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By J. F. Jackson, L. Mandelkern (auth.), Roger S. Porter, Julian F. Johnson (eds.)

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Additional resources for Analytical Calorimetry: Proceedings of the American Chemical Society Symposium on Analytical Calorimetry, San Francisco, California, April 2–5, 1968

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THE EQUILIBRIUM MELTING TEMPERATURE AND SURFACE FREE ENERGY 33 RESULTS AND DISCUSSION The morphologies of the single crystal aggregates ranged from dendritic stacks of crystals to large mono layered platelets each having a characteristic thickness dependent on the crystallization temperature, Tc' The dimensions of each group of single crystals are tabulated in Table 1. In the results which follow, we would like to emphasize that it is the crystal thickness between fold surfaces which determines the melting temperature, Tm, of each sample.

OoC and surface free energy of 89±5 erg/cm- 2 were estimated. 3) At a constant heating rate the fraction of thickening crystals was found to decrease monotonically with increasing fold period. 4) The apparent heat of fusion increases as polyethylene single crystals are prepared in dilute solution at progressively smaller undercoolings. It is estimated that a 100% crystalline sample could be obtained from dilute solution when the crystallization temperature is equal to the dissolution temperature.

For this reason it was decided to compare rates of crystallinity development on a reduced crystallinity basis. The reduced crystallinity was calculated as the amount of crystallinity developed at any time divided by the total crystallinity attained at that tel"lperature. Plots of reduced crystallinity vs. log time, such as Fig. 2, show that the maximum slope of these curves is independent of crystallization temperature. Exact superposition of the curves by a shifting along the log time axis is not possible, however, because the S-shaped nature of the crystallization curve is much more pronounced at Im~er te"'1perat;ures, primarily because of the shorter times involved.

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