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首页> 外文期刊>Macromolecular symposia >Micron-Sized Polymer Particles by Membrane Emulsification
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Micron-Sized Polymer Particles by Membrane Emulsification

机译：通过膜乳化的微米级聚合物颗粒

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Dispersions of micron-sized styrene droplets in water were produced by straight through microchannel arrays. The monomer droplets have been polymerized by suspension polymerization using an initiator system, which was only oil soluble. A significant amount of submicron particles was formed by secondary nucleation. The side reaction was emulsion polymerization, which was confirmed by the molecular weight distribution of the reaction product. Suppression of secondary nucleation was only partially possible by using the water soluble inhibitor NaNO_2. Increasing the monomer to water ratio before polymerization resulted in less emulsion polymerization. Molecular weight was found to be strongly dependent on the initiator concentration as well as on the inhibitor concentration. It was demonstrated that polymer particles with a diameter of about 10 mm can be produced using emulsification of the monomer by microchannel arrays prior to polymerization.
机译：微米级苯乙烯液滴在水中的分散是通过直接通过微通道阵列产生的。使用仅油溶性的引发剂体系通过悬浮聚合使单体液滴聚合。通过二次成核形成大量的亚微米颗粒。副反应是乳液聚合，这由反应产物的分子量分布证实。通过使用水溶性抑制剂NaNO_2，只能部分地抑制二次成核。在聚合之前增加单体与水的比例导致较少的乳液聚合。发现分子量强烈依赖于引发剂浓度以及抑制剂浓度。已经证明，在聚合之前，通过微通道阵列使用单体的乳化可以生产出直径约10mm的聚合物颗粒。

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