title: Multiblock Copolymer-Based Dual Dynamic Disulfide and Supramolecular Crosslinked Self-Healing Networks.
abstract: A new multiblock copolymer self-healing strategy is reported that centers on the synthesis of block copolymers designed with different self-healing motifs incorporated into individual blocks. As a proof of concept, a novel pentablock copolymer (ABCBA) consisting of a poly(ethylene glycol) middle block and self-healable symmetric blocks of a polymethacrylate with pendant disulfide linkages and carboxylic acids is synthesized by a combination of consecutive controlled radical polymerization with hydrolytic cleavage. Disulfide exchange reactions of pendant disulfide linkages and metal-ligand interactions of pendant carboxylic acids with ferric ions allow for the formation of dual crosslinked networks with dynamic disulfide and supramolecular crosslinkages. The resultant networks possessing self-healing viscoelasticity enable self-healing on macroscale damages through supramolecular metal-ligand interactions and disulfide exchange reactions at room or moderate temperatures. These preliminary results suggest that the strategy can offer the versatility in the development of multifunctional self-healable materials in dual or multiple self-healable mechanisms.
authors.affiliation: Department of Chemistry and Biochemistry, Concordia University, Montreal, Quebec, H4B 1R6, Canada.
authors.forename: So Young
authors.initials: SY
authors.lastname: An
authors.affiliation: Research Center for Green Fine Chemicals, Korea Research Institute of Chemical Technology (KRICT), Ulsan, 44412, Republic of Korea.
authors.forename: Seung Man
authors.initials: SM
authors.lastname: Noh
authors.affiliation: Department of Chemistry and Biochemistry, Concordia University, Montreal, Quebec, H4B 1R6, Canada.
authors.forename: Jung Kwon
authors.initials: JK
authors.lastname: Oh
mesh_terms: D002264:Carboxylic Acids / Q000737:chemistry*; D003432:Cross-Linking Reagents / Q000737:chemistry; D004220:Disulfides / Q000737:chemistry*; D057927:Hydrophobic and Hydrophilic Interactions; D008956:Models, Chemical; D015394:Molecular Structure; D011092:Polyethylene Glycols / Q000737:chemistry*; D058105:Polymerization; D011108:Polymers / Q000138:chemical synthesis / Q000737:chemistry*; D011109:Polymethacrylic Acids / Q000737:chemistry*; D066244:Proton Magnetic Resonance Spectroscopy; D013696:Temperature; D014783:Viscosity
chemical_list: D002264:Carboxylic Acids; D003432:Cross-Linking Reagents; D004220:Disulfides; D011108:Polymers; D011109:Polymethacrylic Acids; C030613:polymethacrylic acid; D011092:Polyethylene Glycols
keywords: atom transfer radical polymerization; disulfide chemistry; dual crosslinked networks; multiblock copolymer; self-healing; supramolecular crosslinking