2H NMR研究嵌段共聚物溶致液晶相的结构演化与水分子动力学行为

采用2H NMR实验结合谱图线型的理论模拟方法研究了两亲性嵌段共聚物聚氧乙烯一聚氧丙烯一聚氧乙烯／氘代水／对二甲苯三元体系形成的不同液晶相的结构演化和水分子动力学行为．结果表明，对不同组分浓度的样品，2H谱线型发生明显的变化，对应体系从各向同性相、六角相和层状相间的系列结构转变．通过NMR弛豫模型获得了液晶相结构演化中序参数和分子运动相关时间的变化规律，理论模拟获得的自旋．晶格弛豫时间T1、自旋-自旋弛豫时乃等水分子动力学参数与实验测量结果吻合．结果表明：层状相四极劈裂及序参数随嵌段共聚物或二甲苯含量的增加呈现一个极大值，水分子的兀随着嵌段共聚物浓度增加而明显减小，而疋在六角相到层状相的转变中发生了明显的变化．研究表明，通过理论模拟2HNMR实验获得的谱图线型是研究液晶相结构演化和动力学的有力工具．

~2H NMR studies of the structural evolution and water dynamics in lyotropic liquid crystals containing block copolymers

2H NMR experiments in combination with theoretical analysis of the line shape were employed to investigate the dynamics behavior of water and structural evolution in a ternary isothermal system consisting of poly(ethylene oxide-b-propylene oxide-b-ethylene oxide) amphiphilic tri-block copolymer,deuterated water(D2O) and p-xylene,where D2O and p-xylene are selective solvents for the different blocks of the copolymer.This system can self-assemble to form thermodynamically stable lyotropic liquid crystals with...