摘要
测定了两个氢化丁苯共聚物样品的~1H、^(13)C NMR谱。通过处理文献中的^(13)C NMR谱数据得到了-C_2H_5和-C_6H_5的SCS参数。利用乙烯-α-烯烃共聚物的SCS方法结合DEPTNMR实验技术重新归属了该共聚物的^(13)C NMR谱。明确指出,氢化丁苯共聚物分子链中主链任何一个乙烯单元的两个CH_2在序列分布上分属于二元组和三元组。CH则用三元组来表征。最后,对HBS共聚物的序列分布进行了计算。
Two hydrogenated butadiene-styrene copolymer (HBS) samples are studied by 1H NMR and 13C NMR by using JEOL-FX100 NMR and Varian UNITY -400 superconductive spectrometer. The SCS parameters of ethyl (-C2H5) and benzyl ( -C6H5) are obtained by dealing with the 13C NMR data from references. The 13C NMR spectrum of HBS is reassigned by using the SCS method of ethylene -α-olefin copolymers and the DEPT NMR experiment . It is pointed out that the two methylenes of any ethylene unit in the main chain of HBS belong to dyad and triad respectively. The methine in the main chain is expressed by triad.Finally the sequence distribution of dyad and triad is calculated. The molar composition of styrene, butene and ethylene unit in HBS calculated from 13C NMR spectrum is consistant with that calculated from 1H NMR spectrum.
出处
《波谱学杂志》
CAS
CSCD
1993年第1期47-54,共8页
Chinese Journal of Magnetic Resonance
基金
高分子物理开放实验室资助项目
关键词
取代基效应
序列
氢化丁苯
共聚物
Ethylene-a-olefin copolymers
Substituent chemical shift (SCS)
Sequence structure
Hydrogenated butadiene-styrene copolymer (HBS) .
