AGGREGATION BEHAVIOR OF OMEGA-METAL AND ALPHA,OMEGA-METAL SULFONATO POLYSTYRENE IN TOLUENE

被引:19
作者
VANHOORNE, P [1 ]
JEROME, R [1 ]
机构
[1] UNIV LIEGE,CTR EDUC & RES MACROMOLECULES,B-4000 LIEGE,BELGIUM
关键词
D O I
10.1021/ma00120a036
中图分类号
O63 [高分子化学(高聚物)];
学科分类号
070305 ; 080501 ; 081704 ;
摘要
The aggregation behavior of omega- and alpha,omega-metal sulfonato polystyrene in toluene has been investigated by static and dynamic light scattering. Monofunctional chains reversibly associate into small reverse micelles. Lithium-based ionic aggregates contain an average of 12 ion pairs, which corresponds to a preferential structure for the ionic cores. When the molecular weight of the chains is increased, polymer-solvent interactions progressively distort the ionic aggregates, and above a critical molecular weight, estimated to be 50000 in toluene, the multiplets collapse into smaller aggregates of an average of 3 ion pairs. Traces of polar solvents do not strongly affect the aggregation number, but do weaken the dipole-dipole interactions. Structure of the ionic cores strongly depends on the nature of the ion pairs, which suggests that this structural feature is a key parameter in the control of the structure-property relationships in ionomers. The aggregation behavior of the difunctional chains is complex, due to the occurrence of a closed association mechanism for the individual multiplets and an open association of reverse micelles into larger aggregates.
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页码:5664 / 5670
页数:7
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