STYRENE-CO-ACRYLONITRILE RESIN MODIFICATIONS OF PVC CPE BLENDS/

The effects of styrene-co-acrylonitrile resin (AS) on the mechanical p roperties, morphology, and plasticizing and theological behaviors of p oly(vinyl chloride)/chlorinated polyethylene (PVC/CPE) blends are stud ied. The results show that the impact strength and the tensile strengt h are all increased and the plasticizing and theological behaviors are also improved when a certain amount of AS is added into PVC/CPE blend s, which are different in characteristics and regularity from plastics toughened with elastomers. It is blends of brittle-ductile transition regions (i.e., PVC/CPE = 100/10, 100/15) that can obviously be toughe ned by AS. The analysis of the morphological structure shows that AS p romotes the formation of a CPE network that embeds the primary particl es of PVC. (C) 1997 John Wiley & Sons, Inc.