Intermediate state and weak intermolecular interactions of 伪-trans-1,4-Polyisoprene during the gradual cooling crystallization process investigated by In situ FTIR and two-dimensional infrared correlation spectroscopy

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• 作者：Xiaoan Wang (11045)
  Kewei Xiang (11045)
  Yijing Nie (11045)
  Guangsu Huang (11045)
  Jinrong Wu (11045)
  Zhiqing Su (11045)
  
• 关键词：crystallization ; FTIR ; intermediate state ; two ; dimension correlation analysis
• 刊名：Macromolecular Research
• 出版年：2013
• 出版时间：May 2013
• 年：2013
• 卷：21
• 期：5
• 页码：493-501
• 全文大小：1168KB
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• 作者单位：Xiaoan Wang (11045)
  Kewei Xiang (11045)
  Yijing Nie (11045)
  Guangsu Huang (11045)
  Jinrong Wu (11045)
  Zhiqing Su (11045)
  
  11045. State Key Laboratory of Polymer Materials Engineering, College of Polymer Science and Engineering, Sichuan University, Chengdu, 610065, P. R. China
  
• ISSN：2092-7673

文摘

The investigation of the gradual cooling crystallization process of 伪-trans-1,4-polyisoprene (伪-TPI) was carried out for different wavenumber regions by conventional spectral analysis and two-dimensional correlation infrared spectroscopy (2DIR) methods. Interestingly, an intermediate state has been confirmed by the fascinating intensity variation of the 1666 cm鈭? band, and the motion of side-chain (CH3 group) seems to be the initial driving force and precondition for forming the ordered 21 helix conformation. It is also found that the occurrence for the splitting of the CH3 group-related bands is consistent with the appearance of the intermediate state, indicating that the interchain interactions between CH3 groups play an important role in controlling the intermediate state and should be the primary driving force for stabilizing the specific 21 helix conformation.