Re-Mendable Polyurethanes

Abstract

Novel re-mendable polyurethanes were prepared by the Diels-Alder cycloaddition reaction of urethane bismaleimides to bisfuryl monomers. The urethane bismaleimides were synthesized by an addition reaction of 4-maleimidophenylisocyanate to macrodiols, such as polycaprolactone diol (M_n − 1250 and 2000), PEA-2000 and PBA-2000. The bisfuryl monomers were obtained by the reaction of 2-furfuryl alcohol with hexamethylene diisocyanate or by open-ring reaction of the oxirane ring from diglycidyl bisphenol A with furfuryl amine.

Keywords:

• Cycloaddition reaction
• Polyurethanes
• Thermal properties

Notes

^a Endothermal peak temperature.

^b Onset polymerization temperature.

^c Exothermal peak temperature.

^d Temperature of completion of the polymerization reaction.

^a Glass transition temperature determined from the first maximum of loss modulus by DMA measurements.

^b Initial decomposition temperature.

^c Temperatures for 5 and 10% weight loss.

^d Glass transition temperature from DSC measurement.