On the growth rate maximum in extended-chain growth of crystals of linear paraffins

  • Miller R
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Isothermal crystallization of a pure n-paraffin at temperatures near its melting point results in extended chain crystals whose growth rate-crystallization temperature curve exhibits a maximum and whose melting point appears to be lower than that expected. This behaviour can be explained in terms of polymer crystal nucleation theory with a model in which registration of chain ends is not perfect resulting in a transient layer of cilia on the crystal and to an end surface free energy σ' for that ciliated surface. The presence of the maximum, however, requires a decreasing nucleation rate with decreasing temperature-contrary to customary expectations. This can be shown to be a consequence of the crystallization of (essentially) fixed length stems: the combination of the relevant nucleation and backward reaction terms thus giving rise to the maximum. The temperature at which the maximum occurs is a function of the degree of imperfection at the end surface. © 1992.

Author-supplied keywords

  • end surface free energy
  • extended chains
  • n-paraffin crystallization
  • nucleation theory

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  • Robert L. Miller

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