Homogeneous reinforcement as a strategy for the efficient preparation of high-strength, insulating and high heat-resistant PBO composite paper
Homogeneous reinforcement as a strategy for the efficient preparation of high-strength, insulating and high heat-resistant PBO composite paper
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均质增强是高效制备高强绝缘高耐热PBO复合纸的策略
DOI：
10.1007/s10853-022-07176-x
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发表时间：
2022-05
影响因子：
4.5
通讯作者：
Bo Zhang
中科院分区：
文献类型：
--
作者：
Yufu Gao;Shaohua Wu;Chuncheng Li;Yaonan Xiao;Jiajian Liu;Bo Zhang
聚苯并二苯并异恶唑（PBO）纤维基特种纸由于其优异的性能而成为高性能绝缘材料的一种很有前途的候选材料。但PBO纸的多孔结构和界面相互作用差严重削弱了其机械强度，极大地限制了其实际应用。本文首次提出了一种均匀增强策略，以调节PBO纸的微观结构，有效提高PBO纸的综合性能。为此，首次合成了柔性邻羟基聚酰胺酸（HPAA），并将其用于PBO纸的浸渍。随后，HPAA被热转化为含苯并恶唑的树脂，与PBO纸表现出良好的界面相容性。因此，紧凑的结构和坚实的界面赋予了复合纸令人印象深刻的性能。复合纸的抗拉强度、模量和电击穿强度分别为116.86 MPa、5.47 GPa和63.7 kV mm−1，比原纸的参数（3.43 MPa、0.60 GPa和30.5 kV mm−1）分别提高了33.1倍、8.1倍和1.1倍。此外，由于结构的精心设计，复合纸还具有超低的介电常数和损耗正切（106 Hz时分别为1.6和0.004），以及超高的热稳定性（最高分解温度，Tmax≈600℃）。因此，PBO复合纸的机械强度与优异的绝缘和热性能成功结合，使轻质PBO复合纸在高温高压电气绝缘领域具有广阔的应用前景。图形抽象
Poly(p-phenylene benzobisoxazole) (PBO) fibre-based specialty paper has become a promising candidate for high-performance insulating materials due to the remarkable properties of PBO fibres. However, the porous structure and poor interfacial interaction of PBO paper seriously weaken its mechanical strength and greatly limit its practical application. Herein, proposed for the first time, a homogeneous reinforcement strategy is developed to regulate the microstructure of PBO paper and efficiently enhance its overall properties. For this reason, flexible ortho-hydroxy polyamic acid (HPAA) was first synthesized and used to impregnate PBO paper. Subsequently, HPAA was thermally converted into a benzoxazole-containing resin, manifesting excellent interfacial compatibility with PBO paper. As a result, the compact structure and solid interface endow the composite paper with impressive performance. The tensile strength, modulus, and electrical breakdown strength of the composite paper are 116.86 MPa, 5.47 GPa, and 63.7 kV mm−1, respectively, increasing by 33.1, 8.1, and 1.1 times compared with those parameters of the original paper (3.43 MPa, 0.60 GPa, and 30.5 kV mm−1). Moreover, the composite paper also exhibits an ultra-low dielectric constant and loss tangent (1.6 and 0.004 at 106 Hz, respectively), as well as superhigh thermal stability (maximum decomposition temperature, Tmax ≈ 600 °C) due to the elaborate design of the structure. Thus, the mechanical strength has been successfully integrated with the outstanding insulation and thermal properties, rendering the lightweight PBO composite paper promising in the field of high-temperature and high-voltage electrical insulation.Graphical abstract
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