Abstract
Abstract A recent development of existing thermodynamic theory has been applied to the analysis of heat of fusion (△Hf) data from both “dry” and “suspension” polyethylene) - 1] were constructed for suspension samples assuming various fold models. Irrespective of the model chosen, the perfect crystal heat of fusion was found to be approximately 72 cal/g. From analysis of the slopes of these plots it was concluded that a 10-carbon-atom fold model best fits the suspension △AHf, data. Melting points for suspension crystals were also obtained. Analysis according to the Hoffman-Weeks equation reveals that the equilibrium melting point is somewhat lower than the usual range of accepted values. The discrepancy between the value determined here and that reported by other authors is discussed. The magnitude of the derived surface free energy from melting point data also indicates that PE crystals consist of folds containing approximately 10 methylene units on average. This conclusion is in excellent agreement with ...
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