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Melting behaviour of low molecular weight poly (ethylene-oxide) fractions

I. Extended chain crystals
  • C. P. Buckley
  • A. J. Kovacs
Conference paper
Part of the Progress in Colloid & Polymer Science book series (PROGCOLLOID, volume 58)

Abstract

Two available theories of melting in extended chain polymer crystals are critically examined and compared with calorimetric data. Melting points, T m , and enthalpy of fusion, ΔH, have been measured for extended-chain crystals of poly(ethylene-oxide) fractions, covering a wide range of molecular weights. It appears that the theory of Flory and Vrij is the most appropriate to describe the present results and literature data. Application of this theory to experiments yields T m (∞) = (68.9 ± 0.4) °C and suggests that the value of the surface free energy, σ e , lies within 0.34 and 0.81 Kcal/mole, its enthalpic part (ΔH e /2) being (4.18 ± 0.22) Kcal/mole. Such a low value of σ e may be attributed to hydrogen bonding of OH end-groups located in the disordered surface layer of closely stacked crystalline lamellae.

Keywords

Surface Free Energy Melting Behaviour Extended Chain Polymer Crystal Lamellar Crystal 
These keywords were added by machine and not by the authors. This process is experimental and the keywords may be updated as the learning algorithm improves.

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Copyright information

© Dr. Dietrich Steinkopff Verlag GmbH & Co. KG 1975

Authors and Affiliations

  • C. P. Buckley
    • 1
    • 2
  • A. J. Kovacs
    • 1
  1. 1.C.N.R.S. Centre de Recherches sur les MacromoléculesStrasbourgFrance
  2. 2.Department of Textile TechnologyUMISTManchesterU K

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