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ROBUST NUCLEATION IN POLYMER-STABILIZED MINIEMULSION POLYMERIZATION

机译:聚合物稳定的微乳液聚合中的稳健核化

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The addition of a monomer soluble polymer to an emulsion was found to slow the effects of Ostwald ripening and impart diffusional stability to the droplets. Droplet nucleation was found to be the dominant nucleation mechanism in the polymerization of these polymer-stabilized miniemulsions (as distinguished from true miniemulsions). As a result these nucleations were more robust, and the polymerizations were less sensitive to variations in the recipe or contaminants levels. This was evident in the rates of polymerization and in the particle numbers. The miniemulsion polymerizations were subjected to changes in initiator concentration, a water-phase retarder, an oil-phase inhibitor, and agitation. Particle number was found to vary with each of these factors to the powers of 0.002, 0.02, 0.0031, and -0.026, respectively. The corresponding exponents for conventional emulsion were one to two orders of magnitude greater. These results demonstrate the potential of miniemulsion polymerization to greatly reduce the variability in particle number found in conventional emulsion polymerizations. (C) 1996 John Wiley & Sons, Inc. [References: 10]
机译:发现将可溶于单体的聚合物加到乳液中减慢了奥斯特瓦尔德熟化的作用并赋予了液滴扩散稳定性。发现液滴成核是这些聚合物稳定的细乳液(与真正的细乳液不同)的聚合中的主要成核机理。结果,这些成核作用更加牢固,聚合反应对配方或污染物含量的变化较不敏感。这在聚合速率和颗粒数上是明显的。对细乳液聚合反应进行引发剂浓度,水相缓凝剂,油相抑制剂和搅拌的改变。发现颗粒数随这些因素中的每一个而变化,分别为0.002、0.02、0.0031和-0.026的幂。传统乳液的相应指数要大一到两个数量级。这些结果证明了细乳液聚合的潜力,可以极大地减少常规乳液聚合中发现的颗粒数目的变异性。 (C)1996 John Wiley&Sons,Inc. [参考:10]

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