Sintese, estrutura-morfologia e relação com propriedades macroscopicas do modificador de impacto poli (metacrilato de metila-co-butadieno-co estireno), MB&

AUTOR(ES)
DATA DE PUBLICAÇÃO

1993

RESUMO

Poly(vinyl Chloride), PVC, is an of thermoplastics more useful because exhibits many excellent properties, but impact resistence is not one of them. This properties can be improved with the mixture of impact modifiers in the PVC. In this work was studied the synthesis of poly(methyl methacrylate-co-butadiene-co-styrene), MBS, and the effect of his structure and morphogy on the appearing of fish eyes in products obtained with PVC compounds. The grafting of methyl methacrylate (MMA) and Styrene (St) monomers in poly(butadiene-co-styrene), SBR, seeds is in the double bonds and methine protons, the polymerizations of those monomers produces homopolymers. The MBS particles have an core-shell morphology, core of butadiene and shell of MMA and St, this morphology is products of the interfacial polymerization of monomers in the seeds. The grafting of MMA and St reduce the thermical stability of SBR. MBS with irregular particles, bimodal size (two families) and random morphology products fish eyes. Parameters as well as the effect of temperature on the structure and distributions of vitreous groups, size and format of particle for not produces fish eyes.

ASSUNTO(S)

monomeros polimeros termoplasticos

ACESSO AO ARTIGO

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