| Morphology and Crystalline Structure of Inclusion Compounds Formed between Poly（ethylene glycol） and Urea |
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| 引用本文： | 徐军.Morphology and Crystalline Structure of Inclusion Compounds Formed between Poly（ethylene glycol） and Urea[J].高分子科学,2014,32(9):1234-1242. |
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| 作者姓名： | 徐军 |
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| 作者单位： | Institute of Polymer Science & Engineering, Department of Chemical Engineering, Tsinghua University, Beijing 100084, China |
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| 基金项目： | This work was financially supported by the National Natural Science Foundation of China （No. 21374054） and the Sino- German Center for Research Promotion. |
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| 摘 要： | The poly（ethylene glycol） （PEG, with Mw 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 fiat-on oriented crystals, while PEG chain axes were parallel to the substrate and lay along the growth direction in the edge-on crystals. FT1R 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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| 关 键 词： | 晶体结构 聚乙二醇 包合物 尿素 形态 晶体取向 FTIR光谱 集成电路 |
Morphology and crystalline structure of inclusion compounds formed between poly(ethylene glycol) and urea |
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| Da-wei Lin,Zhi Zhong,Yi-ren Tang,Yang Gao,Ya-ning He,Bao-hua Guo,Jun Xu.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. |
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| Authors: | Da-wei Lin Zhi Zhong Yi-ren Tang Yang Gao Ya-ning He Bao-hua Guo Jun Xu |
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| Institution: | 1. Institute of Polymer Science & Engineering, Department of Chemical Engineering, Tsinghua University, Beijing, 100084, China
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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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| Keywords: | Poly（ethylene glycol） Urea Inclusion compounds Morphology Orientation |
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