This study focuses on synthesizing a range of hydrolysis-modified poly(phthalazione ether nitrile) polymers with different quantities of carboxyl groups (HPPEN-COOH). These polymers are intended to enhance the bonding strength between carbon fibers (CFs) and poly(phthalazine ether sulfone ketone) (PPESK). The chemical structure of HPPEN-COOH was elucidated using FTIR spectroscopy, and the presence of HPPEN-COOH as a coating on the CFs surface was confirmed by XPS analysis. Compared with the UCF/PPESK composite, the interlaminar shear strength of the CF-5/PPESK composite increased by 39%. In the DMA test, the service temperature and storage modulus of the CF-5/PPESK composite were increased to 268°C and 112 GPa, respectively. Furthermore, the composite showed satisfactory performance in hydrothermal aging studies. This method is simple and easy to implement, has the potential for large-scale industrial production, and is an environmentally friendly method to improve the interface properties of the CF/PPESK composite.

中文翻译：

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水性羧化聚苯并氮酮醚腈施胶剂的制备用于CF/PPESK复合材料界面增强

本研究重点合成一系列具有不同羧基数量（HPPEN-COOH）的水解改性聚（二氮杂萘醚腈）聚合物。这些聚合物旨在增强碳纤维（CF）和聚（二氮杂萘醚砜酮）（PPESK）之间的粘合强度。使用 FTIR 光谱阐明了 HPPEN-COOH 的化学结构，并通过 XPS 分析证实了 HPPEN-COOH 作为 CF 表面涂层的存在。与UCF/PPESK复合材料相比，CF-5/PPESK复合材料的层间剪切强度提高了39%。在DMA测试中，CF-5/PPESK复合材料的使用温度和储能模量分别提高到268℃和112 GPa。此外，该复合材料在水热老化研究中表现出令人满意的性能。该方法简单易行，具有大规模工业化生产的潜力，是一种环境友好的改善CF/PPESK复合材料界面性能的方法。