特殊形态高分子微球负责纳米金的制备
Study on Preparation and Catalysis Property of Au Nanoparticles locted Polymeric Microspheres with unusual Morphology
本文通过链转移自由基聚合和端基置换反应合成了温敏性大分子单体聚N-异丙基丙烯酰胺(PNIPAAm)，以此为反应性稳定剂，与丙烯腈(AN)和苯乙烯(St)进行三元分散共聚，制得了粒径均一、具有特殊形态的PNIPAAm接枝PAN/PSt高分子微球。发现AN与St的比例、PNIPAAm大分子单体的用量对微球的大小与形态有明显的影响。以微球为载体，分别在50℃下进行热还原和15℃下进行自然光还原，使与PNIPAAm链配位的Au3+离子原位转变为Au纳米粒子。利用透射电子显微镜、X-射线衍射、傅立叶红外光谱及紫外-可见吸收光谱对还原前后的微球样品进行了表征，发现纳米金的粒径可控在2～26 nm。
his paper provides Poly(N-isopropylacrylamide) (PNIPAAm) macromonomer with a vinyl end group was obtained by free radical polymerization and end capping reaction. The PNIPAAm grafted polyacrylonitrile/ polystyrene microspheres having unusual morphologies can be prepared by dispersion copolymerization of AN with St by using PNIPAAm macromonomer as reaction stabilizer. The morphologies and particle size of the PNIPAAm-g-PAN/PSt microspheres can be controlled by changing ratio of AN to St and amount of PNIPAAm macromonomer. Then Au nanoparticles were located evenly onto surfaces of the PNIPAAm-g-PAN/PSt microspheres, which were prepared by in situ reduction of Au3+ at 50 ℃ or by sun light reduction at 15 ℃. The properties of Au nanoparticles located polymeric microspheres were studied by TEM, XRD, FTIR and UV-vis. It was found that the size of Au nanoparticles could be controlled between 2 to 26 nm.
周巧燕、熊万斌、刘晓亚、陈明清、倪忠斌
高分子化合物工业精细化学工业生物工程学
大分子单体高分子微球特殊形态纳米金催化活性
macromonomerpolymer microsphereunusual morphologyAu nanoparticle
周巧燕,熊万斌,刘晓亚,陈明清,倪忠斌.特殊形态高分子微球负责纳米金的制备[EB/OL].(2008-05-23)[2025-06-06].http://www.paper.edu.cn/releasepaper/content/200805-660.点此复制
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