Equilibrium and non-equilibrium melting of branched polyethylene relating to defect incorporation within crystals |
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Authors: | J. Martinez-Salazar M. Sánchez Cuesta F. J. Baltá Calleja |
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Affiliation: | (1) Present address: Instituto de Estructura de la Materia, CSIC, Madrid, Spain |
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Abstract: | New equilibrium melting point data, for polyethylene containing chain defects, are tested in the light of random copolymer predictions. A simplified expression for the melting point depression of random copolymers containing small amounts of non-crystallizable units is derived. Non-equilibrium melting data for rapidly quenched polyethylene samples are also reported. The fusion enthalpyH(X), and the surface free energye for crystals containing defects are evaluated using crystallinity, equilibrium meltingtemperatures and X-ray long period data. It is shown that increasing defect penetration within crystals induces a decrease ofH(X) withX in accordance with theoretical predictions. Finallye is, similarly, shown to decrease with increasing number of chain defects attached to the crystal surface. |
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Keywords: | Branchedpolyethylene equilibriummelting point enthalpy offusion surface free energy kinks chain defects |
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