engleski

Effect of SAN/EPDM Blends Composition on Morphology and Mechanical Properties

The modification of a polymeric material by adding one or more other polymers is highly economical to achieve superior performance instead of synthesizing new materials. Polymer blends are usually thermodynamically immiscible and, when blended, usually display poor properties, owing to their unstable morphology and poor adhesion between the phases. Compatibilizer in polymer blends reduces the interfacial tension of two immiscible polymers and increases the adhesion between their phases. Blending of styrene-acrylonitrile copolymer (SAN) and ethylene-propylene-diene terpolymer (EPDM) can combine their good properties including weatherability and good mechanical strength. Polymer blends were prepared by extrusion of the SAN and EPDM polymers, at ratio 95/5, 90/10, 85/15, 80/20 and 60/40. Polymer blends 90/10 were further studied by adding compatibilizer high impact polystyrene (HIPS) in different amount as follow: 90/10/5, 90/10/7.5, 90/10/10 and 90/10/15 respectively. Mechanical properties (tensile strength, elongation at break and impact strength) were carried out on the injection molded blends. Morphology of prepared blend was followed by scanning electron microscopy (SEM). From the results it is obvious that enhance of compatibility of polymer blends has significantly influence on mechanical and physical properties.

SAN; EPDM; polymer blends; compatibility

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