Abstract
The deformation behavior and thermodynamics of uniaxial drawing of low-crystalline poly(hydroxyalkanoate) fibers prepared by gel spinning have been studied by differential scanning and deformation calorimetry. The multistage character of thermal effects taking place during stretching have been discovered and analyzed. This phenomenon is likely related to different mechanical relaxation of regions with different levels of order. In softened samples, the amorphous phase first experiences deformation during tensile drawing and relaxation during unloading. With account of direct calorimetric studies during uniaxial tensile drawing, the energy component of this process has been estimated.
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