In extreme environments, it is difficult to balance the strength and toughness of ultra-thin film materials. To address this problem, we propose a promising strategy to build ultra strong, tough and extreme environments resistant Poly(p-phenylene-2,6-benzobisoxazole) (PBO) papers with a nacre-like structure constructed by synergistic electrostatic interaction and interlayer entanglement through the sol–gel-film method and hot press orientation. Highly interconnected PBO nanofibres （PNFs） with positive charges are tightly wound around the anisotropic graphene oxide (GO) nanosheets with negative charges through strong electrostatic interaction, forming a nacre like microstructure. The addition of Fe (Ⅲ) can form a coordination bond with the amino group on PNFs. Chemical crosslinking and hydrogen bonding synergize with interlayer entanglement effect among different PNFs，which can effectively dissipate interlayer energy and alleviate the conflict between strength and toughness. The resultant tensile strength and toughness are as high as 338.3 MPa and 16.04 MJ/m，which are 197.7 % and 425.4 % of those of the intrinsic PBO paper, respectively. Additionally, after 5000 folding-unfolding cycles, the tensile strength retention and toughness retention of the PBO/GO/Fe (PGFe) paper were still 85.4 % and 71.9 %, respectively. Moreover, the paper exhibits excellent tolerance to extreme temperature environments and showed extremely strong chemical stability.

中文翻译：

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超强、坚韧和耐极端环境的 PBO 纸，具有由协同静电相互作用和层间缠结构成的珍珠质结构


在极端环境下，超薄膜材料的强度和韧性很难达到平衡。为了解决这个问题，我们提出了一种有前途的策略来构建超强、坚韧和耐极端环境的聚（对亚苯基-2,6-苯并二恶唑）（PBO）纸，其具有由协同静电相互作用和层间缠结构建的珍珠质结构通过溶胶-凝胶-薄膜法和热压​​取向。高度互连的带正电荷的PBO纳米纤维（PNFs）通过强静电相互作用紧密缠绕在带负电荷的各向异性氧化石墨烯（GO）纳米片上，形成珍珠质状的微结构。添加Fe(Ⅲ)可以与PNFs上的氨基形成配位键。化学交联和氢键作用与不同PNF之间的层间缠结效应协同作用，可以有效耗散层间能量，缓解强韧性之间的矛盾。所得拉伸强度和韧性高达338.3 MPa和16.04 MJ/m，分别是本征PBO纸拉伸强度和韧性的197.7%和425.4%。此外，经过 5000 次折叠-展开循环后，PBO/GO/Fe (PGFe) 纸的拉伸强度保留率和韧性保留率仍分别为 85.4% 和 71.9%。此外，该纸张对极端温度环境表现出优异的耐受性，并表现出极强的化学稳定性。