Self-healing adhesive composition
A self-healing adhesive composition comprising a homogeneous mixture of: (i) a self-healing polymer containing hydrogen bonding groups or long-chain alkyl groups, wherein said hydrogen bonding groups comprise hydrogen bond donating groups and hydrogen bond accepting groups, and wherein said long-chain alkyl groups contain at least four carbon atoms; and (ii) an extrudable adhesive polymer base having a curable property and no self-healable property; wherein component (i) is present in the self-healing adhesive composition in an amount of at least 10 wt % and up to 70 wt % of the total of components (i) and (ii). Also described herein is a method of sealing a space (e.g., crack, gap, or pores) in a substrate material by at least partially filling the space with the self-healing adhesive composition described above and permitting the self-healing adhesive composition to harden over time without applying an external stimulus to induce hardening.
1. A self-healing adhesive composition comprising a homogeneous mixture of:
(i) a self-healing polymer having the following structure:
wherein:
n is an integer of at least 10;
m is an integer of at least 1;
X is O or NH;
L is a linkage selected from the group consisting of —NHC(O)—, —NHC(O)O—, and —NHC(O)NH—;
R 1 is hydrogen atom or methyl; and
R 2 is a hydrocarbon group containing at least four carbon atoms, wherein the hydrocarbon group containing at least four carbon atoms is selected from the group consisting of n-butyl, sec-butyl, isobutyl, n-pentyl, isopentyl, n-hexyl, isohexyl, 2-ethylhexyl, n-heptyl, n-octyl, n-nonyl, n-decyl, n-undecyl, n-dodecyl, cyclopentyl, methylcyclopentyl, cyclohexyl, and methylcyclohexyl groups;
and
(ii) an extrudable adhesive polymer base having a curable property and no self-healable property, wherein said extrudable adhesive polymer base has a silicone-containing, acrylate-containing, epoxy-containing, vinyl ether-containing, or polyurethane-containing composition;
wherein component (i) is present in the self-healing adhesive composition in an amount of at least 10 wt % and up to 70 wt % of the total of components (i) and (ii).
2. The composition of claim 1 , wherein m is an integer of 2-4.
3. The composition of claim 1 , wherein component (i) is present in the self-healing adhesive composition in an amount of at least 10 wt % and up to 60 wt % of the total of components (i) and (ii).
4. The composition of claim 1 , wherein said extrudable adhesive polymer base is a sealant polymer base.
5. A method of sealing a space in a material, the method comprising at least partially filling said space with the self-healing adhesive composition of claim 1 and permitting the self-healing adhesive composition to harden over time.
6. The method of claim 5 , wherein the hardened self-healing adhesive composition exhibits an adhesion force of at least 500 N·m −1 on said material.
7. The method of claim 5 , wherein said extrudable adhesive polymer base is a sealant polymer base.
8. The composition of claim 1 , wherein said extrudable adhesive polymer base has a silicone-containing, epoxy-containing, vinyl ether-containing, or polyurethane-containing composition.