引用本文:
周子南, 王松波, 吴盛容, 王彦. 聚丁二烯链中孤立1,2-单元的两种构型[J]. 应用化学,
1987, 4(1): 73-74.
Citation: Zhou Zinan, Wang Songbo, Wu Shengrong, Wang Yan. Two Configurations of the Isolate 1,2-unit in PBD Chain[J]. Chinese Journal of Applied Chemistry, 1987, 4(1): 73-74.
Citation: Zhou Zinan, Wang Songbo, Wu Shengrong, Wang Yan. Two Configurations of the Isolate 1,2-unit in PBD Chain[J]. Chinese Journal of Applied Chemistry, 1987, 4(1): 73-74.
聚丁二烯链中孤立1,2-单元的两种构型
摘要:
用13C-NMR波谱方法研究聚丁二烯的键接序列结构,在归属13C-NMR谱(脂碳谱)中各共振吸收峰时,使用经验方法无疑是十分有效的[1-5]。然而作者仍然发现有两个小峰4'和8'[4](图1),它们的归属不能从经验方法得到令人满意的解释。最近一张新的聚丁二烯的13C-NMR谱图表明,在6峰的低场方向还有另一谱峰、6'峰存在(图2)。6'峰的出现同样不能通过运用经验方法处理聚丁二烯的键接序列结构得到理解。
English
Two Configurations of the Isolate 1,2-unit in PBD Chain
Abstract:
Three small peaks 4', 6' and 8' in the aliphatic part of 13C-NMR spectrum of poly-butadiene (PBD) have been observed. Their appearance is considered to be related with the peaks 4,6 and 8 of the isolate 1,2-unit in PBD and to be a result of the splitting of the latter three peaks, respectively. In order to explanation these results authors of this paper consider that there must exist a new, with a higher energy level, configuration, which would show a certain shielding effect on the Cα and Cγ but decrease the shielding effect on the Cβ of the isolate 1,2-unit of PBD chain.
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