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首页> 外文期刊>Journal of Applied Polymer Science >High solids content emulsions. IV. Improved strategies for producing concentrated latices
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High solids content emulsions. IV. Improved strategies for producing concentrated latices

机译：高固含量乳液。 IV。生产浓缩胶乳的改进策略

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A new means of producing high solids content latices with low viscosity is presented. The replacement of water-soluble initiators that decompose to give charged free radicals is shown to perturb the stability of highly concentrated latices. Their replacement by an oil-soluble initiator during particle growth, then by an activated, water-soluble system to remove residual monomer has been shown to help significantly reduce the number of stable particles generated by homogeneous nucleation. Latices with 73% (v/v) solids have been produced with a bimodal particle size distribution (PSD) consisting of 900 and 110 nm particles. The viscosity of these latices can be as low as 300 mPa s(-1) at 20 s(-1). Despite the presence of water-soluble monomers, excellent control over the evolution of the PSD allows one to obtain highly reproducible results. In addition, latices produced with the new initiator system have a much lower water uptake and their viscosity is much less sensitive to changes in pH than is the case for latices produced using standard emulsion polymerization techniques. (C) 2002 Wiley Periodicals, Inc. [References: 13]
机译：提出了一种生产低粘度高固含量胶乳的新方法。分解分解成带电自由基的水溶性引发剂显示出扰乱了高浓度胶乳的稳定性。已显示它们在颗粒生长过程中被油溶性引发剂取代，然后被活化的水溶性系统取代以除去残留的单体，这有助于显着减少由均相成核产生的稳定颗粒的数量。已生产出固体含量为73％（v / v）的胶乳，其双峰粒度分布（PSD）由900和110 nm颗粒组成。这些胶乳的粘度在20 s（-1）时可低至300 mPa s（-1）。尽管存在水溶性单体，但对PSD演变的出色控制可以使人获得高度可再现的结果。此外，与使用标准乳液聚合技术生产的胶乳相比，使用新的引发剂系统生产的胶乳的吸水率低得多，并且其粘度对pH的变化敏感性较低。 （C）2002 Wiley Periodicals，Inc. [参考：13]

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