This paper studies the effect of a chemically modified polyolefin, in this case Polybond, in mica-filled polypropylene composites. Chemically modified polyolefins have been used for years in glass-filled polypropylene for improvements in thermal and mechanical prop erties. This same effect is shown with mica-filled polypropylenes. These improvements are explained by chemical bonding between the carboxylic acids groups of the grafted poly propylene and the mica, and also co-crystallization between the polypropylene chains of the modified polypropylene and the bulk of the polypropylene.
