Abstract
In this work, the solidification process and the crystal growth kinetics of polyethylene glycol 4000 (PEG4000) and polyethylene glycol 6000 (PEG6000) (molecular average weight 4000 and 6000, respectively) were characterized by thermal optical microscopy (OM) and differential scanning calorimetry (DSC). The growth rate decreased with increasing crystallization temperature. The kinetic rate constant was lower for PEG6000 than for PEG4000 (29,300 and 32,900 K2, respectively). This behavior is related to the different number of folds (folding index n) of the crystal structures. From comparison of microscopy and calorimetry measurements, the kinetic rate constant values were higher by microscopy due to different melt histories, self-nucleation, and degree of entanglement.
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