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Kinetic investigations of acrylic-polyurethane composite latex

机译：丙烯酸聚氨酯复合胶乳的动力学研究

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摘要

The effect of various reaction parameters on the rate of polymerization, R-p, and on the particle size and morphology of aqueous acrylic-polyurethane hybrid dispersions, prepared by semibatch emulsion polymerization, was investigated. The particles of polyurethane dispersion were used as seeds during the polymerization of acrylic component: methyl methacrylate (MMA), butyl acrylate (BA), and a mixture of MMA and BA with the ratio of 1:1. These emulsions were found to form structured polymer particles in aqueous media using scanning electron microscopy. The kinetics of the emulsion polymerization was studied on the basis of Wessling's model. The influence of emulsifier and initiator concentrations, including the monomer feed rates, R-m, on the rates of polymerization and on the properties of the resulting dispersions were studied. The number of particles and the particle size were also measured during the polymerization process. The final values were found to be independent of the concentration of the emulsifier, initiator and the monomer feed rate in monomer starved conditions. In the steady-state conditions, during the seeded semibatch hybrid emulsion polymerization, the rate of polymerization and the monomer feed rate followed the Wessling relationship 1/R-p = 1/K + 1/R-m. The dispersions MMA/PU, BA/PU, and MMA/BA/PU have K values of 0.0441, 0.0419 and 0.0436 mol/min, respectively. The seeded BA/PU hybrid polymerization proceeded according to Smith-Ewart Case I kinetics, while the MMA/PU hybrid emulsions demonstrate Case II of the Smith-Ewart kinetic model. (C) 2002 Wiley Periodicals, Inc. [References: 28]
机译：研究了各种反应参数对聚合速率，R-p以及通过半间歇乳液聚合制得的丙烯酸-聚氨酯杂化水性分散液的粒径和形态的影响。聚氨酯分散体的颗粒在丙烯酸成分：甲基丙烯酸甲酯（MMA），丙烯酸丁酯（BA）以及MMA与BA的比例为1：1的混合物聚合过程中用作种子。使用扫描电子显微镜发现这些乳液在水性介质中形成结构化的聚合物颗粒。在韦斯林模型的基础上研究了乳液聚合的动力学。研究了乳化剂和引发剂的浓度（包括单体进料速率R-m）对聚合速率和所得分散体性能的影响。在聚合过程中还测量了颗粒的数量和粒度。发现最终值与单体饥饿条件下的乳化剂浓度，引发剂和单体进料速率无关。在稳态条件下，在种子半间歇杂化乳液聚合过程中，聚合速率和单体进料速率遵循韦斯林关系1 / R-p = 1 / K + 1 / R-m。分散体MMA / PU，BA / PU和MMA / BA / PU的K值分别为0.0441、0.0419和0.0436 mol / min。接种的BA / PU杂化聚合反应根据Smith-Ewart Case I动力学进行，而MMA / PU杂化乳液则显示Smith-Ewart动力学模型的Case II。 （C）2002 Wiley Periodicals，Inc. [参考：28]

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