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Russian Chemical Bulletin

, Volume 55, Issue 5, pp 845–851 | Cite as

Thermodynamic properties of linear polyurethanes based on 1,6-hexamethylenediisocyanate with butane-1,4-diol and hexane-1,6-diol in the temperature range from T → 0 to 460 K

  • N. N. Smirnova
  • K. V. Kandeev
  • T. A. Bykova
  • T. G. Kulagina
  • A. M. Fainleib
Article

Abstract

The temperature dependences of the heat capacity of partially crystalline linear polyurethanes based on 1,6-hexamethylenediisocyanate with butane-1,4-diol and hexane-1,6-diol were studied for the first time in a temperature range of 6–460 K by the methods of adiabatic vacuum and dynamic calorimetry. Physical changes in the state of polyurethanes were revealed and characterized; the standard thermodynamic functions, namely, C p °(T), H°(T)-H°(0), S°(T), and G°(T)-H°(0), were calculated from the obtained experimental data in the temperature range from T → 0 to 460 K for the polymers in the crystalline, glassy, highly elastic, and liquid states. The energies of combustion of the polymers were measured by the bomb calorimetry method, and the standard thermodynamic characteristics of their formation at 298.15 K were calculated. The thermodynamic characteristics of bulk polycondensation of 1,6-hexamethylenediisocyanate with butane-1,4-diol and hexane-1,6-diol to form linear aliphatic polyurethanes-{4,6} and-{6,6} were determined in the range from T → 0 to 350 K at p° = 0.1 MPa. The thermodynamic properties of the polyurethanes under study and polymers of isomeric structure were compared.

Key words

polyurethanes based on 1,6-hexamethylenediisocyanate with butane-1,4-diol and hexane-1,6-diol heat capacity enthalpy entropy Gibbs function calorimetry thermodynamics 

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Copyright information

© Springer Science+Business Media, Inc. 2006

Authors and Affiliations

  • N. N. Smirnova
    • 1
  • K. V. Kandeev
    • 1
  • T. A. Bykova
    • 1
  • T. G. Kulagina
    • 1
  • A. M. Fainleib
    • 2
  1. 1.Research Institute of ChemistryN. I. Lobachevsky Nizhnii Novgorod State UniversityNizhnii NovgorodRussian Federation
  2. 2.Institute of Chemistry of High-Molecular-Weight CompoundsNational Academy of Sciences of UkraineKievUkraine

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