中文摘要：

采用激光光散射法研究了聚丙烯腈（PAN）在1-乙基-3-甲基咪唑甲基磷酸酯盐[EMIM][（CH3O）HPO2]中的稀溶液性质.研究结果表明,[EMIM][（CH3O）HPO2]是PAN的良溶剂,PAN在[EMIM][（CH3O）HPO2]中是以单分子链形式存在的,呈无规线团构象;同时PAN分子链在[EMIM][（CH3O）HPO2]中的柔顺性比在常规溶剂如二甲基亚砜（DMSO）中要小很多.推测阴离子与PAN有很强的相互作用以及阳离子的空间位阻效应都能有效破坏PAN分子链间的偶极结构,这是导致PAN以单分子链形式溶解在[EMIM][（CH3O）HPO2]中的主要原因.

英文摘要：

The dilute solution properties of polyacrylonitrile （PAN） in 1-ethyl-3-methylimidazolium methylphosphonate [（CH3O）HPO2] are investigated by laser light scattering. The research results indicate that [（CH3O）HPO2] is a good solvent for PAN, and a single chain conformation is observed for PAN in [（CH3O）HPO2]. It is a random coil conformation for PAN chain in [（CH3O）HPO2]. The research results also show that the flexibility of PAN decreases in [（CH3O）HPO2] comparing with in dimethyl sulfoxide （DMSO）. It is supposed that the strong interaction between anion of ionic liquid and cyan group of PAN, together with the steric hindrance effect of cation, could damage the dipole structures of PAN molecules, which is the main result for PAN existing as single chains while dissolving in [（CH3O）HPO2].