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首页> 外文期刊>Journal of Applied Polymer Science >Monodispersed Composite Particles Prepared via Emulsifier-Free Emulsion Polymerization Using Waterborne Polyurethane as Microreactors
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Monodispersed Composite Particles Prepared via Emulsifier-Free Emulsion Polymerization Using Waterborne Polyurethane as Microreactors

机译：使用水性聚氨酯作为微反应器通过无乳化剂乳液聚合制备的单分散复合颗粒

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摘要

Monodispersed polystyrene particles in submicrometer size were intriguingly prepared through emulsifier-free batch-seeded emulsion polymerization using nonmonodispersed waterborne polyurethane (WBPU) beads as microreactors. Different feed ratios of styrene (St)/WBPU for the preparation of composite particles were investigated, and the size-growth course was experimentally followed. The morphology and dispersity of the particles were characterized by scanning electron microscopy together with dynamic laser scattering particle size analyzer. Their inside structure was further characterized by transmission electron microscopy with ultramicrotomy combined with X-ray photoelectron spectroscopy for the composite particles' surface analysis. The probable grafting polymerization of St from WBPU was verified by Fourier transform infrared spectroscopy and nuclear magnetic resonance instrument. The obtained composite particles were again employed as the seeds in the emulsion copolymerization of methyl methacrylate. As a result, the formed multilayered composite particles with reverse core-shell structure were also monodispersed and spherical. The mechanism of the formation of the monodispersed particles was proposed. VC 2014 Wiley Periodicals, Inc. J. Appl. Polym. Sci. 2014, 131, 40985.
机译：有趣的是，使用非单分散水性聚氨酯（WBPU）珠粒作为微反应器，通过无乳化剂的分批播种的乳液聚合反应制备了亚微米级的单分散聚苯乙烯颗粒。研究了不同的苯乙烯（St）/ WBPU进料比，以制备复合颗粒，并实验性地遵循了尺寸增长过程。通过扫描电子显微镜和动态激光散射粒度分析仪对颗粒的形貌和分散性进行了表征。它们的内部结构通过透射电子显微镜，超薄切片术和X射线光电子能谱进一步表征，用于复合颗粒的表面分析。用傅立叶变换红外光谱和核磁共振仪验证了WBPU中St可能的接枝聚合。将获得的复合颗粒再次用作甲基丙烯酸甲酯的乳液共聚中的种子。结果，形成的具有反向核-壳结构的多层复合颗粒也被单分散和球形。提出了单分散颗粒的形成机理。 VC 2014 Wiley Periodicals，Inc. J. Appl。 Polym。科学2014，131，40985。

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