首先将偶氮类引发剂引到纳米二氧化硅的表面,然后以此为引发剂,以甲基丙烯酸叔丁酯基二硫代萘甲酸酯(TNPBE)为链转移剂(CTA),进行甲基丙烯酸β-羟乙酯的可逆加成-断裂链转移(RAFT)自由基聚合,制备了甲基丙烯酸β-羟乙酯/纳米二氧化硅(PHEMA/nano-SiO_2)有机/无机杂化材料,并用红外光谱(FT-IR)、透射电镜(TEM)和热失重(TG)等方法对其结构和性能进行了表征与测试.研究结果表明,聚合物已经接枝到了纳米二氧化硅的表面,整个非均相体系中的聚合反应都是在链转移剂的作用下进行的,TG分析说明了此杂化材料的热稳定性良好.
A kind of organic/inorganic PHEMA/nano-SiO_2 hybrid material was prepared though reversible addition fragmentation chain transfer polymerization(RAFT) of 2-hydroxyethyl methacrylate (HEMA) using nano-silicon carried azo initiator as initiator and 2-thionaphthalenylsulfanyl-propionic acid t-butyl ester (TNPBE) as chain transfer agent (CTA). The microstructures and the properties were studied by Fourier transform infrared spectroscopy (FT-IR), transmission electron microscopy (TEM) and thermogravimetry analysis (TG), etc. The results indicate that the polymer has grafted from nano-silicon surface. The heterogeneous polymerization is carried out in the present of chain transfer agent (CTA). Meanwhile, TG results reveal that thethermal stability of the hybrid material is very well.
参考文献
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