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Citation: KANG Kai, KAN Cheng-You, DU Yi, LIU De-Shan. Influences of Polymerization Technology and m(MMA)/m(EA) on the Soap-free Emulsion Polymerization of MMA-EA-AA and Their Latex Particle Properties[J]. Chinese Journal of Applied Chemistry, ;2004, 21(7): 660-663. shu

Influences of Polymerization Technology and m(MMA)/m(EA) on the Soap-free Emulsion Polymerization of MMA-EA-AA and Their Latex Particle Properties

1.
Department of Chemical Engineering, School of Materials Science and Engineering, Tsinghua University, Beijing 100084

Corresponding author: KAN Cheng-You,
Received Date: 29 August 2003
Available Online: 8 December 2003
Fund Project: 国家"八六三"计划资助课题(2001AA242041) (2001AA242041)

Soap-free emulsion polymerization of methyl methacrylate (MMA),ethyl acrylate (EA) and acrylic acid (AA) has been carried out.The effects of technology and the mass ratio of MMA to EA on the polymerization and latex properties were investigated.The distribution of-COOH in the latex was determined by conductometric titration.The results showed that the monomer conversion and the amount (S_a) and density (S_d) of surface-COOH increased,and particle diameter (D_p) and the amount of embedded-COOH (E_a) decreased with the increase of temperature.With stirring rate being increased,the monomer conversion,S_a,E_a and E_a decreased,and D_p and F_a(amount of-COOH in water phase) increased;S_a and S_d increased and E_a decreased with m(MMA)/m(EA) decreased.When polymerization was carried out at 80℃,300 r/min and m(MMA)/m(EA) was 19,the properties of resulted latex was best:monomer conversion was 97.51%,D_p was 306 nm and in the narrowest distribution,the S_d was 1.01×10¹⁵/cm².
- methyl methacrylate,
- ethyl acrylate,
- acrylic acid,
- soap-free emulsion polymerization
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