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Polymer Bulletin

, Volume 58, Issue 1, pp 201–211 | Cite as

Effect of diluent on the gel point and mechanical properties of polyurethane networks

  • Andrea Ďuračková
  • Helena Valentová
  • Miroslava Dušková-Smrčková
  • Karel Dušek
Article

Summary

Gel point conversions and equilibrium tensile moduli of polyester-based polyurethane networks were determined for different dilutions during network formation. Also, the limiting dilution beyond which the network was not formed at full conversion of functional groups was determined. It ranged between 92 and 94% of diluent. The scaling dependences against the reference states – the ring-free case and the limiting dilution case – showed that the excluded volume effects were operative and structural changes associated with cyclization affected the rates of both the intramolecular and the intermolecular reactions.

Keywords

Triol Volume Phase Transition Dibutyltin Dilaurate Exclude Volume Effect Intermolecular Reaction 
These keywords were added by machine and not by the authors. This process is experimental and the keywords may be updated as the learning algorithm improves.

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Copyright information

© Springer-Verlag 2006

Authors and Affiliations

  • Andrea Ďuračková
    • 1
    • 2
  • Helena Valentová
    • 3
  • Miroslava Dušková-Smrčková
    • 1
    • 3
  • Karel Dušek
    • 1
  1. 1.Institute of Macromolecular ChemistryAcademy of Sciences of the Czech RepublicPrague 6Czech Republic
  2. 2.Tomas Bata UniversityZlínCzech Republic
  3. 3.Department of Macromolecular Physics, Faculty of Mathematics and PhysicsCharles UniversityPrague 8Czech Republic

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