An overview on 12-polyurethane: Synthesis, structure and crystallization

C. E. Fernández, M. Bermúdez, R. M. Versteegen, E. W. Meijer, G. J. Vancso, S. Muñoz-Guerra

Research output: Contribution to journalArticleAcademicpeer-review

19 Citations (Scopus)

Abstract

The knowledge on linear aliphatic polyurethanes n-PUR has increased significantly due to a series of works made in these last years and published in recent literature. An overview of 12-polyurethane (12-PUR) embracing its synthesis, thermal properties, crystal structure and crystallization is given in this paper. The purpose is to provide a representative example able to reflect comprehensively the state of the art reached for the whole family. The synthesis of 12-PUR was accomplished in good yield and with acceptable molecular weight from 12-amino-1-dodecanol by applying a two-step method without isolation of the isocyanate alcohol precursor. 12-PUR is a semicrystalline polymer with an equilibrium melting temperature of 157 °C. It adopts a layered crystal structure similar to the α-form of nylons with chains in fully-extended conformation and arranged in hydrogen-bonded sheets in the antiparallel mode. This structure is thermally stable up to melting and is unable to undergo Brill transition. 12-PUR crystallized from dilute solution affording well-shaped lamellar crystals with a thickness of 8-9 nm and from the melt yielding either banded or fibrillar spherulitic textures displaying negative birefringence. Isothermal crystallization of 12-PUR from the melt took place with heterogeneous nucleation, while both crystallization rate and the finally attained crystallinity degree were highly depending on crystallization temperature.

Original languageEnglish
Pages (from-to)2089-2098
Number of pages10
JournalEuropean Polymer Journal
Volume46
Issue number11
DOIs
Publication statusPublished - 1 Nov 2010

Keywords

  • Polymer crystal morphology
  • Polymer crystal structure
  • Polyurethanes
  • Structure-properties relationship

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