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By W. Opechowski

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Hayashi, H. and P. J. Flory, Physica, 120B, 408 (1983). 16. , E. W. Fischer and K. Ibel, J. Polym. : Polym. , 13B, 39 (1975). 17. Fischer, E. W. and M. Dettenmaier, J. Non-Crystalline Solids, 31, 181 (1978). 18. Wignall, G. , in Physical Properties of Polymers, Second Edition, J. E. , American Chemical Society (1993) pp. 313ff. 19. Graessley, W. , J. Polym. : Polym. , 18, 27 (1980). 20. Fetters, L. , D. J. Lohse and R. H. Colby, in Physical Properties of Polymers Handbook, J. E. , American Institute of Physics (1996) p.

However, a deviation at n = 160 is again found. The differences between theory and experiment are small when the higher molecular weight n-alkanes are considered. The significance of these small differences is not clear. There is concern as to the thermodynamically significant melting 42 Fusion of homopolymers Fig. 12 Melting temperature of n-alkanes as a function of chain length. (1) Experimental results: ᭹ Ungar et al. (13); ᭺ Flory and Vrij (11), Lee and Wegner (14); Takamizawa et al. (28). (18,29) Although melting temperatures can be obtained by this technique that are comparable to those from conventional adiabatic calorimetry and dilatometry, special care and procedures need to be adopted.

A detailed investigation of the nature of the fusion and the characteristics of the transformation temperature is required. The concept that the melting of polymers is a first-order transition has important and far reaching consequences. Hence, it is important that the validity of this concept be investigated. If this postulate is not satisfied by experiment and molecular theory, then this premise will have to be discarded. 2 Nature of the fusion process We examine the problem posed above by analyzing the melting of different polymers.

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