ポリエーテルエステルエラストマーの構造と変形機構

概要

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The structure and mechanical properties of three kinds of polyether-ester elastomers were studied. The crystallization speed of the elastomer based on poly(butylene terephthalate) (PBT) as hard segment was higher than that of the elastomer based on poly(ethylene terephthalate) (PET) from the molten state. The elastomer based on higher molecular weight (Mn) of soft segment had higher crystallization speed than the elastomer based on lower molecular weight of soft segment. All of them had spherulitic structures in the molded articles. The spherulitic structure could be elastically elongated and retracted. The strain of the spherulitic structures is lower than that of affine deformation. The shape of the spherulitic structures was not broken under the extension ratio of 6 but the internal structure was changed with high strain. In a rubber-like state their modulus rose up in the order of PET-Mn2000, PBT-Mn2000 and PBT-Mn1000. However, at temperatures higher than 165°C their modulus fell in the order of PET-Mn2000, PBT-Mn2000 and PBT Mn1000 due to the effect of the melting point of hard segment. In the transition state PET-Mn2000 and PBT-Mn2000 revealed higher modulus than PBT-Mn1000 which did not contain crystallized soft segments. Their Mooney-Rivlin plots suggested effects of strain hardening at the higher extension ratio above the value of 7.