Crystallization kinetics by differential scanning calorimetry for PCL/starch and their reinforced sisal fiber composites

Calorimetric results obtained by differential scanning calorimetry (DSC) ha ve been used to develop a kinetic model for the crystallization behavior of PCL/starch and their composites with sisal fibers. The model takes into ac count the effects of nucleation and crystal growth, and it is able to descr ibe the isothermal and nonisothermal conditions, especially for the low coo ling rates. The effect of the sisal fiber has also been analyzed. The Avram i exponent was 2.0 for the crystallization of PCL/starch and sisal fiber re inforced composite. The activation energy of the crystallization process wa s 4.3 and 4.0 kJ/moI for PCL/starch and sisal composite, respectively. The induction time of the crystallization and the crystallization rate was not influenced by the presence of sisal fiber.