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Bulk and emulsion copolymerizations of n-butyl acrylate and poly(methyl methacrylate) macromonomer

✍ Scribed by P. Rajatapiti; V. L. Dimonie; M. S. El-Aasser

Publisher
John Wiley and Sons
Year
1996
Tongue
English
Weight
865 KB
Volume
61
Category
Article
ISSN
0021-8995

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✦ Synopsis

Bulk and emulsion copolymerizations of an w-unsaturated poly(methy1 methacrylate) (PMMA) macromonomer with n-butyl acrylate (n-BA) were investigated. The reactivity of PMMA macromonomer in bulk copolymerization with n-BA was found to be lower than that of methyl methacrylate monomer with n-BA. The incorporation of PMMA macromonomer into poly(buty1 acrylate) (PBA) latex particles by miniemulsion copolymerization was proved by high performance liquid chromatography-silica adsorption spectroscopy. Dynamic mechanical studies showed that PMMA macromonomer was grafted to the PBA backbone, and the degree of grafting increased as the ratio of PMMA macromonomer to n-BA increased. Microphase separation of the PMMA macromonomer grafts was observed at higher ratio of macromonomer (higher or equal to 10% weight of macromonomer based on total polymer phase). The n-BAIPMMA macromonomer copolymer behaved completely differently from the physical blend of PBA and PMMA macromonomer particles of the same composition.

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