Surface modification of bamboo fibers to enhance the interfacial adhesion of epoxy resin-based composites prepared by resin transfer molding

Bamboo fibers (BFs)-reinforced epoxy resin (EP) composites are prepared by resin transfer molding (RTM). The influence of BFs surface modification (NaOH solution or coupling agents, i.e., KH550 and KH560) on interfacial properties of BFs/EP composites is systematically investigated. The synergistic e ect of hydrolysis, peeling reaction of BFs, and the condensation reaction of hydrolyzed coupling agents are confirmed by FTIR. Scanning electron microscopy (SEM) and atomic force microscopy (AFM) reveal that the interfacial compatibility of NaOH- and silane-modified BFs/EP composites was significantly improved.

采用树脂传递模塑（resin transfer molding, RTM）法制备竹纤维（Bamboo fibers, BFs）增强环氧树脂（Epoxy resin, EP）复合材料。系统研究了竹纤维表面改性（采用氢氧化钠溶液或偶联剂，即KH550与KH560）对竹纤维/环氧树脂复合材料界面性能的影响。通过傅里叶变换红外光谱（Fourier Transform Infrared Spectroscopy, FTIR）证实了竹纤维水解、剥蚀反应与水解后偶联剂缩合反应之间的协同效应。扫描电子显微镜（Scanning Electron Microscopy, SEM）与原子力显微镜（Atomic Force Microscopy, AFM）分析结果显示，经氢氧化钠和硅烷改性的竹纤维/环氧树脂复合材料的界面相容性得到显著提升。