Collect. Czech. Chem. Commun. 2000, 65, 1820-1832

Miscibility and Crosslinking of Polybutadiene-Based Polyurethanes

Miloslav Pekař* and Pavel Kopecký

Institute of Physical and Applied Chemistry, Faculty of Chemistry, Brno University of Technology, Purkyňova 118, 612 00 Brno, Czech Republic


Rheokinetics of polybutadiene-based polyurethanes was studied. Sixteen mixtures differing in the miscibility of reactive components and hard segments contents were prepared. Regardless of the miscibility of the components, the rheokinetics behaviour is qualitatively very similar. The viscous response part is formed and finished much earlier than the elastic part. The quantitative dissimilarities, caused by cooperative effect of miscibility and differences in reactivity, are described. Using a well miscible initial mixture need not give the best results as a reactive crosslinker can easily react with isocyanate and separate from the rest of the reaction mixture thus impairing the final phase structure.

Keywords: Crosslinking; Miscibility; Polybutadiene; Polyurethanes; Rheokinetics; Polymers; Macromolecules.

References: 14 live references.