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首页> 外文期刊>Journal of Applied Polymer Science >Size control of polystyrene beads by multistage seeded emulsion polymerization
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Size control of polystyrene beads by multistage seeded emulsion polymerization

机译：多级种子乳液聚合控制聚苯乙烯珠粒的尺寸

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摘要

Micron-sized monodisperse crosslinked polystyrene (PS) beads have been prepared by a multistage emulsion polymerization using styrene monomer, divinylbenzene crosslinking agent, and potassium persulfate initiator in the absence of emulsifier. In the first stage of the reaction, the lower the reaction temperature, the larger the bead size obtained. In the later stages of the reaction, the particle size is increased with the initiator concentration and monomer content. Particle nucleation of the preexisting polymer seed of 0.7-0.8 µm in diameter is prepared at 60 °C, then the monodisperse crosslinked PS beads>2 µm are synthesized up to the third stage of the reaction. As the particle size grows, the number of free radicals in the growing particles increases, and the conversion of the next stage is continuously increased. The reaction mechanism is suggested that the continuous polymerization be conducted due to the diffusion of monomer into the preexisting particles to induce spherical beads in the later stages of the reaction. Otherwise, phase separation or the formation of protrusion by the capture of free radicals will be taking place.
机译：在不存在乳化剂的情况下，使用苯乙烯单体，二乙烯基苯交联剂和过硫酸钾引发剂通过多阶段乳液聚合制备了微米级的单分散交联聚苯乙烯（PS）珠。在反应的第一阶段，反应温度越低，获得的珠粒尺寸越大。在反应的后期，粒径随着引发剂浓度和单体含量的增加而增加。在60°C下制备直径为0.7-0.8 µm的预先存在的聚合物种子的粒子核，然后合成单分散交联的PS珠> 2 µm，直至反应的第三阶段。随着粒度的增长，增长的粒子中自由基的数量增加，并且下一阶段的转化率不断提高。该反应机理被认为是由于单体扩散到预先存在的颗粒中而在反应的后续阶段中引发球形珠粒而进行的连续聚合。否则，将发生相分离或由于捕获自由基而形成突起。

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