乙烯-丙烯共聚物磺酸盐离聚物的研究——Ⅱ.离聚物的合成和表征

STUDY ON IONOMERS OF SULFONATED ETHYLENE-PROPYLENE COPOLYMERS I. THE SYNTHESIS AND CHARACTERIZATION OF IONOMERS

通过氯磺化共聚物的水解合成了乙烯-丙烯共聚物磺酸钠离聚物,对离聚物的结晶度和其中硫、氯、钠元素的含量进行了表征.当离子含量达到5—7 mol％时,离聚物的LAXD曲线出现离子峰;DSC指出T_g急剧升高,而低于此离子浓度的离聚物均不出现这些现象.反映出此离子浓度下的离聚物,离子基因可能聚集形成离子簇结构.

A series ionomers of sulfonated ethylene-propylene copolymers containing -SO3Na group from 0 to 12. 0 mol% have been prepared by hydrolysis of chlorosulfonated copolymers. Three methods were used for analysis of sulfur and chlorine contents in ionomers. Decrease in crystallinity for ionomers with increase in -SO3Na group concentration was showed by DSC and WAXD curves. The ionic peak in the LAXD curves and the marked increase of T, with ion concentration were observed only for ionomers sulfonated above 5-7 mol%. These facts were considered to be evidences for the existence of ionic clusters in samples sulfonated above the critical concentration.