Synergy of Interfacial Reinforcing and Damage Monitoring at Elevated Temperature by Constructing Fluorescence Interphase of Perylenediimide Nanowires in Carbon Fiber/Bismaleimide Composites

作     者：Sun, Yuhang Su, Qingfu Li, Gang Yang, Xiaoping Zuo, Xiaobiao 

作者机构：State Key Laboratory of Organic-Inorganic Composites Beijing University of Chemical Technology Beijing100029 China Changzhou Institute of Advanced Materials Beijing University of Chemical Technology Changzhou213164 China National Engineering Research Center of Functional Carbon Composite Aerospace Research Institute of Materials & Processing Technology Beijing100076 China 

出 版 物：《SSRN》 

年 卷 期：2024年

核心收录：

主　　题：Carbon fibers 

摘      要：Amino-terminated perylenediimide (PDI) was designed and used to construct molecular assembly interphase with high temperature resistance and fluorescence on modified carbon fiber (CF-PDI) surface, and the correlations of the novel interphase with interfacial reinforcement and damage monitoring of carbon fiber/bismaleimide (CF/BMI) composites at 25 ℃, 100 ℃, 200 ℃ and 250 ℃ were investigated. Reticular nanowire structures from PDI self-assembly were observed on CF-PDI surface, leading to the increase of chemical activity and roughness of fiber surface. The partial detachment and decreased surface activity of the nanowire structures of PDI assembly on CF-PDI surface appeared with increasing the temperature, resulting from the weakening of π-π stacking and sectional breakage of intermolecular hydrogen bonding at high temperature. Compared with CF-desized composites, transverse fiber bundle tensile strength and interfacial shear strength were increased by 76.6% and 52.2% at 250 ℃, which was ascribed to the enhanced interfacial bonding between PDI nanowires and BMI matrix. The confocal laser scanning microscope images and grayscale color maps showed the strong green fluorescence on CF-PDI surface and its composites at 25 ℃, while the fluorescence intensity was gradually decreased with the increase of temperature. The fluorescence disappearance of damage region after low-velocity impact damage was observed at 200 ℃ and 250 ℃, which realized damage monitoring at high temperature in CF/BMI composites. © 2024, The Authors. All rights reserved.