Article
  • A Study on Synthesis and Properties of Composite Latex by Stage-Emulsion Polymerization : 1. Particle Morphology
  • Lee MK, Kim KU, Moon TJ
  • 단계적 유화중합에 의한 Composite Latex의 합성과 그 물성에 관한 연구: 1. 입자 Morphology
  • 이미경, 김광웅, 문탁진
Abstract
Poly(methyl methacrylate) (PMMA)/polystyrene (PS) and poly(butyl acrylate) (PBA)/PS composite latices were prepared by surfactant-free, two-stage emulsion polymerization with potassium persulfate as an initiator, and the particle morphology of thus synthesized composite latices was studied. The heterogeneous morphologies, such as raspberry and confetti-like, were observed ; (1) when less hydrophilic PS was polymerized in the second stage onto more hydrophilic PMMA core or (2) PS was polymerized in the second stage onto hydrophobic core, PBA, which has Tg value much lower than reaction temperature(70℃). Transformation of latex morphology occurred to a higher degree when molecular weight or viscosity of core polymer was low, possibly due to increased mobility of core polymer molecules.

유화제를 사용하지 않는 2단계 유화중합법을 이용하고 potassium persulfate를 개시제로 하여 합성한 poly(methyl methacrylate)(PMMA)/polystyrene(PS)계와 poly(butyl acrylate)(PBA)/PS계의 입자 morphology를 연구하였다. Raspberry, confetti-like와 같은 이상 morphology의 형성은 PMMA core의 경우에는 PMMA의 hydrophilicity가 2단계에서 중합되는 PS보다 크기 때문이며, PBA core의 경우에는 2단계 반응온도가 PBA의 Tg에 비해 크게 높기 때문으로 여겨진다. 또한 core분자량이 작거나 core내 단량체 농도가 높아 core의 점도가 낮아지면, 중합체 분자의 이동이 활발하게됨으로써 composite 입자내에서의 상분리(phase separation)가 크게 일어났다.

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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(5): 563-569

    Published online Oct 25, 1991