Aqueous phase properties on governing particle coagulation and mechanism nucleation in one-step emulsion polymerization of styrene
Aqueous phase properties on governing particle coagulation and mechanism nucleation in one-step emulsion polymerization of styrene
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苯乙烯一步乳液聚合中水相特性对颗粒凝聚和成核机理的影响
DOI：
10.1080/10601325.2019.1680254
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发表时间：
2020-03
期刊：
影响因子：
--
通讯作者：
Mingyao Zhang
中科院分区：
文献类型：
--
作者：
Baijun Liu;Fuquan Jiang;Chen Jiayu;Ye Han;Yang Bai;Mingyao Zhang
众所周知，改变连续相的性质对成核机理和粒径有很大的影响，而添加电解质或醇是控制溶液相性质的主要手段。本研究通过添加不同种类和含量的K2 CO 3和醇类进行聚苯乙烯乳液聚合实验，研究溶液相性质影响粒子生长过程的本质原因以及电解质和醇类之间的协同作用。在甲醇-水聚合体系中，当K2 CO 3含量为0.6wt%时，随着甲醇含量的增加，聚苯乙烯乳胶粒的粒径明显增大，而当K2 CO 3含量为0.1wt%时，粒径变化不明显。对于不同链长的醇，其粒径大小为：D丙醇（212.6 nm）>乙醇（123.1 nm）> D甲醇（90.75 nm）。结果表明，向溶液中加入乙醇可以通过降低连续相的介电常数来促进颗粒凝聚。结果表明，通过改变水相组成控制粒子的凝聚，可以获得大粒径的聚苯乙烯乳胶粒子。
Abstract As is well known, changing continuous phase properties has a great influence on the nucleation mechanism and particle size, and the addition of electrolytes or alcohol is the main mean to control the properties of solution phase. In this study, a series of experiments about polystyrene emulsion polymerization were produced by adding K2CO3 and alcohols in different types and contents, so as to study the essential reasons for the influence of solution phase properties on the growth process of particles and the synergistic effect between electrolytes and alcohols. In the presence of methanol-water polymerization systems, the particle size of polystyrene latex particles was enlarged obviously with the increase of methanol content when 0.6 wt% K2CO3 was contained, but there are no significant changes for the particle size with 0.1 wt% K2CO3. For the alcohols with different chain lengths, the particle diameters as follows: Dpropanol (212.6 nm) > Dethanol (123.1 nm) > Dmethanol (90.75 nm). They indicate that adding alcohol to the solution could promote particle coagulation by reducing dielectric constant of the continuous phase. As a result, the polystyrene latex particles with large-scale particle size can be acquired using controlling particle coagulation by changing aqueous phase composition.
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