Article
  • A Study on Synthesis and Properties of Composite Latex by Stage-Emulsion Polymerization : 2. Second-Stage Polymerization Rate and Molecular Weight of the PS Polymerized in the Second-Stage
  • Lee MK, Kim KU, Moon TJ
  • 단계적 유화중합에 의한 Composite Latex의 합성과 그 물성에 관한 연구: 2. 2단계 중합의 반응속도와 분자량
  • 이미경, 김광웅, 문탁진
Abstract
The second-stage styrene polymerization in the presence of poly(methyl methacrylate)(PMMA) core was evaluated. Surfactant-free emulsion polymerization was conducted with potassium persulfate as an initiator. The rate of polymerization and the molecular weight of polystyrene, polymerized in the second-stage, were observed to be increased with increasing amount of PMMA core. That might be explained by "gel effect". Reactions were affected by the gel effect from the beginning of the reaction, when the PMMA core/styrene ratios were 75/25 and 50/50.

유화제를 사용하지 않는 유화중합법을 이용하고 potassium persulfate를 개시제로 하여, poly(methyl methacrylate) (PMMA) core 존재하에서 행하는 2단계 styrene 중합반응을 고찰하였다. 2단계 중합반응 속도와 합성된 polystyrene의 분자량은 PMMA core 함량비가 클수록 증가하는데, 이는 반응입자 내에서의 단량체 비율이 작을수록 "gel effect"의 효과가 커지기 때문이다. 2단계 반응시작 때 단량체가 모두 core 입자내에 존재하는 PMMA core/styrene 조성비 75/25와 50/50의 경우에는 반응 초기부터 "gel effect"의 영향을 받고 있었다.

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  • Polymer(Korea) 폴리머
  • Frequency : Bimonthly(odd)
    ISSN 0379-153X(Print)
    ISSN 2234-8077(Online)
    Abbr. Polym. Korea
  • 2023 Impact Factor : 0.4
  • Indexed in SCIE

This Article

  • 1991; 15(6): 670-677

    Published online Dec 25, 1991