【摘要】 <正> 用高分辨核磁共振氢谱（H¹-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H¹-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:更多还原

【Abstract】 A series of M-S low conversion copolymers were prepared by free radical polymerization and their IR spectra were measured.The 1149.5 cm-1 band which is related to a skeletal vibration coupled with CH deformation vibration in PMMA, is shifted to lower wave number with a decrease in the content of MMA in the copolymer.Two results can be drawn:(1) The correlation curve between this band position and the sequence length of M unit in the copolymer is obtained.(2) The displacement of wave number of this band is approximately proportional to FSMS which is defined as the mole fraction of SMS in trids of SMS. MMS. SMM. and MMM.Other environmental-sensitive bands which depend on sequence distribution were also discussed.更多还原