Preparation of CF/PEEK Composites with High Mechanical Performance Using PEEK Derivatives as the Sizing Agent
Preparation of CF/PEEK Composites with High Mechanical Performance Using PEEK Derivatives as the Sizing Agent
复制标题
以PEEK衍生物为施胶剂制备高力学性能CF/PEEK复合材料
DOI：
10.1002/marc.202200738
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发表时间：
2022-12-18
影响因子：
4.6
通讯作者：
Wang, Shiyu
中科院分区：
文献类型：
--
作者：
Ren, Tianning;Zhu, Guangming;Wang, Shiyu
碳纤维增强聚醚醚酮复合材料（CF/PEEK）由于其优异的物理化学性能，在火箭、导弹、高速飞行器等航天领域得到了广泛的应用。然而，碳纤维（CF）和聚醚醚酮（PEEK）均具有惰性分子链结构，严重影响了CF/PEEK复合材料的界面性能。为了提高CF/PEEK复合材料的性能，采用“两步法”合成了不同羧基化程度的羧基化PEEK（PEEK-COOH）作为施胶剂。然后在活化后的CF表面包覆不同官能化程度的PEEK-COOH施胶层，制备CF/PEEK复合材料。结果表明，施胶剂的加入改善了CF/PEEK复合材料的界面性能。当PEEK-COOH的羧基化度为19.61%时，CF/PEEK复合材料的弯曲强度、弯曲模量和层间剪切强度分别达到489.34 MPa、25.387 GPa和81.3 MPa。此外，PEEK-COOH施胶剂的使用可以在CF和PEEK之间形成优异的过渡层，形成有效的应力传递系统，并促进CF和PEEK之间的均匀应力分布。材料断裂的主要机制由碳纤维脱粘转变为碳纤维与树脂的复合断裂。
Owing to their excellent physical and chemical properties, the carbon fibre reinforced poly(ether-ether-ketone) composites (CF/PEEK) are widely used in aerospace applications such as rockets, missiles, and high-speed vehicles. However, both carbon fibre (CF) and poly(ether-ether-ketone) (PEEK) have inert molecular chain structures, which seriously affect the interfacial properties of CF/PEEK composites. In this study, to improve the properties of CF/PEEK composites, carboxylated PEEK (PEEK-COOH) with different carboxylation degrees is synthesized as the sizing agent by a "two-step" method. Then, the activated CF surface is coated by PEEK-COOH sizing layers with different functionalization degrees to prepare the CF/PEEK composites. The results show that the interfacial properties of CF/PEEK composites are improved after applying the sizing agent. When the carboxylation degree of PEEK-COOH is 19.61%, the flexural strength, flexural modulus, and interlaminar shear strength (ILSS) of CF/PEEK composites reach 489.34 MPa, 25.387 GPa, and 81.3 MPa, respectively. In addition, the use of PEEK-COOH sizing agents can form an excellent transition layer between CF and PEEK, creating an efficient stress transfer system and facilitating an even stress distribution between CF and PEEK. Furthermore, the main mechanism of material fracture changes from CF debonding to CF and resin fracture.