New insights on in situ charge neutralization governing particle size distribution in macroemulsion polymerization
New insights on in situ charge neutralization governing particle size distribution in macroemulsion polymerization
复制标题
关于原位电荷中和控制粗乳液聚合中粒径分布的新见解
DOI：
10.1016/j.colsurfa.2018.01.020
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发表时间：
2018-03
期刊：
影响因子：
--
通讯作者：
Zhang Huixuan
中科院分区：
文献类型：
--
作者：
Liu Baijun;Fu Zhongyu;Meng Wenting;Chen Ming;Wu Guangfeng;Zhang Mingyao;Zhang Huixuan
粗乳液聚合是制造单分散聚合物颗粒最广泛使用的方法。在聚合过程中，颗粒成核在决定最终颗粒的粒度分布方面起着关键作用。一般来说，离子低聚自由基和胶束之间的排斥增强颗粒成核，导致更小的颗粒尺寸。本研究以甲基丙烯酰氧基乙基三甲基氯化铵（MATMAC）和2′偶氮二（2甲基丙脒）二盐酸盐（AIBA）为阳离子物种，屏蔽十二烷基硫酸钠胶束的负电荷，诱导成核期的原位电荷中和，进一步减少颗粒数量，增大最终乳胶颗粒的粒径。 MATMAC或AIBA体系的最终粒径达到~200nm，比不含任何阳离子物种的粒径大2倍。此外，这些系统获得了窄的粒度分布。阳离子物质和表面活性剂分子之间的原位电荷中和增强了胶束的低聚物自由基捕获率，进一步缩短了颗粒成核时间并诱导初级颗粒凝聚。
Macroemulsion polymerization is the most widely used approach for the fabrication of the monodisperse polymer particles. During the polymerization process, particle nucleation plays a critical role in determining particle size distribution of the ultimate particles. In general, the repulsion between ionic oligomeric radicals and micelles enhances particle nucleation, resulting in smaller particle sizes. In this study, methacryloxyethyltrimethyl ammoniumchloride (MATMAC) and 2′azobis (2methylpropionamidine) dihydrochloride (AIBA) were used as the cationic species to shield the negative charges of sodium dodecyl sulfate micelle, inducingin situcharge neutralization in the nucleation period, and further decreasing the particle number, enlarging the particle size of the ultimate latex particles. The ultimate particle size of MATMAC or AIBA system reached ~ 200 nm, which is the 2 times bigger than that without any cationic species. Moreover, a narrow particle size distribution was obtained for these systems. Thein situcharge neutralization between the cationic species and surfactant molecules enhanced the oligomeric radical capture rate of micelles, further narrowing the particle nucleation time and inducing primary particle coagulation.
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