Dexian Ji, Meiyun Zhang, Hao Sun, Yuming Lyu, Shelley Lymn Cormier, Cong Ma, Hui Zhang, Yonghao Ni, Shunxi Song
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引用次数: 0
摘要
由芳纶纤维制成的芳纶纸(AP)在电气绝缘应用中表现出卓越的性能。遗憾的是,芳纶纸的强度和电绝缘性能仍未达到最佳状态,这主要是由于芳纶纤维表面光滑且无化学惰性。在此,我们通过由芳纶纳米纤维(ANF)和羰基化玄武岩纳米片(CBSNs)组成的仿珍珠结构对 AP 进行改性。具体做法是将 AP 浸入由三维 ANF 框架作为基质、二维 CBSN 作为填充物的 ANF-CBSNs (A-C)悬浮液中。由此制成的仿生复合纸(AP/A-C 复合纸)呈现出分层的 "砖墙 "结构,具有优异的机械和电气绝缘性能。值得注意的是,AP/A-C5 复合纸的抗张强度和击穿强度分别达到了 39.69 兆帕和 22.04 千伏-毫米-1,与对照 AP 相比分别提高了 155% 和 85%。这些令人印象深刻的特性还包括出色的体积电阻率、优异的介电性能、出色的耐折性、出色的隔热性和出色的阻燃性。这种受珍珠光泽启发的策略为生产用于先进电气设备的极具前景的电气绝缘纸提供了一种有效的方法。
Nacre-inspired composite papers with enhanced mechanical and electrical insulating properties: Assembly of aramid papers with aramid nanofibers and basalt nanosheets
Aramid papers (AP), made of aramid fibers, demonstrate superiority in electrical insulation applications. Unfortunately, the strength and electrical insulating properties of AP remain suboptimal, primarily due to the smooth surface and chemical inertness of aramid fibers. Herein, AP are modified via the nacre-mimetic structure composed of aramid nanofibers (ANF) and carbonylated basalt nanosheets (CBSNs). This is achieved by impregnating AP into an ANF-CBSNs (A-C) suspension containing a 3D ANF framework as the matrix and 2D CBSNs as fillers. The resultant biomimetic composite papers (AP/A-C composite papers) exhibit a layered “brick-and-mortar” structure, demonstrating superior mechanical and electrical insulating properties. Notably, the tensile strength and breakdown strength of AP/A-C5 composite papers reach 39.69 MPa and 22.04 kV·mm−1, respectively, representing a 155% and 85% increase compared to those of the control AP. These impressive properties are accompanied with excellent volume resistivity, exceptional dielectric properties, impressive folding endurance, outstanding heat insulation, and remarkable flame retardance. The nacre-inspired strategy offers an effective approach for producing highly promising electrical insulating papers for advanced electrical equipment.
期刊介绍:
Journal of Materials Science & Technology strives to promote global collaboration in the field of materials science and technology. It primarily publishes original research papers, invited review articles, letters, research notes, and summaries of scientific achievements. The journal covers a wide range of materials science and technology topics, including metallic materials, inorganic nonmetallic materials, and composite materials.