Influence of styrene-acrylonitrile oligomers on the properties of ABS graft copolymers

✍ Scribed by Juergen Schellenberg; Bernd Hamann

• Publisher: Elsevier Science
• Year: 1993
• Tongue: English
• Weight: 282 KB
• Volume: 29
• Category: Article
• ISSN: 0014-3057
• DOI: 10.1016/0014-3057(93)90135-3

✦ Synopsis

Abstract~Oligomers of styrene and acrylonitrile were isolated from solven~monomer mixtures of a bulk/solution polymerization; they were characterized. There was a study of the influence of these oligomers on thermal, mechanical and processing properties of acrylonitrile-butadiene~styrene (ABS) graft copolymers. The relation between Tg and the oligomer concentration was examined both for the poly(styrene-co-acrylonitrile) phase of the ABS graft copolymer and the rubber-free polymer. Tests on the equations of Fox, Pochan, Gordon Taylor and Couchman showed that the last gave the best agreement with experimental results. A maximum of the notched impact resistance and a relatively constant flexural strength of the ABS graft copolymers were found for oligomer concentrations up to 2.5 wt%. The tensile strength decreases and the melt flow index of the graft copolymers increases particularly at concentrations above 1.5 wt% of oligomers.