Dispersion copolymerization of styrene and divinylbenzene: Synthesis of monodisperse, uniformly crosslinked particles
Dispersion copolymerization of styrene and divinylbenzene: Synthesis of monodisperse, uniformly crosslinked particles
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DOI：
10.1002/pola.1995.080330301
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发表时间：
1995-02
期刊：
影响因子：
--
通讯作者：
B. Thomson;A. Rudin;G. Lajoie
中科院分区：
文献类型：
--
作者：
B. Thomson;A. Rudin;G. Lajoie
采用分散技术制备了单分散的交联聚苯乙烯胶乳。提供了一些关于初始试剂浓度对最终粒径和粒径分布的影响的一般性观察，此外还详细讨论了在胶乳制备中使用交联剂二乙烯基苯（DVB）所遇到的问题。发现在极性很强的介质中合成的颗粒比在极性较低的环境中合成的颗粒更快达到其生长平台。这种趋势被认为是极性环境中更有效的成核的结果，这增加了可用的表面积，从而允许在聚合过程中快速替换颗粒相中消耗的单体。在反应过程中，试图有利地影响颗粒的生长速率和尺寸分布是不成功的，强调了成核期在定义颗粒尺寸特性中的重要性。通过在主要颗粒生长期间控制交联剂进入颗粒相，在无凝结物、单分散、5 μm珠粒的合成中成功掺入了高达1%的DVB。胶乳的稳定性在很大程度上取决于吸附的空间稳定剂的流动性。John Wiley & Sons，Inc.
Monodisperse, crosslinked polystyrene latexes were prepared by the dispersion technique. Some general observations regarding the effect of initial reagent concentrations on final particle size and size distribution are offered, in addition to a detailed discussion concerning the problems encountered with the use of the crosslinker divinylbenzene (DVB) in latex preparation. Particles synthesized in very polar media were found to reach their growth plateau sooner than those made in less polar surroundings. This trend was proposed to be the result of more effective nucleation in polar environments, which increases available surface area, thereby allowing the rapid replacement of monomer consumed within the particle phase during the polymerization. Attempts to favorably influence the growth rate and size distribution of particles during the reaction were unsuccessful, underlining the importance of the nucleation period in defining particle size characteristics. Up to 1% DVB was successfully incorporated in the synthesis of coagulum-free, monodisperse, 5 μm beads, by controlling the entry of the crosslinker into the particle phase during the major particle growth period. Latex stability is proposed to be largely dependent on the mobility of the adsorbed steric stabilizer. © 1995 John Wiley & Sons, Inc.