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Morphology and crystalline structure of inclusion compounds formed between poly(ethylene glycol) and urea

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Abstract

The poly(ethylene glycol) (PEG, with M w 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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Authors and Affiliations

  1. Institute of Polymer Science & Engineering, Department of Chemical Engineering, Tsinghua University, Beijing, 100084, China

    Da-wei Lin, Zhi Zhong, Yi-ren Tang, Yang Gao, Ya-ning He, Bao-hua Guo & Jun Xu  (徐军)

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  1. Da-wei Lin
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  2. Zhi Zhong
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  3. Yi-ren Tang
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  4. Yang Gao
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  5. Ya-ning He
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  6. Bao-hua Guo
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  7. Jun Xu  (徐军)
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Corresponding author

Correspondence to Jun Xu  (徐军).

Additional information

This work was financially supported by the National Natural Science Foundation of China (No. 21374054) and the Sino-German Center for Research Promotion.

Invited paper for the special issue of “Polymer Crystallization”

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Lin, Dw., Zhong, Z., Tang, Yr. et al. Morphology and crystalline structure of inclusion compounds formed between poly(ethylene glycol) and urea. Chin J Polym Sci 32, 1234–1242 (2014). https://doi.org/10.1007/s10118-014-1496-8

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  • DOI: https://doi.org/10.1007/s10118-014-1496-8

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