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Indexed by:期刊论文

Date of Publication:2011-08-25

Journal:MATERIALS SCIENCE AND ENGINEERING A-STRUCTURAL MATERIALS PROPERTIES MICROSTRUCTURE AND PROCESSING

Included Journals:SCIE、EI

Volume:528

Issue:22-23

Page Number:6667-6672

ISSN No.:0921-5093

Key Words:ABS resin; Bulk polymerization; Polybutadiene; Rare earth catalyst

Abstract:In situ bulk polymerization process was employed for the synthesis of poly(acrylonitrile-butadiene-styrene) (ABS) resin. Butadiene (Bd) prepolymer solution was obtained through selective polymerization of Bd in styrene (St) catalyzed by Nd(P(507))(3)/Al(i-Bu)(2)H/Et(3)Al(2)Cl(3) catalyst. The catalyst exhibited high activity and selectivity towards the Bd polymerization. The Bd prepolymer yield was higher than 95%. Determined by IR and (1)H NMR spectra, the prepolymer had high cis-1,4 stereoregularity (ca. 96%) and low St content (<3.0%). The resultant polymer solution was directly subjected to free radical copolymerization of acrylonitrile and St to provide ABS. The mechanical properties of the ABS resins were as following: impact strength, 42.2-335.9 J m(-1); tensile strength, 31.9-44.4 MPa; elongation at break, 20.1-47.6%. The impact strength increased with the increase of polybutadiene content. The ABS toughened by prepolymer with broad M(w)/M(n) showed higher impact strength than that having narrow M(w)/M(n) did. Three kinds of initiators, monofunctional BPO, bifunctional DP275B, and trifunctional TETMTPA were examined for the synthesis of ABS. Among them, ABS obtained with DP275B at Bd prepolymer content of 10 wt% displayed the highest impact strength, whose value reached 335.9 J m(-1). (C) 2011 Elsevier B.V. All rights reserved.