Lee, Min Wook An, Seongpil Kim, Yong-Il Yoon, Sam S. Yarin, Alexander L. 2024-01-19T23:31:06Z 2024-01-19T23:31:06Z 2021-09-03 2018-02-15 1385-8947 https://pubs.kist.re.kr/handle/201004/121698 In this study, electrospun core-shell nanofibers containing healing agents are embedded into a three-dimensional bulk matrix in a simple versatile process. Two types of the healing agents (resin monomer and cure) are encapsulated inside the nanofiber cores. The core-shell fibers are encased in the macroscopic three-dimensional bulky material. To achieve this goal, the electrospun core-shell fibers containing two components of PDMS (either resin monomer or cure) are directly embedded into an uncured PDMS bath and dispersed there, essentially forming a monolithic composite. For the evaluation of the self-healing features, the interfacial cohesion energy is measured at the cut surface of such a material. Namely, the bulk of the prepared self-healing material is entirely cut into two parts using a razor blade and then re-adhered due to the self-curing process associated with the released healing agents. The results reveal that the self-healing fiber network works and releases a sufficient amount of resin monomer and cure at the cut surface to facilitate self-healing. In addition, chopped into short filaments core-shell fibers were embedded into highly porous sponge-like media. After a mechanical damage in compression or shearing fatigue, this sponge-like material also revealed restoration of stiffness due to the released self-healing agents. The sponges revealed a 100% recovery and even enhancement after being damage in the cyclic compression and shearing tests, even though only 0.086% of the healing agents were embedded per sponge mass and finely dispersed in it. English ELSEVIER SCIENCE SA MICROVASCULAR NETWORKS MECHANICAL-PROPERTIES POLYMER COMPOSITE COATINGS DAMAGE Self-healing three-dimensional bulk materials based on core-shell nanofibers Article 10.1016/j.cej.2017.10.034 1 CHEMICAL ENGINEERING JOURNAL, v.334, pp.1093 - 1100 CHEMICAL ENGINEERING JOURNAL 334 1093 1100 scie scopus 000418533400108 2-s2.0-85033454592 Engineering, Environmental Engineering, Chemical Engineering Article MICROVASCULAR NETWORKS MECHANICAL-PROPERTIES POLYMER COMPOSITE COATINGS DAMAGE Self-healing Core-shell fibers Three-dimensional Composite Sponge