氢化丁苯共聚物结构的核磁共振波谱表征Ⅱ.微观结构的定量计算

在氢化丁苯共聚物¹³C-NMR谱脂肪碳部分谱带归属的基础上,根据各谱带的主要来源,推导出六个二单元浓度的计算公式。计算出二单元、一单元的相对含量,各结构单元的数均序列长度、嵌段含量和其它结构参数。加氢前后的¹H-和¹³C-NMR谱的组成计算结果基本一致。初步探讨了作为粘度指数改进剂的氢化丁苯共聚物微观结构与性能的关系,为合成提供了依据。

NMR SPECTRUM CHARACTERIZATION OF HYDROGENATED STYRENE-BUTADIENE COPOLYMERS Ⅱ-The Quantitative Calculation of Structure Units

According to the contribution of main structural units to the peaks, six equations for diad concentrations in terms of peak intensity have been derived based on the ¹³C-NMR spectrum assignments of hydrogenated styrene-butadiene copolymers (HPBS). Many structural data, including the concentrations of diads, monomer units and their blocks, the number-average sequence lengths of each monomer unit and other structural parameters, were calculated. Basically consistent results from ¹H-and ¹³C-NMR spectra were obtained for the styrene-butadiene copolymers before and after hydrogenation. Furthermore, the correlation between the microstructure of HPBS and its behavior serving as viscosity index improver has been preliminarily investigated. The results would provide a basis for preparation of HPBS with better performance.