Malleable and Recyclable Poly(urea-urethane) Thermosets bearing Hindered Urea Bonds

Poly(urea-urethane) thermosets containing the 1-tert-butylethylurea (TBEU) structure feature a reversible dissociation/association process of their covalent linkages under mild conditions. Unlike conventional thermosets, TBEU-based poly(urea-urethane) thermosets maintain their malleability after curing. Under high temperature (100 degrees C) and applied pressure (300 kPa), ground TBEU thermoset powder can be remolded to bulk after 20 min.