engleski

Effect of Compatibilizer EPDM-g-PS Graft Copolymers on Properties of SAN/EPDM Polymer Blends

Abstract: Polymer blends offer mechanical and thermodynamic properties which are both unique and attractive for many industrial applications. There is a general agreement that the properties of polymer blends are usually controlled by the properties of the components, morphology of the blends and interaction between components in blends. Immiscibility of the most polymers today requests compatibilization with graft or block copolymers. Graft copolymers can be prepared by graft polymerization in solution or by reactive extrusion in bulk. In this work diversity in structure (various graft density and graft length) of EPDM-g-PS graft copolymers were accomplished by addition of coagent triallylcyanurate, TAC. Extracted graft copolymers were further used as compatibilizer in SAN/EPDM polymer blends which were prepared as thin films in ratio of 95/5/5 and 90/10/5. The effect of dissimilar structure of graft copolymers on miscibility in blends was followed by determination of mechanical properties, by examining morphology by scanning electronic microscopy (SEM) and by determination of surface free energy parameters. From the results it can be seen that various structure of graft copolymers has significantly effect on the miscibility of blends.

compatibilizer; graft copolymer; in situ polymerization; miscibility; polymer blend

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