Non-isocyanate polyurethane foams based on six-membered cyclic carbonates

Abstract

Polyurethane foams currently dominate the global foam market. Nevertheless, the main drawback of these foams remains the use of toxic isocyanate reagents. To overcome this issue, several ways have been explored. The most promising route appears to be the aminolysis of 5-membered cyclic carbonates leading to formation of polyhydroxyurethanes (PHUs). However, the lack of reactivity of systems using C5-cyclic carbonates currently limits the application range of PHUs. Hence, this study reports the first synthesis of PHUs foams using a new tetrafunctional 6-membered cyclic carbonate (TC6). The TC6 was reacted with different diamines under catalyst-free and mild temperature conditions in presence of a chemical blowing agent. Three different amines were employed, allowing access to various foams properties. Finally, promising flexible foams have been obtained, with interesting properties that could make them possible new candidates for applications as seating or insulation mattresses.