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本文用傅里叶交换红外光谱、X线衍射、XPS和GPC等手段表征了氧化镁与苯乙烯的辐射接枝共聚物。结果表明,在接枝共聚物的红外谱图和X线衍射图上出现有氧化镁和聚苯乙烯的谱带。氧化镁与聚苯乙烯共混物XPS谱图中的C_(1S)、O_(1S)以及Mg_(2S)能级的峰位分别为285.0、530.0和87.6 eV,而氧化镁与苯乙烯接枝聚合物的C_(1S)、O_(1S)和Mg_(2S)峰位分别为284.0、531.7和88.4 eV。说明氧化镁与苯乙烯辐射接枝聚合时,氧化镁被辐射后镁原子引起照射缺陷而成为接枝活性中心,与苯乙烯碰撞时镁原子与电负性大的碳原子相配位产生自由基。然后按自由基机理进行接枝聚合反应。接枝物中的O/C比随接枝率的增加而下降。接枝共聚物的分子量要比均聚物分子量大,但分子量分布较宽。
In this paper, Fourier transform infrared spectroscopy, X-ray diffraction, XPS and GPC and other means of magnesium oxide and styrene radiation graft copolymer. The results show that there are bands of magnesium oxide and polystyrene in the infrared spectrum and X-ray diffraction pattern of the graft copolymer. The peaks of C_ (1S), O_ (1S) and Mg_ (2S) in the XPS spectra of magnesium oxide and polystyrene blends were 285.0, 530.0 and 87.6 eV, respectively, while the MgO and styrene grafts The polymer C_ (1S), O_ (1S) and Mg_ (2S) peak positions were 284.0,531.7 and 88.4 eV, respectively. Magnesium oxide and styrene radiation grafting polymerization, MgO irradiation by irradiation of magnesium atoms caused defects in irradiation and become the center of grafting activity, and styrene collision with the electronegativity of carbon atoms to produce free radicals. Then by free radical mechanism for graft polymerization. The O / C ratio of the grafts decreases with the grafting rate. The molecular weight of the graft copolymer than the homopolymer molecular weight, but the molecular weight distribution is wider.