A kinetic study of the isothermal spherulitic crystallization of polyhexamethylene adipamide
1963; Elsevier BV; Volume: 4; Linguagem: Inglês
10.1016/0032-3861(63)90024-7
ISSN1873-2291
Autores Tópico(s)Thermal and Kinetic Analysis
ResumoThe kinetics of the isothermal spherulitic crystallization of polyhexamethylene adipamide have been studied in the temperature range 241° to 252°C. The effects of film thickness, moisture, previous thermal history and molecular weight on the rates of isothermal crystallization have been studied. Equilibrium melting temperatures (Tm) have been determined from the kinetic data and these have been found to be consistent with the theory of Flory concerning the molecular weight dependence of Tm. Comparison between induction times of crystallization and the rate parameters has been made. The results of this work are consistent with spherulitic growth proceeding by a three-dimensional nucleation process and a considerable degree of order in the molten polymer.
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