Interfacial and Turbulent Mass Transfer of Monomers into Latex Particles Stabilized with Mixed Surfactants and Water-Soluble Polymer

研究摘要：将研究小有机分子吸附在乳胶颗粒上，通过表征良好的界面膜的质量传输。“冷凝”型界面膜，即吸附分子之间具有强相互作用的界面膜，如十六烷基硫酸钠/十六烷基醇钠混合表面活性剂或高离子强度的十二烷基硫酸钠。搅拌对质量输运的影响也将被研究。提出的工作旨在了解通过界面中紧密堆积的分子的质量传输。大多数研究都是在液滴上进行的，其中运输阻力是由于液滴表面附近液体再循环减少。在这项工作中，衬底是聚合物颗粒，不存在再循环效应。质量传递阻力必须依赖于界面膜的阻挡特性。技术影响：在商业乳胶制造中，胶体稳定通常基于混合稳定剂，离子/非离子表面活性剂混合物，这通常会导致分子紧密堆积的界面层。为了对商业反应进行有效的动力学建模，需要关于在紊流搅拌状态下通过这一阶段的质量输运的信息。目前还没有这方面的资料。这项工作将提供一些缺失的信息。

Research Summary: Mass transport of small organic molecules through well characterized interfacial films, adsorbed on latex particles, will be studied. Interfacial films of the "condensed" type, those with strong interactions between adsorbed molecules such as the sodium hexadecyl sulfate/sodium hexadecyl alcohol mixed surfactants or sodium lauryl sulfate at high ionic strength, will be used. The effect of agitation on the mass transport will be also studied. The proposed work is aimed toward the understanding of mass transport through tightly packed molecules in the interface. Most studies have been on liquid drops, where the transport resistance was due to the reduced liquid recirculation near the surface of the drop. In this work the substrate is a polymer particle and recirculation effects are absent. The mass transport resistance must than depend on the barrier properties of the interfacial film. Technical Impact: In commercial latex manufacture, colloid stabilization is often based on mixed stabilizers, ionic/nonionic surfactant mixtures, which often lead to interfacial layers of tightly packed molecules. Information about the mass transport through such a phase in the turbulent agitation regime is needed for the effective kinetic modeling of commercial reactions. Such information is currently not available. This work will yield some of this missing information.