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Pressure effects on the phase transition of urea adducts withn-paraffins and polyethylene |
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| Authors: | A Koiwai H Miyaji T Asahi K Asai Y Miyamoto |
| Institution: | (1) Department of Physics, Faculty of Science, Kyoto University, 606 Kyoto, Japan;(2) College of Liberal Arts, Kyoto University, 606 Kyoto, Japan;(3) Present address: Toyota Central Research Laboratory, Nagakute, 480-11 Aichi, Japan |
| Abstract: | The decomposition of urea adducts with hydrocarbons is treated as a first-order phase transition and the pressure dependence is studied up to 0.7 GPa for several kinds of adducts. The thermodynamic quantities at the decomposition of the adduct can be analysed as a sum of those quantities of the component materials. The transition from the orthorhombic to the hexagonal form of the adduct with polyethylene is also investigated by X-ray diffraction and the pressure dependence of the lattice parameters is measured for the adducts. The results are compared with the phase transition in the pure paraffin. |
| Keywords: | Clathrate urea-paraffin adducts phase transition thermodynamic analysis X-ray diffraction high pressure |
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