Molecular association complex of urea with polyethylene: 3. Structural studies of the complex |
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Authors: | Fumiyoshi Yokoyama Kazuo Monobe |
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Affiliation: | Department of Industrial Chemistry, School of Engineering, Okayama University, Tsushima, Okayama 700, Japan |
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Abstract: | The crystal structure of urea-polyethylene complex in the hexagonal form, obtained by one of our preparation methods, is analysed by X-ray power diffractometry. In this analysis, the fixed molecular parameters of urea are used, and three models with respect to rotational disorder of the guest polyethylene molecule are assumed. It is shown that the host lattice structure constructed by urea molecules is essentially the same as that of urea-n-paraffin complex. Effects of the disorder structure of the guest on X-ray scattering of the complex are presented. However, there is a difficulty in identifying the disorder structure by X-ray analysis. With the aid of a potential energy calculation between the hexagonal urea tunnel and the guest molecule, a rotational disorder model is preferred. |
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Keywords: | Urea polyethylene complex adduct inclusion compound crystal structure thermal properties potential energy |
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