The characterization of in-situ graft copolymer formed in polystyrene/poly(methyl methacrylate-ran-glycidyl methacrylate) blend with mono-carboxylated polystyrene as a compatibilizer

Abstract

The poly(methyl methacryiate)graft-polystyrene (PMMA-g-PS) copolymer formed in-situ from polystyrene (PS)/poly(methyl methacrylate-ran-glycidyl methacrylate) (PMMA-GMA) blend with monocarboxylated PS (PS-mCOOH) as an in-situ compatibilizer in molten state was characterized by using H-1-nuclear magnetic resonance spectroscopy and gel permeation chromatography. These analyses were done after the phase consisting of unreacted PMMA-GMA and PMMA-g-PS copolymer was successfully separated from the other phase consisting of PS and unreacted PS-mCOOH by solvent extraction. The copolymer concentration in total blend C-copolymer(blend) increased linearly with the initially added amount of PS-mCOOH. On the basis of the molecular weight of the PMMA-g-PS copolymer, we concluded that a single PS-mCOOH chain was on the average grafted onto a single PMMA-GMA chain, although PMMA-GMA has 12 reactive sites per chain.