Abstract：
Silicate scales are commonly incorporated into cellulose nanofiber (CNF) as functional fillers to enhance electrical insulation and UV-shielding properties. Nevertheless, the addition of substantial quantities of silicate scales in the quest for enhanced functional properties results in reduced interface bonding capability and compromised mechanical properties, thereby restricting their application. Here, inspired from nacre, layered composite paper with excellent mechanical strength, electrical insulation and UV-resistance properties was fabricated through vacuum assisted self-assembly using CNF, PVA and basalt scales (BS). Unlike the conventional blending strategy, the pre-mixed PVA and BS suspension facilitates the formation of Al-O-C bond, thereby enhancing the interfacial bonding between BS and CNF. Consequently, the composite paper (BS@PVA/PVA/CNF) containing 60 wt% BS demonstrates higher mechanical strength-approximately 140 % higher than that of BS/CNF composite paper, achieving a strength of 33.5 MPa. Additionally, it demonstrates enhanced dielectric properties, surpassing those of CNF paper by up to 107 %. Moreover, it exhibits robust ultraviolet-resistant aging performance, retaining ~87 % of its tensile strength after undergoing a simulated two-year aging period. As a result, this work presents a simple and innovative design strategy for enhancing interfacial bonding and optimizing layer structure, providing essential guidelines for large-scale production of high-performance insulation and aging-resistant composite paper.
摘要：
硅酸盐鳞片通常作为功能性填料掺入纤维素纳米纤维(CNF)中以增强电绝缘和UV屏蔽性能。然而，在寻求增强的功能特性中添加大量的硅酸盐鳞片会导致界面结合能力降低和机械性能受损，从而限制其应用。这里,灵感来自珍珠层,具有优异机械强度的层状复合纸，使用CNF通过真空辅助自组装制备电绝缘和抗紫外线性能，PVA和玄武岩鳞片（BS）。与传统的混合策略不同，预混合的PVA和BS悬浮液有利于Al-O-C键的形成，从而增强BS和CNF之间的界面结合。因此,含有60重量%BS的复合纸(BS@PVA/PVA/CNF)表现出更高的机械强度-比BS/CNF复合纸高约140%,实现33.5MPa的强度。此外,它显示出增强的介电性能，超过CNF纸张的107%。此外，它表现出强大的抗紫外线老化性能，在经历了模拟的两年老化期后，保留了约87%的抗拉强度。因此,这项工作提出了一种简单而创新的设计策略，用于增强界面结合和优化层结构，为大规模生产高性能绝缘和耐老化复合纸提供必要的指导方针。
