Gu S, Mogi T, Konno M
Department of Chemical Engineering, Tohoku University, Sendai, 980-8579, Japan
J Colloid Interface Sci. 1998 Nov 1;207(1):113-118. doi: 10.1006/jcis.1998.5768.
A single-stage polymerization technique, proposed for producing micron-sized polymer particles in aqueous media by Gu and Konno, was examined. Styrene was used for the monomer, potassium persulfate for the initiator, and cetyltrimethylammonium bromide and sodium dodecyl sulfate were used for the ionic surfactants to control the aggregation of the particles during the reaction. Particle-size distributions and monomer-to-polymer conversions were measured over a range of initiator concentration (2-8 mmol/dm3 H2O), stirring speed (200-400 rpm), surfactant addition time and monomer concentration (1.1-2.2 mol/dm3 H2O). Changes in the initiator concentration and stirring speed did not bring about significant effect on the particle-size distributions. On the other hand, the addition of time affected the coefficient of variation of the particle-size distribution, but it had no significant effect on the average diameter of the particles. An increase in the monomer concentration enlarged the average size without lowering the coefficient of variation of particle-size distribution. Monodisperse polystyrene particles with an average diameter of 3.3 µm and a coefficient of variation of particle size distribution 7% could be prepared with the present technique. Copyright 1998 Academic Press.
顾和康野提出的用于在水介质中制备微米级聚合物颗粒的单阶段聚合技术得到了研究。使用苯乙烯作为单体，过硫酸钾作为引发剂，十六烷基三甲基溴化铵和十二烷基硫酸钠作为离子表面活性剂，以控制反应过程中颗粒的聚集。在一系列引发剂浓度（2 - 8 mmol/dm³ H₂O）、搅拌速度（200 - 400 rpm）、表面活性剂添加时间和单体浓度（1.1 - 2.2 mol/dm³ H₂O）范围内测量了粒径分布和单体到聚合物的转化率。引发剂浓度和搅拌速度的变化对粒径分布没有显著影响。另一方面，添加时间影响粒径分布的变异系数，但对颗粒的平均直径没有显著影响。单体浓度的增加会增大平均尺寸，而不会降低粒径分布的变异系数。采用本技术可以制备平均直径为3.3 µm且粒径分布变异系数为7%的单分散聚苯乙烯颗粒。版权所有1998年学术出版社。
