Bio-Based Polyurethane Containing Isosorbide for Use in Composites and Coatings

Report No. ARL-TR-7259
Authors: Faye R Toulan; Joshua M Sadler; John J La Scala
Date/Pages: April 2015; 18 pages
Abstract: The purpose of this research is to formulate polyurethane 1) for use in composites or coatings that contain isosorbide as part or all of the polyol phase and 2) that can be easily molded or cast into a film at ambient conditions. Solubility studies were conducted to determine the maximum amount of isosorbide that could remain in solution with other diols. Formulation of polyurethanes using isosorbide as part or all of the polyol phase combined with monomers such as toluene diisocyanate (TDI) and isophorone diisocyanate (IPDI) in the isocyanate phase. TDI reactivity at ambient conditions was too extreme, while IPDI was not reactive enough. Prepolymerized polyisocyanates were studied with isosorbide and compared with a commercial polyurethane coating. The dynamic mechanical analysis showed that isosorbide as a drop-in replacement for the commercial polyol increased the Tg 17 °C. However, ultraviolet exposure revealed that the polyurethane containing isosorbide does not perform as well as the commercial product with defects such as brittleness and delamination.
Distribution: Approved for public release
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Last Update / Reviewed: April 1, 2015