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Melt Crystallization of Poly(butylene 2,6-naphthalate)

  • Qian Ding
  • Michelina Soccio
  • Nadia Lotti
  • Dario CavalloEmail author
  • René AndroschEmail author
Review
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Abstract

Poly(butylene 2,6-naphthalate) (PBN) is a crystallizable linear polyester containing a rigid naphthalene unit and flexible methylene spacer in the chemical repeat unit. Polymeric materials made of PBN exhibit excellent anti-abrasion and low friction properties, superior chemical resistance, and outstanding gas barrier characteristics. Many of the properties rely on the presence of crystals and the formation of a semicrystalline morphology. To develop specific crystal structures and morphologies during cooling the melt, precise information about the melt-crystallization process is required. This review article summarizes the current knowledge about the temperature-controlled crystal polymorphism of PBN. At rather low supercooling of the melt, with decreasing crystallization temperature, β’- and α-crystals grow directly from the melt and organize in largely different spherulitic superstructures. Formation of α-crystals at high supercooling may also proceed via intermediate formation of a transient monotropic liquid crystalline structure, then yielding a non-spherulitic semicrystalline morphology. Crystallization of PBN is rather fast since its suppression requires cooling the melt at a rate higher than 6000 K·s−1. For this reason, investigation of the two-step crystallization process at low temperatures requires application of sophisticated experimental tools. These include temperature-resolved X-ray scattering techniques using fast detectors and synchrotron-based X-rays and fast scanning chip calorimetry. Fast scanning chip calorimetry allows freezing the transient liquid-crystalline structure before its conversion into α-crystals, by fast cooling to below its glass transition temperature. Subsequent analysis using polarized-light optical microscopy reveals its texture and X-ray scattering confirms the smectic arrangement of the mesogens. The combination of a large variety of experimental techniques allows obtaining a complete picture about crystallization of PBN in the entire range of melt-supercoolings down to the glass transition, including quantitative data about the crystallization kinetics, semicrystalline morphologies at the micrometer length scale, as well as nanoscale X-ray structure information.

Keywords

Poly(butylene 2,6-naphthalate) Crystallization Polymorphism Semicrystalline morphology 
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Notes

Acknowledgments

Q. D. acknowledges financial support from the China Scholarship Council (CSC), for performing research at the Martin Luther University Halle-Wittenberg (Germany). R. A. and Q. D. acknowledge financial support from Sino-German Center for Research Promotion (GZ 1514).

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© Chinese Chemical Society Institute of Chemistry, Chinese Academy of Sciences Springer-Verlag GmbH Germany, part of Springer Nature 2019

Authors and Affiliations

  1. 1.School of Packaging Design and ArtHunan University of TechnologyZhuzhouChina
  2. 2.Department of Civil, Chemical, Environmental and Materials EngineeringUniversity of BolognaBolognaItaly
  3. 3.Department of Chemistry and Industrial ChemistryUniversity of GenovaGenovaItaly
  4. 4.Interdisciplinary Center for Transfer-oriented Research in Natural Sciences (IWE TFN)Martin Luther University Halle-WittenbergHalle/SaaleGermany

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