[Retraction] Preparation of Methyl methacrylate/styrene Core-shell Latex by Emulsion Polymerization

[논문 철회] 유화중합에 의한 Methyl methacrylate/styrene계 Core-shell 라텍스 입자 제조에 관한 연구

  • Kang, Don-O (Department of Chemical Engineering, Dong-A University) ;
  • Lee, Nae-Woo (Department of Safety Engineering, Pukyong National University) ;
  • Seul, Soo-Duk (Department of Chemical Engineering, Dong-A University) ;
  • Lee, Sun-Ryong (Department of Chemical Engineering, Dong-A University)
  • 강돈오 (동아대학교 공과대학 화학공학과) ;
  • 이내우 ;
  • 설수덕 (동아대학교 공과대학 화학공학과) ;
  • 이선룡 (동아대학교 공과대학 화학공학과)
  • Published : 2002.03.31

Abstract

Core-shell polymers of methyl methacrylate/styrene pair were prepared by sequential emulsion polymerization in the presence of sodium dodecyl benzene sulfonate(SDBS) as an emulsifier using ammonium persulfate(APS) as an initiator. The characteristics of these core-shell polymers were evaluated. Core-shell composite latex has the both properties of core and shell components in a particle, where as polymer blonds or copolymers show a combined properties from the physical properties or two homopolymers. This unique behavior of core-shell composite latex can be used in many industrial fields. However, in preparation of core-shell composite latex, several unexpected phenomina are observed, such as, particle coagulation, low degree of polymerization, and formation of new particles during shell polymerization. To solve the disadvantages, we studied the effects of surfactant concentrations, initiator concentrations, and reaction temperature on the tore-shell structure or PMMA/PSt and PSt/PMMA. Particle size and particle size distribution were measured by using particle size analyzer, and the morphology of the core-shell composite latex was observed by using transmission electron microscope. Glass transition temperature($T_g$) was also measured by using differential scanning calorimeter. To identify the core-shell structure, pH of the composite latex solutions were measured.

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