Isomorphic Crystallization of Poly(hexamethylene adipate-co-butylene adipate): Regulating Crystal Modification of Polymorphic Polyester from Internal Crystalline Lattice

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The factors influencing the crystalline structure of polymorphic polymer have been investigated for random copolyester, poly(hexamethylene adipate- co -butylene adipate) (P(HA- co -BA)). P(HA- co -BA) exhibits isodimorphic crystallization. The crystalline modification of the PBA homopolymer type crystal was regulated via the isomorphic crystallization behavior of the HA and the BA units in P(HA- co -BA). The PBA β-form was preferred with increasing the HA unit content in the bulk copolymer due to the chain conformation of the HA homopolymer is selectively compatible with the crystalline lattice of the PBA β-form crystal. The temperature for complete or partial formation of the PBA α-form crystal significantly increased with increasing the HA unit content. Particularly, the neat PBA β-form crystal was formed at 35 °C in P(HA- co -BA)(34/66). This study indicates that it is possible to achieve a precise regulation of crystalline modification of polymorphic polyester from the internal crystalline lattice via isomorphic crystallization.