Semibatch emulsion polymerization of butyl acrylate stabilized by a polymerizable surfactant

被引:23
作者
Chern, CS
Chen, YC
机构
[1] Department of Chemical Engineering, Natl. Taiwan Institute of Technology
关键词
emulsion polymerization; polymerizable surfactant; semibatch; latex particle size; butyl acrylate;
D O I
10.1295/polymj.28.627
中图分类号
O63 [高分子化学(高聚物)];
学科分类号
070305 ; 080501 ; 081704 ;
摘要
In the semibatch emulsion polymerization of butyl acrylate (BA), the polymerizable surfactant, sodium dodecyl allyl sulfosuccinate (JS-2), increases the particle surface charge density significantly and, thereby, reduces particle size (as small as 90 nm) of the latex product. Such a small particle size has not been achieved by means of the surfactant-free technique (normally greater than 300 nm). The concentration of JS-2 in the initial reactor charge ([JS-2](i)) is the most important parameter in determining the final latex particle size (d(p)). The number of latex particles formed is proportional to [JS-2](i) to the 0.72-0.80 power. The experimental data also show that JS-2 should lay a similar role in particle nucleation and growth to the conventional surfactant sodium dodecyl sulfate. The saturated particle surface area occupied by one molecule of JS-2 is 0.36 nm(2) for the latex prepared by the surfactant-free technique. Furthermore, the saturated particle surface area covered by one molecule of JS-2 increases with particle surface polarity for the JS-2 stabilized latices. The fraction of the chemically incorporated JS-2 buried inside the particles increases with d(p).
引用
收藏
页码:627 / 632
页数:6
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