Abstract
The goal is to quantify the respective influence on relaxation dynamics of the molecular orientation and of the crystallinity in uniaxially drawn polyethylene terephthalate and poly(ethylene glycol-co-cyclohexane-1,4-dimethanol terephthalate) films, the last one presenting a lower ability to crystallize under drawing. Combining Temperature Modulated Differential Scanning Calorimetry and Dynamical Mechanical Analysis investigations we evidenced that cooperativity length scale becomes anisotropic with the molecular orientation induced by drawing.
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