文献类型： 外文期刊

第一作者： Kang, K

作者： Kang, K;Kan, CY;Du, Y;Li, YZ;Liu, DS

作者机构：

关键词： soap-free emulsion polymerization;particle size and its distribution;particle size control;methyl methacrylate based copolymer

期刊名称：ACTA POLYMERICA SINICA （ 影响因子：2.0； 五年影响因子：1.391 ）

ISSN： 1000-3304

年卷期： 2004 年 4 期

页码：

收录情况： SCI

摘要： The control of particle size and its distribution has become more and more important both in theory and in practice in emulsion polymerization field. In this study, emulsion polymerization of methyl methacrylate (MMA), ethyl acrylate ( EA) and acrylic acid ( AA) was carried out in the absence of emulsifier, and the influences of ingredients and conditions on polymerization, latex particle size and its distribution were investigated, and latex particles with narrow size distribution as well as with carboxyl groups on their surface were synthesized. The results showed that the high monomer conversion and narrow latex particle size distribution were obtained when large amount of initiator (APS) was introduced into the polymerization system at the beginning in three-step addition process. With the increase of APS and AA,the particle size decreased and the monomer conversion increased,and a similar result was also observed with the temperature increase. It was found that NH4 HCO3 is a key material for the control of particle diameter (D-p). D-P increased with the increase of amount of NH4 HCO3, and the D-p of monodispersed P(MMA-EA-AA) latex particles can be well controlled in the range from 300 to 600 nm by adjusting the amount of NH4HCO3 used. Moreover, latexes with high monomer conversion and narrow particle size distribution can be obtained when a moderate stirring rate of 300 r/min was selected.

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