Abstract
Random copolymers ranging from 0 to 27 % in β-hydroxyvalerate content were studied. While X-ray data indicated that the crystallinity remained at about 60 % throughout this composition range, DSC and density data indicated a substantial reduction. The inverse gas chromatography data confirmed the X-ray results, as did studies by FTIR spectroscopy. It is concluded that for polymers exhibiting isodimorphism (unit cocrystallization), the assumptions involved in calculating the crystallinity of the copolymers from the density or heat of fusion of pure corresponding homopolymers are incorrect.
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