Block copolymer containing ionic groups showed enhanced proton conductivity compared to random copolymers due to the self-assembled formation of controlled long-range ordered network for proton (or water) transport. In this proposal, two types of sulfonated block copolymers with different hydrophobic blocks, crystalline and noncrystalline, are chosen for studying the effects of crystalline and noncrystalline matrix on water channel and for understanding the relationship between matrix and channel structures.To explore the microstructure-conductivity relationship, this project will investigate the microstructure, the dynamics of chain segments, and the diffusion of H2O as well as the interaction between H2O and membrane, using a variety of solid-state NMR techniques (NMR spectra and relaxation parameter measurements) combined with TEM and x-ray, DSC and other methods. This subject belongs to the interdiscipline of condensed matter physics, polymer science and NMR.