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利用γ射线辐射接枝法分别制备甲基丙烯酸(Methacrylicacid,MAA)和甲基丙烯酸酯(Methylmethacrylate,MMA)两种单体接枝星型SBS聚合物,采用傅立叶红外光谱(Fouriertransforminfrared,FT?IR)、差示扫描热分析(Differentailscanningcalorimetry,DSC)、热重分析(Thermogravimetricanalysis,TGA)、核磁共振谱(13C{1H}Nuclearmagneticresonance,NMR)等手段对接枝聚合物进行了表征,确定了单体成功地引入SBS链上,同时发现SBS接枝聚合物具有较好的高温稳定性。着重对敏化剂提高接枝率的原因进行了探讨,认为在液固相接枝体系中,溶剂水的辐解产物·OH自由基对接枝率的提高起了非常重要的作用。
Two monomer grafted star SBS polymers, Methacrylicacid (MAA) and Methylmethacrylate (MMA), were prepared by γ-ray irradiation grafting method. Fourier transform infrared spectroscopy (FTIR) (DSC), thermogravimetric analysis (TGA) and nuclear magnetic resonance (13C {1H} nuclear magnetic resonance, NMR) were used to characterize the graft polymer. The results showed that the monomer was successfully SBS chain was introduced, and SBS graft polymer was also found to have good high temperature stability. The reasons for increasing the grafting rate of the sensitizer are discussed. It is considered that the OH radical, a solvent of water, plays an important role in the grafting of the liquid-solid phase grafting system.