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首页> 外文期刊>Journal of Applied Polymer Science >Preparation of uniform hollow polystyrene particles with large voids by a glass-membrane emulsification technique and a subsequent suspension polymerization
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Preparation of uniform hollow polystyrene particles with large voids by a glass-membrane emulsification technique and a subsequent suspension polymerization

机译：通过玻璃膜乳化技术和随后的悬浮聚合制备具有大空隙的均匀的中空聚苯乙烯颗粒

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Hollow polymer particles with large voids were prepared with styrene (St) as the main component and in the presence of a small amount of N,N'-dimethylaminoethyl methacrylate (DMAEMA) via a glass-membrane emulsification technique and a subsequent suspension polymerization. A mixture of the monomer, hexadecane (HD), and N,N'-azobis(2,4-dimethylvaleronitrile) as an initiator was used as a dispersed phase (oil phase). By the careful pushing of the dispersed phase through the pores of the glass membrane into the aqueous phase, an emulsion of fairly monodisperse monomer droplets was formed. Then, the polymerization was performed by temperature being elevated to 70degreesC. The aqueous phase (continuous phase) contained poly(N-vinyl pyrrolidone) as a stabilizer, sodium lauryl sulfate as a surfactant, Na2SO4 as an electrolyte, and sodium nitrite (NaNO2) as a water-soluble inhibitor. Results related to the effects of the HD content, DMAEMA, and the composition of the comonomer, including the crosslinker and flexible segment, on the features of the hollow particles were investigated. When the content of DMAEMA was higher than 1.0 wt% based on the total monomer, small, secondary particles were generated in the aqueous phase, but the generation was effectively prevented when DMAEMA was limited to 0.5 wt%. Hollow particles, with an average diameter of around 7 gm, were obtained with an St-DMAEMA system. The void size of the hollow particles was controlled by the HD content. When, the HD content was lower (<25 wt% based on the oil phase), unbroken hollow particles were easily obtained. However, they tended to break into halves after drying when the HD content was increased to 50 wt%. A soft segment, lauryl acrylate, and a crosslinker, ethylene glycol dimethacrylate, were added to overcome this problem. (C) 2002 Wiley Periodicals, Inc. [References: 18]
机译：经由玻璃膜乳化技术和随后的悬浮聚合，以苯乙烯（St）为主要成分并在少量N，N'-二甲基氨基乙基甲基丙烯酸甲酯（DMAEMA）存在下制备具有大空隙的空心聚合物颗粒。单体，十六烷（HD）和作为引发剂的N，N'-偶氮双（2,4-二甲基戊腈）的混合物用作分散相（油相）。通过小心地将分散相通过玻璃膜的孔推入水相，形成了相当单分散的单体液滴的乳液。然后，通过将温度升高至70℃进行聚合。水相（连续相）包含作为稳定剂的聚（N-乙烯基吡咯烷酮），作为表面活性剂的月桂基硫酸钠，作为电解质的Na 2 SO 4以及作为水溶性抑制剂的亚硝酸钠（NaNO 2）。研究了有关HD含量，DMAEMA和共聚单体组成（包括交联剂和柔性链段）对空心颗粒特征的影响的结果。当基于总单体的DMAEMA的含量高于1.0重量％时，在水相中产生小的次级颗粒，但是当将DMAEMA限制为0.5重量％时，有效地防止了该产生。使用St-DMAEMA系统可获得平均直径约为7克的空心颗粒。中空颗粒的空隙尺寸由HD含量控制。当HD含量较低时（基于油相＜25wt％），容易获得未破裂的中空颗粒。然而，当HD含量增加到50重量％时，它们倾向于在干燥后分成两半。为了解决该问题，添加了软链段丙烯酸月桂酯和交联剂乙二醇二甲基丙烯酸酯。 （C）2002 Wiley Periodicals，Inc. [参考：18]

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