Abstract
High molecular weight poly[(butylene succinate)-ran-(e-caprolactone)] copolyesters (PBS-ran-PCL) were synthesized in a wide composition range and compared with significantly lower molecular weight samples synthesized previously. DSC and WAXS showed that these copolyesters are isodimorphic (i.e., each crystalline phase contains a small amount of the second comonomer) as they able to crystallize in the entire composition range and display a pseudoeutectic point, and their unit cell dimensions are a function of composition. Copolymers close or away from the pseudoeutectic point exhibited a single crystalline phase, i.e., PBS-rich or PCL-rich crystalline phase. At the pseudoeutectic point, both phases can crystallize in double crystalline banded spherulites, as demonstrated by polarized light optical microscopy (PLOM) studies. An increase in molecular weight of the copolyester does not influence Tm and Tc significantly, as their values are determined by the randomness of the comonomer distribution. However, c...
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