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.
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].
出处
《东华大学学报（自然科学版）》
CAS
CSCD
北大核心
2012年第3期241-245,共5页
Journal of Donghua University(Natural Science)
基金
国家自然科学基金资助项目(50873025)
上海市教育科研创新资助项目(10ZZ44)
上海市教委"曙光跟踪计划"资助项目(08GG11)
关键词
光散射
聚丙烯腈
离子液体
单分子链
无规线团构象
light scattering
polyacrylonitrile
ionic liquid
single chain
random coil conformation
