Different polymers containing sulfonic groups attached to the phenyl rings were prepared by sulfonation of polystyrene (PS) and styrene-block- (ethylene-co-1-butene)-block-styrene (SEBS). The sulfonation degree (SD) was varied between 1 and 20mol% of the styrene units. Polyphase materials containing sulfonated units were prepared by blending styrene-block-butadiene-block-styrene (SBS), with both sulfonated PS and sulfonated SEES in a Brabender mixer. Such a procedure was performed as an alternative route to direct sulfonation of SBS which is actually not selective towards benzene rings because of the great reactivity of the double bonds in polybutadiene (PE) blocks to sulfonation agents. Thermal and dynamic-mechanic analysis, together with morphology characterization of the blends, is consistent with obtaining partially compatible blends characterized by higher T, of the polystyrene domains and improved thermal stability.
Blending of styrene-block-butadiene-block-styrene copolymer with sulfonated vinyl aromatic polymers
RUGGERI, GIACOMO;
2001-01-01
Abstract
Different polymers containing sulfonic groups attached to the phenyl rings were prepared by sulfonation of polystyrene (PS) and styrene-block- (ethylene-co-1-butene)-block-styrene (SEBS). The sulfonation degree (SD) was varied between 1 and 20mol% of the styrene units. Polyphase materials containing sulfonated units were prepared by blending styrene-block-butadiene-block-styrene (SBS), with both sulfonated PS and sulfonated SEES in a Brabender mixer. Such a procedure was performed as an alternative route to direct sulfonation of SBS which is actually not selective towards benzene rings because of the great reactivity of the double bonds in polybutadiene (PE) blocks to sulfonation agents. Thermal and dynamic-mechanic analysis, together with morphology characterization of the blends, is consistent with obtaining partially compatible blends characterized by higher T, of the polystyrene domains and improved thermal stability.I documenti in IRIS sono protetti da copyright e tutti i diritti sono riservati, salvo diversa indicazione.
