Abstract
The thicknesses of linear polyethylene crystals formed in dilute solution depend only on the isothermal crystallization temperature and are independent of chain length for molecular weights greater than about 20,000.(1)(2)(3)(4) Thermodynamic properties, such as the density and enthalpy of fusion, are also independent of chain length in this range.(1)(4)(5) These quantities are only dependent on the crystallite thickness which is determined by the crystallization temperature and solvent. In an apparent exception to this generalization, it has been reported that both the density and enthalpy of fusion depend markedly on molecular weight.(6)(7) However, subsequent reports have indicated that these experiments were in error due to sample contamination with celite and grease.(8)
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Go, S., Kloos, F., Mandelkern, L. (1974). The Enthalpy of Fusion of Low Molecular Weight Polyethylene Fractions Crystallized from Dilute Solution. In: Porter, R.S., Johnson, J.F. (eds) Analytical Calorimetry. Springer, Boston, MA. https://doi.org/10.1007/978-1-4757-4509-2_44
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DOI: https://doi.org/10.1007/978-1-4757-4509-2_44
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