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首页> 外文期刊>Journal of Applied Polymer Science >Dependence of morphological changes of polymer particles on hydrophobic/hydrophilic additives
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Dependence of morphological changes of polymer particles on hydrophobic/hydrophilic additives

机译：聚合物颗粒形态变化对疏水/亲水添加剂的依赖性

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Fairly uniform microspheres of poly(styrene-co-methyl methacrylate) were prepared by employing a microporous glass membrane [Shirasu porous glass (SPG)]. The single-step SPG emulsification, the emulsion composed mainly of monomers, hydrophobic additives, and an oil-soluble initiator, suspended in the aqueous phase containing a stabilizer and inhibitor, was then transferred to a reactor, and subsequent suspension polymerization followed. The droplets obtained were polymerized at 75 degrees C under a nitrogen atmosphere for 24 h. The uniform poly(styrene-co-methyl methacrylate) microspheres with diameters ranging from 7 to 14 mu m and a narrow particle-size distribution with a coefficient of variation dose to 10% were prepared by using SPG membrane with a pore size of 1.42 mu m. The effects of the crosslinking agent and hydrophobic additives on the particle size, particle-size distribution, and morphologies were investigated. It was found that the particle size decreased with a narrower size distribution when the additives were changed from long-chain alkanes to long-chain alcohols and long-chain esters, respectively. Various microspheres with different morphologies were obtained, depending on the composition of the oil phase. The spherical poly(styrene-co-methyl methacrylate) particles without phase separation were obtained when using an adequate amount of the crosslinking agent and methyl palmitate as an additive. (C) 2000 John Wiley & Sons, Inc. [References: 20]
机译：通过使用微孔玻璃膜[Shirasu多孔玻璃（SPG）]制备聚（苯乙烯-甲基丙烯酸甲酯-共聚物）的相当均匀的微球。然后将悬浮在含有稳定剂和抑制剂的水相中的单步SPG乳化（主要由单体，疏水性添加剂和油溶性引发剂组成的乳液）转移到反应器中，随后进行悬浮聚合。将获得的液滴在氮气气氛下于75摄氏度聚合24小时。通过使用孔径为1.42μm的SPG膜制备直径为7至14μm，粒径分布窄，变异系数为10％的均匀聚（苯乙烯-甲基丙烯酸甲酯）微球。米研究了交联剂和疏水性添加剂对粒径，粒径分布和形态的影响。发现当添加剂分别从长链烷烃变为长链醇和长链酯时，粒度以较窄的粒度分布减小。根据油相的组成，获得了具有不同形态的各种微球。当使用足够量的交联剂和棕榈酸甲酯作为添加剂时，获得没有相分离的球形聚（苯乙烯-甲基丙烯酸甲酯共​​聚物）颗粒。 （C）2000 John Wiley＆Sons，Inc. [参考：20]

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