Wu Shaohua, Li Chuncheng, Yu Zihua, Ling Rong, Xiao Yaonan, Zheng Liuchun, Liu Jiajian, Zhang Bo
Beijing National Laboratory for Molecular Sciences, Key Laboratory of Engineering Plastics, Institute of Chemistry, Chinese Academy of Sciences (ICCAS), Beijing 100190, P. R. China.
University of the Chinese Academy of Sciences, Beijing 100049, P. R. China.
ACS Appl Mater Interfaces. 2020 Oct 7;12(40):45383-45393. doi: 10.1021/acsami.0c14975. Epub 2020 Sep 23.
Low interfacial adhesion seriously limits the wide application of PBO fiber in composites. To solve this problem, a novel hierarchical reinforcement strategy was developed by introducing epoxy sizing, nanoreinforcement of amino-functionalized silicon dioxide (SiO-NH), and an interfacial compatibilizer of 2,6-bis(2-hydroxy-4-aminophenyl) benzobisoxazole (HABO) onto poly(p-phenylene benzobisoxazole) (PBO) fibers via a facile dip-coating approach. SiO-NH and HABO were uniformly dispersed in epoxy sizing, forming an active interface layer. On this basis, wettability, surface roughness of the PBO fiber, and compatibility with the resin matrix were significantly improved, which gave 88.4 and 40.4% enhancement in the interfacial shear strength and interlaminar shear strength of the corresponding composites, respectively. Moreover, it should be noted that the outstanding mechanical and thermal properties of the PBO fiber were not impaired during the sizing treatment. In summary, our work provides an effective and damage-free approach to improve the interfacial adhesion of PBO/epoxy composites.
低界面粘附力严重限制了PBO纤维在复合材料中的广泛应用。为了解决这一问题，通过一种简便的浸涂方法，将环氧上浆剂、氨基官能化二氧化硅（SiO-NH）纳米增强剂以及2,6-双（2-羟基-4-氨基苯基）苯并双恶唑（HABO）界面增容剂引入聚对苯撑苯并双恶唑（PBO）纤维上，开发了一种新型的分级增强策略。SiO-NH和HABO均匀分散在环氧上浆剂中，形成活性界面层。在此基础上，PBO纤维的润湿性、表面粗糙度以及与树脂基体的相容性得到显著改善，相应复合材料的界面剪切强度和层间剪切强度分别提高了88.4%和40.4%。此外，需要注意的是，PBO纤维优异的力学和热性能在上浆处理过程中并未受到损害。总之，我们的工作提供了一种有效且无损的方法来改善PBO/环氧复合材料的界面粘附力。
