title: Dual Sulfide-Disulfide Crosslinked Networks with Rapid and Room Temperature Self-Healability.
abstract: Polymer-based crosslinked networks with intrinsic self-repairing ability have emerged due to their built-in ability to repair physical damages. Here, novel dual sulfide-disulfide crosslinked networks (s-ssPxNs) are reported exhibiting rapid and room temperature self-healability within seconds to minutes, with no extra healing agents and no change under any environmental conditions. The method to synthesize these self-healable networks utilizes a combination of well-known crosslinking chemistry: photoinduced thiol-ene click-type radical addition, generating lightly sulfide-crosslinked polysulfide-based networks with excess thiols, and their oxidation, creating dynamic disulfide crosslinkages to yield the dual s-ssPxNs. The resulting s-ssPxN networks show rapid self-healing within 30 s to 30 min at room temperature, as well as self-healing elasticity with reversible viscoelastic properties. These results, combined with tunable self-healing kinetics, demonstrate the versatility of the method as a new means to synthesize smart multifunctional polymeric materials.
authors.affiliation: Department of Chemistry and Biochemistry, Centre for NanoScience Research, Concordia University, Montreal, Quebec, Canada, H4B 1R6.
authors.forename: So Young
authors.initials: SY
authors.lastname: An
authors.affiliation: Research Center for Green Fine Chemicals, Korea Research Institute of Chemical Technology, Ulsan, 681-310, Republic of Korea.
authors.forename: Seung Man
authors.initials: SM
authors.lastname: Noh
authors.affiliation: Research Center for Green Fine Chemicals, Korea Research Institute of Chemical Technology, Ulsan, 681-310, Republic of Korea.
authors.forename: Joon Hyun
authors.initials: JH
authors.lastname: Nam
authors.affiliation: Department of Chemistry and Biochemistry, Centre for NanoScience Research, Concordia University, Montreal, Quebec, Canada, H4B 1R6.
authors.forename: Jung Kwon
authors.initials: JK
authors.lastname: Oh
mesh_terms: D057930:Click Chemistry; D004220:Disulfides / Q000737:chemistry*; D004548:Elasticity; D005609:Free Radicals / Q000737:chemistry*; D007700:Kinetics; D010084:Oxidation-Reduction; D058105:Polymerization; D011108:Polymers / Q000138:chemical synthesis*; D013438:Sulfhydryl Compounds / Q000737:chemistry*; D013440:Sulfides / Q000737:chemistry*; D013696:Temperature; D014783:Viscosity
chemical_list: D004220:Disulfides; D005609:Free Radicals; D011108:Polymers; D013438:Sulfhydryl Compounds; D013440:Sulfides
keywords: crosslinked networks; polymer synthesis; self-healing; thiol-disulfide chemistry; thiol-ene addition