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Experimental Study on the Synthesis of Iridescent Copolymers through Emulsion Polymerization | Bentham Science

机译：乳液聚合合成彩虹色共聚物的实验研究边沁科学

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Background: Polymeric materials self-assembled into three-dimensional opal structures maybe considered an interesting class of materials intended for photonic, chemical and biochemicalapplications.Objective: The present work focuses on the synthesis of iridescent copolymers with the basis of methylmethacrylate and methacrylic acid, exhibiting enhanced thermal properties due to the incorporation ofmethacrylic acid comonomer into the copolymer chains.Method: Methyl methacrylate / methacrylic acid copolymer was synthesized through batch emulsionpolymerization process. The morphology of iridescent copolymer particles has been evaluated throughscanning electron microscopy (SEM) and transmission electron microscopy (TEM), whereas the thermalfeatures have been evaluated by thermogravimetric measurements, differential scanning and calorimetry,and nuclear magnetic resonance (NMR) was been employed for the structural evaluation of(co)polymeric materials.Results: The copolymer presented iridescent characteristics, and as a result of particle self-assembly inthree-dimensional ordered structures, that led to the formation of macrocrystals, which is responsible foroptical effects, resulting in changes in polymeric material coloration. Microscopy analyses revealedspherical morphology of the polymeric particles, which exhibit monodisperse particle size, with 180 nmmean diameter. The particles were rigid at room temperature, and did not coalesce upon drying. Driedpolymer particles portrayed a hexagonal ordered structure of close packing of the smaller particles.Conclusion: Monodisperse poly(methyl methacrylate-co-methacrylic acid) nanoparticles exhibitingiridescent behavior have been successfully synthesized. Due to the methacrylic acid incorporation, theresulting copolymer material has been obtained with improved glass transition temperature and thermalstability.
机译：背景：自组装成三维蛋白石结构的高分子材料可能被认为是一类有趣的材料，适用于光子，化学和生化应用。目的：本工作集中在以甲基丙烯酸甲酯和甲基丙烯酸为基础的虹彩共聚物的合成上，方法：通过间歇乳液聚合法合成了甲基丙烯酸甲酯/甲基丙烯酸共聚物。通过扫描电子显微镜（SEM）和透射电子显微镜（TEM）对彩虹色共聚物颗粒的形貌进行了评估，而热特征通过热重测量，差示扫描和量热法进行了评估，并采用了核磁共振（NMR）。结果：该共聚物表现出虹彩特性，并且由于颗粒自组装的三维有序结构而导致形成大晶体，这是造成光学效应的原因，从而导致了光学性质的改变。聚合材料的着色。显微镜分析揭示了聚合物颗粒的球形形态，其表现出单分散粒径，平均直径为180nm。颗粒在室温下是刚性的，并且在干燥时不会聚结。干燥的聚合物颗粒呈现出较小颗粒紧密堆积的六边形有序结构。结论：已成功合成出具有虹彩行为的单分散聚（甲基丙烯酸甲酯-共-甲基丙烯酸）纳米颗粒。由于引入了甲基丙烯酸，因此获得了具有改善的玻璃化转变温度和热稳定性的结果共聚物材料。

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