ABS modified with hydrogenated polystyrene‐grafted‐natural rubber. Issue 1 (3rd November 2012)

• Record Type: Journal Article
• Authors: Pisuttisap, Anawat; Hinchiranan, Napida; Rempel, Garry L.; Prasassarakich, Pattarapan
• Is Part Of: Journal of applied polymer science. Volume 129:Issue 1(2013:Jul. 05)
• Page Start: 94
• Page End: 104
• Publication Date: 2012-11-03
• Subjects: Polymers -- Periodicals; Polymerization -- Periodicals; 668.9
• DOI: 10.1002/app.38691
• Languages: English
• ISSNs: 0021-8995

Abstract

<abstract abstract-type="main" xml:lang="en"> <title>Abstract</title> <p>Natural rubber (NR) latex was grafted by emulsion polymerization with styrene monomer, using cumene hydroperoxide/tetraethylene pentamene as redox initiator system. The polystyrene‐grafted NR (PS‐<italic>g</italic>‐NR) was hydrogenated by diimide reduction in the latex form using hydrazine and hydrogen peroxide with boric acid as a promoter. At the optimum condition for graft copolymerization, a grafting efficiency of 81.5% was obtained. In addition, the highest hydrogenation level of 47.2% was achieved using a hydrazine:hydrogen peroxide molar ratio of 1:1.1. Hydrogenation of the PS‐<italic>g</italic>‐NR (H(PS‐<italic>g</italic>‐NR)) increased the thermal stability. Transmission electron microscopy analysis of the H(PS‐<italic>g</italic>‐NR) particles revealed a nonhydrogenated rubber core and hydrogenated outer rubber layer, in accordance with the layer model. The addition of H(PS‐<italic>g</italic>‐NR) at 10 wt % as modifier in an acrylonitrile–butadiene–styrene (ABS) copolymer increased the tensile and impact strengths and the thermal resistance of the ABS blends, and to a greater extent than that provided by blending with NR or PS‐<italic>g</italic>‐NR. © 2012 Wiley Periodicals, Inc. J. Appl. Polym. Sci., 2013</p> </abstract>