Synthesis of micron-sized polymeric particles in soap-free emulsion polymerization using oil-soluble initiators and electrolytes
Synthesis of micron-sized polymeric particles in soap-free emulsion polymerization using oil-soluble initiators and electrolytes
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DOI：
10.1007/s00396-012-2618-x
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发表时间：
2012-07-01
影响因子：
2.4
通讯作者：
Yamamoto, Tetsuya
中科院分区：
文献类型：
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作者：
Yamamoto, Tetsuya
研究了使用油溶性引发剂和电解质进行苯乙烯无皂乳液聚合以合成微米级聚苯乙烯颗粒。很明显，油溶性引发剂（例如AIBN）在苯乙烯无皂乳液聚合中像水溶性引发剂一样发挥作用，制备带负电荷的单分散颗粒，这可能是因为引发剂分解的吸电子官能团和苯乙烯单体中苯的π电子云的极化。添加电解质使二次颗粒能够通过减少双电层和防止自身生长来有效促进异质凝结，从而促进颗粒生长。通过改变电解质的浓度和类型，我们能够在使用 AIBN 的苯乙烯无皂乳液聚合中将尺寸控制在 12 μm 以内。传统上，有机溶剂和表面活性剂已用于制备微米级聚合物颗粒，但该方法使得能够使用不含表面活性剂的电解质在水中合成微米级聚合物颗粒。
Soap-free emulsion polymerization of styrene using oil-soluble initiators and electrolytes was investigated to synthesize micron-sized polystyrene particles. It was clear that an oil-soluble initiator, such as AIBN, worked like a water-soluble initiator in soap-free emulsion polymerization of styrene to prepare monodispersed particles with negative charges, probably because of the polarization of the electron-attractive functional groups decomposed from the initiators and the pi electron cloud of benzene in a styrene monomer. The addition of an electrolyte enabled secondary particles to effectively promote hetero-coagulation for particle growth by reduction of an electrical double layer and prevention of self-growth. Changing the concentration and type of electrolyte enabled us to control the size up to 12 mu m in soap-free emulsion polymerization of styrene using AIBN. Conventionally, organic solvents and surfactants have been used to prepare micron-sized polymeric particles, but this method enabled the synthesis of micron-sized polymeric particles in water using electrolytes without surfactants.