CORRELATION BETWEEN MORPHOLOGY WITH DYNAMIC MECHANICAL, THERMAL, PHYSICOMECHANICAL PROPERTIES AND ELECTRICAL-CONDUCTIVITY FOR EVA-LDPE BLENDS

Morphology, dynamic mechanical analysis, differential scanning calorim etry (d.s.c.), physicomechanical properties and electrical resistivity were studied on different blends of ethylene vinyl acetate (EVA) (28% VA content) and low density polyethylene (LDPE). An interpenetrating polymer network (IPN) is formed with a minimum of 50wt% EVA in the ble nd. The glass transition temperatures change with blend compositions a ccording to the Fox equation or the Gordon-Taylor relation. This indic ates intermiscibility (compatibility). On curing, tensile strength goe s up dramatically, and a maximum tensile value is obtained for 50:50 b lend composition. The electrical resistivity of the blends is explaine d by a simple model, and can be correlated to morphology.