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用高分辨核磁共振氢谱(H~1-NMR)研究聚甲基丙烯酸甲酯与苯乙烯共聚物(MMA-St共聚物)序列结构的文献很多.主要根据MMA-St共聚物中甲基丙烯酸甲酯的甲氧基共振峰,在H~1-NMR谱中呈现三重峰,这与MMA单元的近邻苯乙烯以及MMA与St的立体构型有关,借助于共聚理论可以间接求出包括立体构型影响在内的序列分布.用红外光谱(I.R)研究MMA-St共聚物的报道不多,柳(氵尺)一生用红外光谱研究了游离基聚合的St共聚物,其中包括MMA-St共聚物,观察到St单元的1068、543厘米~(-1)吸收峰随St序列长度缩短向高波数位移,此外MMA单元的1148、1191厘米~(-1)吸收峰,亦随MMA序列长度的改变有位移.我们的实验证实了柳(氵尺)一生的结果,同时还得到:
There are many literatures about the sequence structure of polymethylmethacrylate and styrene copolymer (MMA-St copolymer) by H-NMR, which is mainly based on the content of methacrylic acid Methoxy resonance of methyl ester showed a triplet peak in the H-1-NMR spectrum, which was related to the near-neighbor styrene and the stereoconfiguration of MMA and St in the MMA unit. By means of the copolymerization theory, Type effects on the distribution of MMA-St copolymers by infrared spectroscopy (IR) reported little, Liu (氵 feet) lifetime FT-IR study of the free radical polymerization of St copolymers, including MMA-St copolymerization It was observed that the absorption peak at 1068,543 cm -1 of St unit shifted to the higher wave number as the length of St sequence shortened. In addition, the absorption peak at 1148 and 1191 cm -1 of MMA unit also changed with the length of MMA sequence Change the displacement.Our experiments confirmed the results of Liu (氵 尺) life, but also get: