Acta Chimica Sinica ›› 2002, Vol. 60 ›› Issue (6): 1129-1133. Previous Articles     Next Articles

Original Articles

种子乳液聚合中复合乳胶粒结构形态的热力学分析

阚成友;杜奕;刘德山;焦书科   

  1. 清华大学化工系材料科学与工程学院.北京(100084);北京化工大学高分子材 料科学与工程学院.北京(100029)
  • 发布日期:2002-06-15

Thermodynamic Analysis of Composite Latex Particle Morphologies in Seeded Emulsion Polymerization

Kan Chengyou;Du Yi;Liu Deshan;Jiao Shuke   

  1. Department of Chemical Engineering, School of Material Science and Engineering, Tsinghua University.Beijing(100084);School of Polymer Material Science and Engineering, Beijing University of Chemical Technology.Beijing(100029)
  • Published:2002-06-15

In order to get a quantitative method to predict and control the composite latex particle morphologies in seeded emulsion polymerization, a model system consisting of two polymer particles (P_a and P_b) and continuous phase of water was used to simulate the seeded emulsion polymerization system, and a thermodynamic analysis was conducted for three possible extreme morphologies of composite latex particles under the condition where kinetic factors were not considered. The results showed that the final stable latex particle morphology was controlled not only by interfacial tensions (γ_(aw), γ _(bw) and γ_(ab)) between three phases (polymer A, polymer B and water) , but also by the fraction volumes (V_a and V_b) of the two polymers. The thermodynamic requisites for the formation of P_a/P_b core/shell latex particle were (γ_(aw)-γ_(bw))/γ_(ab) > V_a~(2/3)-V_b~(2/3) and (γ_(aw)-γ_(ab))/γ_(bw) > (1-V_b~(2/3))/V_a~(2/3); and those for the formation of P_a/P_b core/shell latex particle were (γ_(aw)-γ_ (bw))/γ_(ab) < V_a~(2/3)-V_b~(2/3) and (γ_(bw)-γ_(ab))/γ_(aw) > (1- V_a~(2/3))/V_b~(2/3). When acrylate-silicone seeded emulsion polymerization system was used to test these relationships, preliminary experiment investigated that the particle morphology is basically agreement with the prediction results of thermodynamic analysis.

Key words: EMULSION POLYMERIZATION, LATEX, THERMODYNAMIC ANALYSIS, POLYACRYLATE, SILOXANE

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