Chinese Journal of Magnetic Resonance ›› 1993, Vol. 10 ›› Issue (1): 47-54.
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Tian Wenjing, Zhou Zinan, Feng Zhiliu, Wu Shengrong, Jing Fengying, Zhang Jianguo, Pei Fengkui
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Abstract: 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.
Key words: Ethylene-a-olefin copolymers, Substituent chemical shift (SCS), Sequence structure, Hydrogenated butadiene-styrene copolymer (HBS)
Tian Wenjing, Zhou Zinan, Feng Zhiliu, Wu Shengrong, Jing Fengying, Zhang Jianguo, Pei Fengkui. SUBSTITUENT CHEMICAL SHIFT (SCS)AND THE SEQUENCE STRUCTURE OF ETHYLENE-α-OLEFINE COPOLYMERS——7. Hydrogenated Butadiene-Styrene Copolymer[J]. Chinese Journal of Magnetic Resonance, 1993, 10(1): 47-54.
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http://magres.apm.ac.cn/EN/Y1993/V10/I1/47
