核磁共振波谱表征弹性体支化结构方法的研究进展  

Progress on characterization of branching structure in elastomers by NMR

作　　者：罗俊杰[1] 卜少华[1] 黄铃[1] Luo Junjie;Bu Shaohua;Huang Ling(Yanshan Branch of Beijing Research Institute of Chemical Industry(BRICI),SINOPEC, Beijing 102500, China)

机构地区：[1]中国石油化工股份有限公司北京化工研究院燕山分院,北京市102500

出　　处：《合成树脂及塑料》2017年第5期92-97,共6页China Synthetic Resin and Plastics

摘　　要：综述了利用核磁共振波谱(NMR)表征弹性体类高聚物的支化度、支链长度、支链序列分布的方法。核磁共振氢谱可通过甲基的化学位移表征短链支化(<6 C)的支化密度,而核磁共振碳谱可以通过支链点附近C原子的化学位移判断支链类型并计算支化密度,不仅适用于短链支化,还可表征较长链支化(≥6 C)的支化结构,及支链在主链上的序列分布。超长链支化的表征是NMR研究支化结构的盲区。针对文献中报道的某些接枝型支化高聚物的NMR结果,总结并提出了利用核磁共振氢谱计算支化密度及支链长度的方法。This paper reviews the characterization of branching degree,length and distribution of branches in elastomers with the help of nuclear magnetic resonance(NMR)spectrum.1H-NMR can be used to characterize the branching density of short chains(<6C)by chemical shift of methyl,while13C-NMR is applied to distinguish the branching structure and calculate the density of branches by carbon chemical shift near the branch-point,which applies to characterization of not only short chains but also structure of long chains(≥6C)as well as sequence distribution of branches in main chains.Characterization of very long-chain branching is difficult via NMR.Calculation for branching density and length of branches via1H-NMR is proposed on the basis of NMR results of graft branched polymers in previous literatures.

关 键 词：核磁共振波谱 弹性体 支化度 支化密度 支链长度 

分 类 号：O657.2[理学—分析化学] TQ334[理学—化学]