含氟离聚体的多相结构及大分子链运动的NMR研究

CARBON-13 NMR STUDIES ON MULTIPHASE STRUCTURES AND CHAIN DYNAMICS OF FLUORINE-CONTAINING IONOMERS

本文用^(13)C自旋-自旋弛豫时间T_2表征了以丙烯酸-1,1,5-三氢全氟戊酯-丙烯酸共聚物为基础的离聚体体系的多相结构和大分子链段运动特性,结果表明:离子微区和聚合物基体之间存在界面层,聚合物主链的运动活性与离聚体的共聚物组成、金属离子特性、离子化程度、离子微区的稳定性和离子微区内的精细结构均有密切关系.

The multiphase structures and chain dynammics of fluorine-containing ionomers were investigated by means of C-13 spin-spin relaxation time (T2) and spin-lattice relaxation time (T1). The biexponential spin-spin relaxation of main chain carbon atoms of ionomers was observed. The fast relaxation component described the interface between ionic micro-domains and polymer matrix, ahd the slow relaxation component related to the polymer maltrix. The polymer chains in the interface arranged more regularly than that in continuous phase. The dynamic activities of polymer chain of ionomers formed by different metal ions had something to do with the characterization of metal ions and the fine structures of ionic microdomains, and it decreased with the increasing of the content of carboxylic groups and ionization degree.