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首页> 外文期刊>Journal of Applied Polymer Science >High solid content multisized emulsion copolymerization of styrene, butyl acrylate, and methacrylic acid
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High solid content multisized emulsion copolymerization of styrene, butyl acrylate, and methacrylic acid

机译：苯乙烯，丙烯酸丁酯和甲基丙烯酸的高固含量多元乳液共聚

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Polymer lattices with a multimodal particle size distribution (PSD) polymer latex were prepared by introducing additional surfactants during the semicontinuous emulsion polymerization of styrene, butyl acrylate, and methacrylic acid. The polymerization was investigated by following the variation of the particle size, the size distribution, the number of particles, the T-g of the different particle sizes, and the total conversion at different steps of the polymerization process. The results show that bimodal and trimodal PSD polymer lattices can be obtained by this method and that the secondary generation of particles is greatly influenced by the nature and the amount of additional surfactants, as well as the moment when they are introduced. When the amount of additional surfactants is increased, the diameters of both the small and large particles decrease and the number of particles in each of the populations increases. Earlier introduction of these surfactants favors the generation and the growth of the small particles and thereby leads to a reduction of the relative fraction of large particles in the final latex. On introduction of 7 wt % of additional surfactants, based on the total monomers, 100% of the monomers of the second-stage polymerization were consumed to form the small particles. This fraction decreases with a decreasing amount of the additional surfactants. These results were further demonstrated by measuring the T-g's of both the large and the small particles of two lattices, in which the T-g's of the copolymers produced in each of the stages were different. High solid content (>65%), low viscosity, and coagulum-free lattices have been obtained through secondary nucleation, and a minimum in viscosity was found when the weight fraction of the large particles was around 80%. (C) 1998 John Wiley & Sons, Inc. [References: 14]
机译：通过在苯乙烯，丙烯酸丁酯和甲基丙烯酸的半连续乳液聚合过程中引入其他表面活性剂，可以制备具有多峰粒度分布（PSD）聚合物胶乳的聚合物晶格。通过跟踪粒度，粒度分布，颗粒数，不同粒度的T-g以及聚合工艺不同步骤的总转化率的变化来研究聚合。结果表明，通过该方法可以获得双峰和三峰PSD聚合物晶格，并且颗粒的二次生成受到附加表面活性剂的性质和数量以及引入时间的影响。当增加额外的表面活性剂的量时，小颗粒和大颗粒的直径都减小，并且每个群体中的颗粒数量增加。这些表面活性剂的较早引入有利于小颗粒的产生和生长，从而导致最终胶乳中大颗粒的相对分数降低。在引入7重量％的额外表面活性剂时，基于总单体，第二阶段聚合的100％的单体被消耗以形成小颗粒。该分数随着附加表面活性剂的减少而减少。通过测量两个晶格的大颗粒和小颗粒的T-g值进一步证明了这些结果，其中在每个阶段中生产的共聚物的T-g值都不同。通过二次成核获得了高固含量（> 65％），低粘度和无凝结晶格，当大颗粒的重量分数约为80％时，粘度最小。 （C）1998 John Wiley＆Sons，Inc. [参考：14]

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