Fabrication of Microcapsules by the Combination of Biomass Porous Carbon and Polydopamine for Dual Self-Healing Hydrogels.

Artificial development of smart materials from agricultural waste or food residues are particularly desirable for green chemistry. In this paper, dual network self-healing hydrogels were successfully fabricated by using functional microcapsule. This microcapsule was established by biomass porous carbon after recycling of apple residues. And glutaraldehyde (GA) as the healing agent was embedded in the porous carbon and the outer was coated with polydopamine (PDA). After adding the microcapsules, modifying guar gum-type hydrogels were successfully obtained with dual self-healing performance by combination of healing agent and metal-ligand coordination. The self-healing efficiency was about 89.9% from tension test and fracture strength displayed as 7.68 MPa. These results not only highlight a new idea for the utilization of apple residues, but also provide a new method for the preparation of excellent self-healing hydrogels.