COAGULATIVE NUCLEATION AND PARTICLE-SIZE DISTRIBUTIONS IN EMULSION POLYMERIZATION
COAGULATIVE NUCLEATION AND PARTICLE-SIZE DISTRIBUTIONS IN EMULSION POLYMERIZATION
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DOI：
10.1021/ma00142a010
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发表时间：
1984-01-01
期刊：
影响因子：
5.5
通讯作者：
GILBERT, RG
中科院分区：
文献类型：
--
作者：
FEENEY, PJ;NAPPER, DH;GILBERT, RG
提出了基于前体颗粒凝结（其本身可以通过均匀成核或胶束进入形成）的乳液聚合系统中的成核动力学的详细理论。这些前体颗粒与真正的胶乳颗粒的不同之处在于聚合速率较慢并且缺乏抗凝结的稳定性。凝结成核理论将扩展的 Mtiller-Smoluchowski 凝结动力学与 DLVO 理论相结合。提供了成核速率、颗粒数量和颗粒尺寸分布 (PSD) 随时间演变的表达式。通过物理上合理的凝聚动力学参数值，与苯乙烯乳液聚合系统的数据一致。特别是，PSD 的早期演化获得了极好的一致性，此类数据对成核机制的假设特别敏感。此外，与颗粒数对表面活性剂和引发剂浓度的依赖性的数据也一致。
A detailed theory is presented for nucleation kinetics inemulsion polymerization systemsbased on the coagulation of precursor particles (which may themselvesbe formed by either homogeneous nucleation or micellar entry). These precursor particles differ from true latex particles by a slower rate of polymerization and the lack of stability against coagulation. The coagulative nucleation theory combines extended Mtiller-Smoluchowski coagulation kinetics with DLVO theory. Expressions are provided for the time evolutions of the nucleation rate, particle number, and particle size distribution (PSD). With physically reasonablevalues for the parameters for the coagulation kinetics, agreement is obtained with data for styrene emulsion po-lymerization systems. In particular, excellentaccord is obtained with the early-time evolution of the PSD, such data being especially sensitive to assumptions as to the nucleation mechanism. In addition, agreement is obtained with data on the dependence of particle number on surfactant and initiator concentrations.