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vol.8 número3Synthesis of 6α,7β-Di-Hydroxyvouacapan-17β-Oic acid derivatives part III: synthesis, ¹H- and 13C-NMR of amide derivatives¹ índice de autoresíndice de assuntospesquisa de artigos
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Journal of the Brazilian Chemical Society

versão impressa ISSN 0103-5053


ROCHA, Avani Maria C; CARVALHO, Laura Hecker de  e  SOUZA, Antonio Gouveia de. Polystyrene modified by grafting. J. Braz. Chem. Soc. [online]. 1997, vol.8, n.3, pp.197-202. ISSN 0103-5053.

Several grades of modified polystyrene were obtained through the graft polymerization of styrene in the presence of modifiers such as ethylene-vinyl acetate (EVA), low density polyethylene (PE), and polybutadiene (PB). These modifiers were used by themselves and in combination. In all cases, the modifier concentration was kept constant at 8% w/w, and the product properties were determined as a function of composition. The polymerization technique employed was that of mass/suspension. The best results were obtained for the PS/mixed modifiers systems. The results confirm that graft copolymers present better impact properties than those of mechanical blends of similar composition.

Palavras-chave : polystyrene; grafting; polybutadiene; ethylene-vinyl acetate; polyethylene.

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