정성민 Jang, Han Gyeol Jo, Jun Young 김윤상 Lee, Doh C. Kim, Jaewoo 2024-01-12T06:36:10Z 2024-01-12T06:36:10Z 2023-06-18 2023-05 1944-8244 https://pubs.kist.re.kr/handle/201004/79930 Polymer materials are extensively used because of their excellent performance; however, when used for a long time, they break and eventually lose their original properties. Thus, smart polymer materials that can repeatedly detect and repair damage must be urgently developed to increase their durability and lifespan. In this study, a smart material with dual functionality (damage-detection and self-healing) is developed via a facile method of incorporating spiropyran (SP) beads, which exhibit changes in color and fluorescence when damaged, into a Diels？Alder (DA)-based self-healing matrix. When polyurethane (PU) is added to the DA-based matrix, the dual functionality exhibits a strong dependence on the proportion of PU. Because the PU ratio affects two opposing factors (damaged area and load-bearing capacity), the damage-detecting ability exhibits the best performance at 40 wt % PU, where both factors are optimized. A high healing efficiency of 96% is achieved via a dynamic DA reaction. In particular, the repeatability of the dual-functionality is successfully attained through the reversibility of the SP beads and DA networks, where the detection and healing efficiencies are reduced by 15 and 23%, respectively, after 10 cycles. Furthermore, the reprocessed fractured specimens exhibit excellent recyclability. English American Chemical Society Smart Materials with Dual Functionality: Repeatable Damage-Detection and Self-Healing Article 10.1021/acsami.3c04194 1 ACS Applied Materials & Interfaces, v.15, no.21, pp.26028 - 26036 ACS Applied Materials & Interfaces 15 21 26028 26036 N scie scopus 001014092700001 Nanoscience & Nanotechnology Materials Science, Multidisciplinary Science & Technology - Other Topics Materials Science Article COVALENT BONDS POLYMERS MECHANOCHEMISTRY MECHANOPHORES ACTIVATION spiropyran Diels-Alder damage-detection self-healing repeatability recycling