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6677697 
Journal Article 
INITIATED STYRENE CO-POLYMERIZATION WITH RUBBER .1. STUDYING POLYSTYRENE GRAFTING TO RUBBER AND MOLECULAR-WEIGHT CHARACTERISTICS OF HOMOPOLYSTY RENE MATRIX 
Yenalyev, VD; Melnichenko, VI; Noskova, NA; Bokunenko, OP; Yegorova, YI; Podosenova, NG; Budtov, VP; , 
1979 
AMER CHEMICAL SOC 
WASHINGTON 
Am Chem Soc Div Org Coat Plast Chem Prepr 
40 
184-184 
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WOS:A1979GN80600792 
Styrene copolymerization with rubber initiated by the mixture of peroxides with different thermal stability is widely used for receiving HIPS (high impact polystyrene) in industry. Such initiation allows regulation of the process rate at all stages and variation of physical and chemical properties of the achieved material in wide terms. Deep knowledge of qualitative regularities of molecular weight as well as structural parameter formation of polymer compositions give rounds for theoretic consideration of the problem of optimal steering reactions of polymer synthesis. In the reported experiments, effect of process variables on the course at PS grafting onto polybutadiene was examined. The degree of grafting polystyrene onto polybutadiene was determined by the method of selective dissolving the molecular weight (MW) and molecular weight distribution (MWD) of homo polystyrene was measured viscosymetrically by the method of GPC. Due to the experimental data the regression equations were obtained connecting the molecular weight characteristics of polystyrene matrix, the degree of grafting of polystyrene onto rubber and the equilibrium degree of gel swelling, which define the physical and mechanical properties of HIPS to a greater extent, with parameters conditioning the process of initiated polymerization. Experimental data are plotted, analyzed and discussed in terms of recommendations for practice. 
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