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Morphology and Thermal Behaviour of SAN/EPDM Blends

Blends of styrene-acrylonitrile (SAN) with ethylene-propylene-diene (EPDM) with and without high impact polystyrene (HIPS) as a compatibilizer were studied. One series of blends were prepared in composition 95/5, 90/10, 85/15, 80/20 and 60/40 ; and the second seria of blends were prepared with addition of 5 wt % of HIPS. Their morphology and thermal behaviour were inspected by scanning electronic microscopy, SEM and dynamic mechanic analysis DMA, respectively. Further on, blends were separated on its components by Soxlet extraction in selective solvent and characterized by Fourier Transform Infrared Spectroscopy, FTIR and gel permeation chromatography, GPC, respectively. The results of morphological observations reveal that the addition of a small percentage of compatibilizer decreases the domain size of the dispersed phase and the compatibility of the blends was enhanced. The shifts of Tg values in the examined blends also indicate that with addition of compatibilizer HIPS miscibility between SAN and EPDM is improved.

polymer blends; thermal properties; morphology

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