Abstract
The mussel-inspired polymerization (MIPoly) of bisquinone (AA type) and dithiol (BB type) monomers utilizes room temperature Michael-type polyaddition to form polymers with adhesive thiol–catechol connectivities (TCCs) in their backbone. The combination of five bisquinones and eight dithiols proves the generic character of this robust polymerization and leads to a TCC-polymer library with 40 different polymers. The set of adhesives is investigated in detail, and structure–property relationships are studied, analyzing material properties and adhesive capabilities. Dry adhesive tests are carried out under hot-melt-like conditions, revealing adhesive strengths up to 2.40 MPa for gluing aluminum and 1.26 MPa for polypropylene. A selected set of TCC adhesives is further studied under seawater-model conditions for the wet-gluing and wet-curing of technical aluminum substrates. The library approach offers access to novel adhesives in the field of mussel-inspired glues as shown by seawater-tolerant adhesives that are providing adhesive strengths of up to 1.25 MPa under hostile high-salt conditions.
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