Tacticity, sequence distribution, anomalous linkages, and alkyl chain branching in ethylene-vinyl alcohol copolymers as studied by proton and carbon-13 NMR
Tacticity, sequence distribution, anomalous linkages, and alkyl chain branching in ethylene-vinyl alcohol copolymers as studied by proton and carbon-13 NMR
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通过质子和碳 13 NMR 研究乙烯-乙烯醇共聚物的立构规整性、序列分布、异常键和烷基链支化
DOI：
10.1021/ma00185a025
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发表时间：
1988
期刊：
影响因子：
5.5
通讯作者：
G. V. D. Velden
中科院分区：
文献类型：
--
作者：
H. Ketels;J. Beulen;G. V. D. Velden
对乙烯-乙烯基醇(E-VOH)共聚物的200-300-MHz 1H核磁共振谱进行了仔细的重新检查，对所有观察到的亚胺和羟基共振进行了完整的指认(三元水平)。从~1H和~(13)C核磁共振谱中获得了组成序列数据和构型序列放置(规律性)。讨论了~1H和~(13)C核磁共振法在确定异常结构和非水解链支化方面的局限性。
A careful reexamination of the 200-300-MHz 1H NMR spectra of ethylenevinyl alcohol (E-VOH) copolymers has led to a complete assignment (on a triad level) of all observed methine and hydroxyl resonances. Compositional sequence data and configurational sequence placements (tacticity) have been obtained from 1H and 13C NMR spectra. The limitations of 1H and 13C NMR methods for the determination of anomalous structures and nonhydrolyzable chain branching are discussed.