Morphology and Crystalline Structure of Inclusion Compounds Formed between Poly(ethylene glycol) and Urea

Da-wei Lin; Zhi Zhong; Yi-ren Tang; Yang Gao; Ya-ning He; Bao-hua Guo; Jun Xu

doi:10.1007/s10118-014-1496-8

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Morphology and Crystalline Structure of Inclusion Compounds Formed between Poly(ethylene glycol) and Urea

Updated：2021-06-21

- Morphology and Crystalline Structure of Inclusion Compounds Formed between Poly(ethylene glycol) and Urea
- Chinese Journal of Polymer Science Vol. 32, Issue 9, Pages: 1234-1242(2014)
- Affiliations：
  
  Institute of Polymer Science & Engineering, Department of Chemical Engineering, Tsinghua University, Beijing 100084, China
- Author bio：
  
  **Jun Xu (徐军), E-mail: jun-xu@tsinghua.edu.cn
- Funds：
- DOI：10.1007/s10118-014-1496-8
  CLC：
- Received：08 April 2014，
  
  Revised：2014-04-28，
  
  Accepted：04 May 2014，
  
  Published：2014-09
- Accepted：
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Da-wei Lin, Zhi Zhong, Yi-ren Tang, et al. Morphology and Crystalline Structure of Inclusion Compounds Formed between Poly(ethylene glycol) and Urea[J]. Chinese Journal of Polymer Science, 2014, 32(9): 1234-1242.
DOI：

Da-wei Lin, Zhi Zhong, Yi-ren Tang, et al. Morphology and Crystalline Structure of Inclusion Compounds Formed between Poly(ethylene glycol) and Urea[J]. Chinese Journal of Polymer Science, 2014, 32(9): 1234-1242. DOI： 10.1007/s10118-014-1496-8.

摘要

Abstract

The poly(ethylene glycol) (PEG

with

2000)-urea inclusion compound (IC) crystallized at high temperature region showed two typical orientations

flat-on and edge-on crystals. 2D-XRD and polarized FTIR spectroscopy revealed that the PEG chains within urea channels were perpendicular to the substrate in flat-on oriented crystals

while PEG chain axes were parallel to the substrate and lay along the growth direction in the edge-on crystals. FTIR absorption bands of PEG in the ICs are sensitive to orientation of the crystals. A scheme of PEG chain packing in the urea IC channel was proposed

which could explain the orientation of the crystal nucleus causing the two types of morphologies. Furthermore

functioning of PEG2000 chain end with analine had significantly influence on the morphology and orientation of the inclusion compound crystals

due to the defects caused by large terminal groups included in the urea channel.

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