Effect of electrolyte species on size of particle through soap-free emulsion polymerization of styrene using AIBN and electrolyte
Effect of electrolyte species on size of particle through soap-free emulsion polymerization of styrene using AIBN and electrolyte
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DOI：
10.1007/s00396-015-3511-1
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发表时间：
2015-01
影响因子：
2.4
通讯作者：
Tetsuya Yamamoto;K. Kawaguchi
中科院分区：
文献类型：
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作者：
Tetsuya Yamamoto;K. Kawaguchi
在油溶性引发剂偶氮二（2-甲基丙腈）（AIBN）的无皂乳液聚合中加入电解质，有利于制备微米级聚苯乙烯粒子。为了研究电解质种类对颗粒尺寸的影响，我们重点研究了颗粒合成过程中阳离子的反离子和离子半径。结果，由于酸的酸解离常数的顺序为HCl <HNO 3 <CH 3COOH，因此使用氯化物盐的悬浮液具有较低的pH，并且由于凝聚生长过程而包括较大的颗粒。离子半径较大的阳离子由于水合作用较弱，具有减小负电荷聚苯乙烯粒子双电层厚度的能力，因此对粒子生长有较强的促进作用。总之，在聚合反应中加入阳离子半径较大的强酸性盐可以有效地增大聚苯乙烯的粒径。
The addition of electrolyte to a soap-free emulsion polymerization using oil-soluble initiator, 2,2′-azobis(2-methylpropionitrile) (AIBN), was useful for production of the micron-sized polystyrene particle. To investigate the effect of electrolyte species on particle size, we focus on the counter ion and ionic radius of the cation during the synthesis of the particle. As a result, because the order of acid dissociation constant of the acid was HCl < HNO3< CH3COOH, the suspension using chloride salt has lower pH and included the larger particles due to the coagulation growth process. Cation with a larger ionic radius could promote the particle growth strongly because its hydration was so weaker that it had the ability to reduce the thickness of the electrical double layer of negatively charged polystyrene particle. In summary, the addition of strongly acidic salt with larger cationic radius to the polymerization was efficient for making the size of polystyrene particle larger.