Particle size control in the soap-free emulsion polymerization of styrene by an oil-soluble initiator with a weakly acidic water-soluble initiator
Particle size control in the soap-free emulsion polymerization of styrene by an oil-soluble initiator with a weakly acidic water-soluble initiator
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DOI：
10.1016/j.colsurfa.2016.04.048
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发表时间：
2016-08
期刊：
影响因子：
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通讯作者：
Tetsuya Yamamoto;K. Kawaguchi;Yuya Takahashi
中科院分区：
文献类型：
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作者：
Tetsuya Yamamoto;K. Kawaguchi;Yuya Takahashi
以油溶性引发剂2，2 ′-偶氮二（2-甲基丙腈）（AIBN）和水溶性引发剂4，4 ′-偶氮二（4-氰基戊酸）（V-501）为引发剂，在水中进行苯乙烯无皂乳液聚合，以控制聚合物粒子的粒径。随着用于聚合的V-501的浓度变化，监测粒径和表面电位。当V-501浓度增加时，由于V-501是弱酸并降低了表面电位，因此粒径增加，从而通过凝聚促进颗粒生长。此外，V-501还可以作为自由基引发剂，提高聚合反应的效率，从而提高颗粒的数量浓度。
The soap-free emulsion polymerization of styrene by an oil-soluble initiator, 2,2′-azobis(2-methylpropionitrile) (AIBN), with a water-soluble initiator, 4,4′-azobis(4-cyanovaleric acid) (V-501), was conducted in water to control the size of the synthesized polymeric particles. The particle size and surface potential were monitored as concentration of V-501 used for the polymerization was varied. When the V-501 concentration was increased, the particle size increased because V-501 was a weak acid and reduced the surface potential, thereby promoting particle growth through coagulation. Additionally, V-501 can also function as a radical initiator, increasing the efficiency of the polymerization reaction and, thus, the number concentration of the particles.