Dynamically crosslinked tough adhesive with recyclability
A crosslinked adhesive composition comprising: (i) a polymer; (ii) solid particles embedded within the polymer; and (iii) a multiplicity of boronate linkages crosslinking between the polymer and solid particles, wherein the boronate linkages have the formula wherein the polymer and particles are connected to each other through the boronate linkages, and the crosslinked adhesive composition has an ability to bond surfaces and a further ability to thermally debond and rebond the surfaces. Also described herein is a method of bonding first and second surfaces together, the method comprising placing the above-described crosslinked adhesive composition onto the first surface and pressing the second surface onto the crosslinked adhesive composition on the first surface.
1 . A crosslinked adhesive composition comprising:
(i) a polymer matrix;
(ii) solid particles dispersed throughout the polymer matrix and having a metal oxide composition; and
(iii) a multiplicity of boronate linkages crosslinking between the polymer matrix and solid particles, wherein the boronate linkages have the formula
wherein the polymer matrix and particles are connected to each other through the boronate linkages, and the crosslinked adhesive composition has an ability to bond surfaces.
2 . The composition of claim 1 , wherein the composition has a further ability to thermally debond and rebond the surfaces.
3 . The composition of claim 1 , wherein the polymer matrix is a thermoplastic polymer.
4 . The composition of claim 1 , wherein the polymer matrix is an elastomeric polymer.
5 . The composition of claim 1 , wherein the polymer matrix is attached to the boron atom of the boronate linkage and the solid particles are attached to the oxygen atoms of the boronate linkage.
6 . The composition of claim 1 , wherein the polymer matrix contains aromatic groups attached to the boronate linkage.
7 . The composition of claim 6 , wherein the polymer matrix is polystyrene or a copolymer thereof.
8 . The composition of claim 1 , wherein the solid particles have a size of 1-100 nm.
9 . The composition of claim 1 , wherein the solid particles have a size of 1-100 microns.
10 . The composition of claim 1 , wherein the metal oxide composition is selected from the group consisting of silica, alumina, yttria, zirconia, and titania.
11 . The composition of claim 1 , wherein the solid particles have an organic composition.
12 . The composition of claim 11 , wherein the organic composition is selected from natural and synthetic polymers.
13 . The crosslinked adhesive composition of claim 1 , wherein the crosslinked adhesive composition excludes solvents.