Soap-Free Emulsion Polymerization of Poly(styrene acrylate) by Semi-Continuous System
Yun SH, Shim JS
무유화제 유화중합에 의한 Styrene-Acrylate계 라텍스
윤성호, 심정섭
Abstract
Poly(styrene-methylmethacrylate), poly(styrene-methylacrylate) and poly(styrene-2-hydroxyethylmethacrylate) were prepared by the semi-continuous soap-free emulsion polymerization method. In these syntheses, the feeding time of more hydrophobic monomer, i.e., styrene was 2 hours. The stability of latices determined by the sedimentation rate method was high. Average molecular weights of sample latices were 105-106 order, and molecular weight distributions of copolymer latices were comparatively narrow. Particle size of dried latex determined by SEM was larger than that of batch type polymer. Kinetics of semi-continuous soap-free emulsion polymerization was investigated in the synthesis of poly(styrene-methylmethacrylate) latex. In semi-continuous system generally, the initial rate of polymerization was low, but entire kinetics was similar to that of general emulsion polymerization. Total activation energy was 17.13 kcal. mol-1.
Polymer(Korea) 폴리머
Frequency : Bimonthly(odd) ISSN 0379-153X(Print) ISSN 2234-8077(Online) Abbr. Polym. Korea