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利用~(13)C NMR 研究聚丁二烯的微观结构,国内外都有报道,荒木和 F·conti,等探讨以 n-Buli 催化剂制备的聚丁二烯的微观结构。本文利用~(13)C NMR 探讨自由基聚合的五种分子量的聚丁二烯和离子型聚合的聚丁二烯之间微观结构的差异,分析了链结构中的三种序列,确定计算化学位移的经验参数,计算脂碳区各谱峰的化学位移和理论强度,利用脂碳区面积积分值和烯碳区峰高值进行顺—1,4,反—1,4和1,2单元的相对含量计算。实验方法
The microstructure of polybutadiene has been reported by ~ (13) C NMR, both at home and abroad, Araki and F · conti, etc. The microstructure of polybutadiene prepared by n-Buli catalyst was investigated. In this paper, the differences of the microstructures of free-radical polymerized polybutadienes and ionic polybutadienes were investigated by ~ (13) C NMR. Three sequences in the chain structure were analyzed, Displacement of the empirical parameters to calculate the chemical shifts and theoretical intensity of the peaks in the aliphatic carbon region, cis-1,4, trans-1,4, and 1,2 units were calculated using the integral values of the carbon-carbon area and the peak height of the olefin-carbon region The relative content of the calculation. experimental method