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e-Polymers

Editor-in-Chief: Agarwal, Seema

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1618-7229
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Volume 4, Issue 1

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Volume 1 (2001)

Fractionation and ammonolytic degradation of poly(hexamethylene carbonate) in (supercritical) ammonia

Werner Mormann
  • Corresponding author
  • Universität Siegen, FB 8, Laboratorium für Makromolekulare Chemie, Adolf Reichwein-Str. 2, 57076 Siegen; Fax +49(0)271 7402226
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/ David Spitzer
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  • Entwicklungsgesellschaft für Akustik mbH, Brauckstr. 51, 58454 Witten; Fax +49(0)2302 668 238
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Published Online: 2013-08-31 | DOI: https://doi.org/10.1515/epoly.2004.4.1.81

Abstract

Solubility, fractionation by extraction as a function of temperature, and ammonolysis of α-hydro-ω-hydroxy-poly(oxycarbonyloxyhexane-1,6-diyl) in liquid and supercritical ammonia have been studied. Up to 120°C, the solubility of poly- (hexamethylene carbonate) increases with temperature without significant ammonolytic cleavage. Above the critical temperature of ammonia, solubility and molar mass of the solute decrease as ammonolysis becomes more and more important. The molar mass of the extracted and residual polymer decreases with temperature under supercritical conditions. Adjusting residence time and reactivity through temperature and flow rate enables controlled ammonolysis to constant molar mass. Kinetics of dihexyl carbonate and hexyl carbamate shows that ammonolysis of the carbamate is much faster than of dihexyl carbonate.

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Published Online: 2013-08-31

Published in Print: 2004-12-01


Citation Information: e-Polymers, Volume 4, Issue 1, 009, ISSN (Online) 1618-7229, ISSN (Print) 2197-4586, DOI: https://doi.org/10.1515/epoly.2004.4.1.81.

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