From rigid and flexible foams to elastomers via Michael addition chemistry

- Articles made via Michael addition chemistry are discussed.
- Foams and elastomers are prepared matching capabilities of polyurethanes.
- Properties are dominated by molecular weight between crosslinks.
- Elastomer properties are similar to silicone elastomers.

Carbon-Michael chemistry can be used to produce rigid and viscoelastic foams, as well as flexible elastomers capable of effective function in traditional polyurethane applications. A simple synthetic procedure is provided for converting polyol oligomers and acetoacetate functionalized esters into useful building blocks. In this article detailed procedures for producing foams and elastomers by a carbon-Michael approach, the resulting mechanical properties of these polymeric materials, and structure property relationships for crosslink density are provided. These materials and techniques can potentially be substituted for isocyanate systems, especially in cases where isocyanates may not be advisable due to environmental, health, or safety concerns.

Foams produced using carbon-Michael Chemistry appear and function like polyurethane counterparts. Shown are foams produced using Michael addition formulations described in the article.