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[n]-Polyurethanes: Synthesis and Characterization.

Versteegen1, Sijbesma, Meijer

  • 1Laboratory of Macromolecular and Organic Chemistry, Eindhoven University of Technology, P.O. Box 513, NL-5600 MB Eindhoven (The Netherlands).

Angewandte Chemie (International Ed. in English)
|December 14, 1999
PubMed
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Researchers developed a general synthesis for aliphatic [n]-polyurethanes, achieving high molecular weights and a unique odd-even melting point effect. This breakthrough advances polyurethane chemistry after decades of research.

Area of Science:

  • Polymer Chemistry
  • Organic Synthesis
  • Materials Science

Background:

  • Otto Bayer first described [m,n]-polyurethanes over 50 years ago.
  • A general synthesis for [n]-polyurethanes has been lacking until now.
  • Polyurethanes are versatile polymers with diverse applications.

Purpose of the Study:

  • To describe the first general synthesis of aliphatic [n]-polyurethanes.
  • To characterize the resulting polymers' molecular weight, microstructure, and thermal properties.
  • To investigate the influence of chain length on polyurethane properties.

Main Methods:

  • Synthesis of alpha,omega-isocyanato alcohol monomers from linear alpha,omega-amino alcohols and di-tert-butyltricarbonate.
  • In situ polymerization of these monomers to form [n]-polyurethanes.

Related Experiment Videos

  • Characterization of polymer molecular weight, microstructure, and melting points.

    • Main Results:

    • Successful general synthesis of a series of aliphatic [n]-polyurethanes.
    • Obtained polymers possess high molecular weight and uniform microstructures.
    • Melting points exhibit a pronounced odd-even effect dependent on the number of repeating units.

    Conclusions:

    • The developed method provides a general route to aliphatic [n]-polyurethanes.
    • The odd-even effect in melting points is a significant finding for structure-property relationships.
    • This work opens new avenues for designing polyurethanes with tailored properties.