Chang Chia-Wei, Wu Chia-Ti, Lo Tse-Yu, Chen Yu, Chang Chun-Ting, Chen Huan-Ru, Chang Chun-Chi, Lee Lin-Ruei, Tseng Yu-Hsuan, Chen Jiun-Tai
Department of Applied Chemistry, National Yang Ming Chiao Tung University, Hsinchu, 300093, Taiwan.
Center for Emergent Functional Matter Science, National Yang Ming Chiao Tung University, Hsinchu, 300093, Taiwan.
Small. 2024 Oct;20(40):e2402472. doi: 10.1002/smll.202402472. Epub 2024 May 30.
Despite significant advancements, current self-healing materials often suffer from a compromise between mechanical robustness and functional performance, particularly in terms of conductivity and responsiveness to environmental stimuli. Addressing this issue, the research introduces a self-healable and conductive copolymer, poly(ionic liquid-co-acrylic acid) (PIL-co-PAA), synthesized through free radical polymerization, and further optimized by incorporating thermoplastic polyurethane (TPU). This combination leverages the unique properties of each component, especially ion-dipole interactions and hydrogen bonds, resulting in a material that exhibits exceptional self-healing abilities and demonstrates enhanced mechanical properties and electrical conductivity. Moreover, the PIL-co-PAA/TPU films showcase alkaline-responsive behavior, a feature that broadens their applicability in dynamic environments. Through systematic characterization, including thermogravimetric analysis, tensile testing, and electrical properties measurements, the mechanisms behind the improved performance and functionality of these films are elucidated. The conductivities and ultimate tensile strength (σ) of the PIL-co-PAA/TPU films regain 80% under 8 h healing process. To extend the applications for wearable devices, the self-healing properties of commercial cotton fabrics coated with the self-healable PIL-co-PAA are also investigated, demonstrating both self-healing and electrical properties. This study advances the understanding of self-healable conductive polymers and opens new avenues for their application in wearable technology.
尽管取得了重大进展，但目前的自愈材料在机械强度和功能性能之间往往存在权衡，特别是在导电性和对环境刺激的响应方面。为了解决这个问题，该研究引入了一种通过自由基聚合合成的可自愈导电共聚物聚（离子液体 - 丙烯酸）（PIL - co - PAA），并通过加入热塑性聚氨酯（TPU）进一步优化。这种组合利用了每种组分的独特性能，特别是离子 - 偶极相互作用和氢键，从而得到一种具有卓越自愈能力、机械性能和导电性增强的材料。此外，PIL - co - PAA/TPU薄膜表现出碱性响应行为，这一特性拓宽了它们在动态环境中的适用性。通过包括热重分析、拉伸测试和电性能测量在内的系统表征，阐释了这些薄膜性能和功能改善背后的机制。在8小时的愈合过程中，PIL - co - PAA/TPU薄膜的电导率和极限拉伸强度（σ）恢复到80%。为了扩展可穿戴设备的应用，还研究了涂覆有可自愈PIL - co - PAA的商用棉织物的自愈性能，其同时展现出自愈和电性能特性。这项研究增进了对可自愈导电聚合物的理解，并为其在可穿戴技术中的应用开辟了新途径。
