Synthesis and characterization of a series of poly(alkylene carbonate) macrodiols and the effect of their structure on the properties of polyurethanes

Pathiraja A. Gunatillake, Gordon F. Meijs, Simon McCarthy, Raju Adhikari, Nicole Sherriff

Research output: Contribution to journalArticle

41 Scopus citations

Abstract

A series of polycarbonate and copolycarbonate macrodiols was prepared by using an ester interchange reaction with ethylene carbonate and diols such as 1,6-hexanediol, 1,10-decanediol, 2,2-diethyl-1,3-propanediol, 1,4-cyclohexanedimethanol, and 1,3-bis(4-hydroxybutyl)-1,1,3,3-tetramethyldisiloxane. The diols were chosen to prepare a series of macrodiols with different structural features including linear, branched, rigid, and flexible. The macrodiols were characterized by 1H- and 13C-NMR spectroscopy and DSC. The commercial macrodiol based on 1,6-hexanediol exhibited a high level of crystallinity, while with the exception of 1,10-decanediol-based copolycarbonates all the others were completely amorphous. 1,10-Decanediol-based materials showed partial crystallinity under subambient conditions. A series of polyurethane elastomers with a constant hard segment percentage (40 wt %) was prepared using 4,4′-methylenediphenyl diisocyanate and 1,4-butanediol as the hard segment. Tensile test results and Shore hardness measurements demonstrated that polyurethanes based on polycarbonate macrodiols prepared from 1,3-bis(4-hydroxybutyl)-1,1,3,3-tetramethyldisiloxane had the lowest modulus and hardness of the series of polyurethanes. The remaining polyurethanes had high tensile strength with poor elasticity. The morphology of the polyurethanes, as determined by DSC analysis, varied from completely phase-mixed to well phase-separated structures. Polyurethanes based on macrodiols prepared from 1,3-bis(4-hydroxybutyl)-1,1,3,3-tetramethyldisiloxane showed good phase-separated morphology, with sharp hard segment melting endotherms and soft segment glass transitions close to that of the pure soft segment.

Original languageEnglish (US)
Pages (from-to)1621-1633
Number of pages13
JournalJournal of Applied Polymer Science
Volume69
Issue number8
Publication statusPublished - Aug 22 1998
Externally publishedYes

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Keywords

  • Characterization
  • Copolycarbonate macrodiols
  • Phase separation
  • Polyurethane elastomers
  • Siloxane
  • Synthesis
  • Thermal and mechanical properties

ASJC Scopus subject areas

  • Polymers and Plastics

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