Graft copolymerigation of methyl methacrylate(MMA) on sodium alginate (SA) was carried out in the acetone-water solution of various compositions using hydrogen peroxide as initiator. There was a critical concentration of acetone to form PWO (polymeric water in oil) and POW (polymeric oil in water) emulsion. The PWO emulsion was composed of the hydrophilic polymer SA as the dispersed phase and the hydrophobic polymer PMMA as the continuous phase, and the POW emulsion was composed of the reversed phase to PWO emulsion. Conversions of MMA and SA grafting and graft efficiency were decreased with the concentration of aceton, while the apparent activation energy increased. The great stability of emulsion containing SA would be owing to the formation of graft copolymer during polymerization as emulsifying agent and also to the remaining unreacted SA. The stability of emulsion was decreased with the concentration of MMA and hydrogen peroxide.

분산매로서 아세톤-물과 개시제로 과산화수계를 사용하여 methyl methacrylate(MMA)를 sodium alginate(SA)와 불균일계로 여러 중합조성 변화별로 graft중합하여 emulsion을 얻었다. 아세톤-물의 조성비에 따라 생성 emulsion의 형이 수중유계 및 유중수계로 되며 수중유계에서는 분산상의 소수성 PMMA와 연속상의 친수성 SA로 구성된 POW (polymeric oil in water in oil) emulsion이 얻어졌다. 아세톤 농도의 증가에 따라 MMA 전화율, graft율, SA 전화율 및 graft 효율이 모두 저하되었으며, 겉보기 활성화에너지는 증가함을 알았다. emulsion의 안정성은 amphiphathic 성질을 가진 graft polymer의 유화안정제 역할에 기인되는 것으로 생각되었으며, 방치 안정성 및 용매 안정성은 중합 시에 사용한 아세톤이 증가함에 따라 감소되었으며, MMA 및 H₂O₂ 농도의 증가에 따라 증가하였다.

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