Adhesives
AssigneePurdue Research Foundation
InventorsJonathan James Wilker, Michael Gabriel Mazzotta, Michael North, Amelia Putnam
Life of this patent
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Abstract
The invention relates to biomimetic adhesive compositions emulating mussel adhesive proteins, wherein multiple chains of a copolymer are interlinked via specific hydrogen bonds and/or ligand-metal-ligand bonds, which serve as sacrificial breakable bonds upon mechanical stress and thereby effectively dissipate the mechanical energy. Accordingly, toughened adhesive compositions with improved ductility and strength may be obtained.
Claims17
An adhesive composition comprising multiple chains of a copolymer including a first co-monomer selected from one of dopamine methacrylamide, 3,4-dihydroxyphenylalanine or 3,4-dihydroxystyrene, and a second co-monomer comprising a pendant first functional group;
- wherein at least two of the first functional groups of different copolymer chains are interlinked non-covalently via:
- a neutral hydrogen bond formed between the first functional groups of the interlinked first and second copolymer chains, wherein in the neutral hydrogen bond the following relationship is met:
- ΔpKa=pKa (DH)−pKa (AH+)>0, wherein pKa (DH) is the pKa value of a hydrogen bond donor and pKa (AH+) is the pKa value of a hydrogen bond acceptor;
- a first additive comprising second and third functional groups, each of which form neutral hydrogen bonds with said first functional groups of different copolymer chains;
- or
- a second additive, which is a metal ion, to which said first functional groups of different copolymer chains are bound through a ligand-metal-ligand bond, the first functional groups forming the ligands.
An adhesive composition comprising multiple chains of a copolymer including a first co-monomer selected from one of dopamine methacrylamide, 3,4-dihydroxyphenylalanine or 3,4-dihydroxystyrene and present in a proportion of about 20 mol % to about 40 mol %, and a second co-monomer comprising a pendant first functional group and present in a proportion of about 60 mol % to about 80 mol %;
- wherein at least two of the first functional groups of different copolymer chains are interlinked non-covalently via:
- a neutral hydrogen bond formed between the first functional groups of the interlinked first and second copolymer chain, wherein in the neutral hydrogen bond(s) the following relationship is met:
- ΔpKa=pKa (DH)−pKa (AH+)>0, wherein pKa (DH) is the pKa value of a hydrogen bond donor and pKa (AH+) is the pKa value of a hydrogen bond acceptor;
- a first additive comprising second and third functional groups, each of which form neutral hydrogen bonds with said first functional groups of different copolymer chains;
- or
- a second additive, which is a metal ion, to which said first functional groups of different copolymer chains are bound through a ligand-metal-ligand bond, the first functional groups forming the ligands.
Dependencies are inferred from the claim text.