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Study on morphology, molecular weight and thermal properties of composite microspheres prepared by controlling feeding ways and reaction time

机译:通过控制饲料方式和反应时间制备复合微球的形态学,分子量和热性能研究

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The application of composite microspheres closely lies on their morphology and properties. In this work, carbon nanotubes (CNTs) reinforced composite microspheres were prepared via in situ polymerization: methyl methacrylate was selected as matrix to copolymerize with cationic comonomer 2-(methacryloyloxy)ethyltrimethyl ammonium chloride, using CNTs as nanofillers to fabricate composite microspheres. The morphology, molecular weight, and thermal properties of obtained composite microspheres with different monomer feeding ways (batch polymerization and dropwise monomer feeding procedure) and reaction time (1-6 h) were investigated. The results revealed that dropwise monomer feeding procedure leaded to remarkably decreased diameter of composite microspheres. Compared with polymer microspheres, the addition of CNTs resulted in earlier formation of composite microspheres. When the reaction time was controlled for 1-6 h, the morphology of the composite microspheres underwent a shape change from deformed particles to spherical structure. Although reaction time had no significant effect on molecular weight, the thermal property was gradually improved with increase of reaction time. For ensuring the effectiveness of the produced composite microspheres and tailoring them for any specific application, our investigation shows significant reference value on choosing feeding ways and controlling reaction time to obtain different morphology microspheres. (c) 2017 Wiley Periodicals, Inc. J. Appl. Polym. Sci. 2018, 135, 45741.
机译:复合微球的应用密切关注它们的形态和性质。在这项工作中,通过原位聚合制备碳纳米管(CNT)增强复合微球:选择甲基丙烯酸甲酯作为基质以与阳离子共聚单体2-(甲基丙烯酰氧基)乙基三甲基氯化铵共聚,用CNT作为纳米氧化物制备复合微球。研究了具有不同单体供给方式(分批聚合和滴加单体进料过程)和反应时间(1-6小时)的所得复合微球的形态学,分子量和热性能。结果表明,逐滴单体进料过程导致复合微球直径显着降低。与聚合物微球相比,加入CNT导致早期形成复合微球。当控制反应时间1-6小时时,复合微球的形态接受从变形颗粒到球形结构的形状变化。虽然反应时间对分子量没有显着影响,但随着反应时间的增加,热性逐渐改善。为了确保所生产的复合微球的有效性并针对任何特定应用定制它们,我们的研究表明了在选择饲养方式和控制反应时间以获得不同形态微球的显着参考值。 (c)2017 Wiley期刊,Inc.J.Phill。聚合物。 SCI。 2018,135,45741。

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