Petroleum-derived materials are becoming less attractive for several reasons creating an incentive for alternative renewable sources with comparable or better properties and cost. Bio-based resins synthesized from epoxidized oils typically contain aliphatic, disubstituted oxirane rings which are nearly unreactive with traditional epoxy curative systems, such as amines and polyamides. Given the advantages that these ingredients offer, it would be useful to have a way of using these materials more broadly than what has been possible to date due to limited reactivity of these epoxides with conventional epoxide curatives. The current teachings relate to a two-component system with one side containing epoxide functional constituents and one side containing acidic materials, where one or both components are comprised of one or more bio-based constituents. The resulting polymeric composition is an optionally foaming adhesive that may contain over 90% renewable organic carbon content. Foaming materials are used in applications such as sealing and noise, vibration, and harshness reduction where low density, adhesion to multiple substrates, and accounting for variable gap thickness may be beneficial or required. Potential uses include seals, gaskets, closure strips, isolators, damping materials, and general gap filling.
