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Polímeros

versão impressa ISSN 0104-1428versão On-line ISSN 1678-5169

Resumo

CESAR-OLIVEIRA, Maria A. F. et al. Synthesis of methacrylic copolymers by chemical modification of poly(methyl methacrylate) with controlled molecular weight. Polímeros [online]. 1999, vol.9, n.4, pp.156-162. ISSN 1678-5169.  https://doi.org/10.1590/S0104-14281999000400026.

Controlled molecular weight poly(methyl methacrylate) (PMMA) was synthesized in toluene solution using benzoyl peroxide/dodecanethiol as initiator/chain transfer agent system. The effect of the thiol concentration on the molecular weight of PMMA was investigated. Methyl methacrylate and methacrylic acid copolymers, P(MMA-MAA), were prepared by partial hydrolysis of the PMMA homopolymers of different molecular weights. By reacting the acid residues of the copolymers with long chain alcohols, in the presence of 1,3-dicyclohexylcarbodiimide and 4-dimethylaminopyridine, copolymeric esters of PMMA with long chain substituents, such as hexadecyl, were obtained. This technique has not been reported in the literature for the synthesis of PMMA esters.

Palavras-chave : Poly(methyl methacrylate); 1-dodecanethiol; poly(methyl methacrylate-co-methacrylic acid); hydrolysis; metacrylic copolymers; chemical modification.

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