【摘要】 <正> 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。然而作者仍然发现有两个小峰4′和8′（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更多还原

【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 withthe peaks 4,6 and 8 of the isolate 1,2-unit in PBD and to be a result of the splitting ofthe latter three peaks, respectively. In order to explanation these results authors of thispaper consider that there must exist a new, with a higher energy level, configuration,which would show a certain shielding effect on the C_α and C_γ but decrease the shieldingeffect on the C_β of the isolate 1,2-unit of PBD chain.更多还原