Crystallization of Poly(butylene terephthalate) and Its Blends with Polyarylate

J. Runt, D. M. Miley, X. Zhang, K. P. Gallagher, K. McFeaters, J. Fishburn

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In this paper we explore the crystallization kinetics of poly(butylene terephthalate) (PBT), polyethylene terephthalate) (PET), and miscible blends of PBT with a polyarylate based on Bisphenol A and a 75/25 mole ratio of isophthalic and terephthalic acids. For PBT, a regime II → III transition is indicated near 210 °C (ΔT ∼ 30 °C) and the fold surface free energy (σe) was found to be in the range of 57-75 erg/cm2. This leads to a work of chain folding (q) of ∼3-5 kcal/mol folds. Analysis of the crystallization data of van Antwerpen and van Krevelen for PET shows that crystallization occurs in regime II across a wide range of Tc· σe, was estimated to be ∼140 erg/cm2 and q∼10 kcal/mol from their data. These values are roughly twice that of PBT, consistent with the longer flexible segments in the PBT repeat unit. Crystallization data for three PBT/PAr blends was analyzed using a modified Lauritzen-Hoffman method and compared to that of pure PBT.

Original languageEnglish (US)
Pages (from-to)1929-1934
Number of pages6
Issue number7
StatePublished - Mar 1 1992

All Science Journal Classification (ASJC) codes

  • Organic Chemistry
  • Polymers and Plastics
  • Inorganic Chemistry
  • Materials Chemistry


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