Emulsion polymerization of styrene: Simulation the effects of mixed ionic and non-ionic surfactant system in the presence of coagulation
Emulsion polymerization of styrene: Simulation the effects of mixed ionic and non-ionic surfactant system in the presence of coagulation
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DOI：
10.1016/j.ces.2011.10.063
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发表时间：
2012-02
影响因子：
4.7
通讯作者：
Samira Feiz;A. H. Navarchian
中科院分区：
文献类型：
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作者：
Samira Feiz;A. H. Navarchian
建立了间歇式反应器中苯乙烯乳液聚合的详细模型，以预测产物粒度分布的演变。研究了不同组成的二元表面活性剂体系（离子/非离子表面活性剂）的效果。成核速率采用0 - 1动力学，模型由一组严格发展的种群平衡方程组成。该模型结合了成核和凝聚现象形成的颗粒。用有限体积元对描述粒子居数的偏微分方程进行离散。以十二烷基硫酸钠（SDS）为阴离子表面活性剂，以商业聚醚多元醇（Brij35®）为非离子表面活性剂，以不同的质量比对二元表面活性剂体系进行了研究。在二元表面活性剂体系中，随着非离子表面活性剂质量分数的增加，颗粒间的混凝作用增强，颗粒数量减少。与阴离子表面活性剂相比，非离子表面活性剂的粒径分布更宽，平均粒径更大。
A detailed model was developed for emulsion polymerization of styrene in batch reactor to predict the evolution of the product particle size distribution. The effect of binary surfactant systems (ionic/non-ionic surfactants) with different compositions was studied. The zero–one kinetics was employed for the nucleation rate, with the model comprising a set of rigorously developed population balance equations. The modeling incorporated particle formation by both nucleation and coagulation phenomena. The partial differential equations describing the particle population were discretized using finite volume elements. Binary surfactant systems, comprising sodium dodecyl sulfate (SDS) as anionic, and a commercial polyether polyol (Brij35®)as non-ionic surfactants, were examined with different mass ratios. Increasing non-ionic surfactant mass fraction in binary surfactant system showed the decrease of particle number due to intensifying the coagulation between particles. Broader particle size distributions with greater average particle size were obtained with non-ionic surfactant comparing those obtained with anionic one.