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采用氢氧化钠和异氰酸酯处理的界面调控方法对竹纤维(BF)增强聚乳酸(PLA)复合材料界面进行调控,通过注射成型工艺制备BF/PLA复合材料。利用FTIR、XRD、凝胶渗透色谱及SEM等分析手段研究了BF/PLA复合材料热老化性能。研究发现:热老化过程中PLA分子链中的C-O不断水解,分子链的C—O断裂生成聚合度更低的小分子量的PLA,PLA结晶度减小,PLA与BF的接合界面被破坏,拉伸强度和冲击强度随老化时间的增加逐渐降低。BF/PLA复合材料在80℃热老化16天后拉伸强度和冲击强度分别降低了75%和77.6%,在100℃热老化32h后拉伸强度和冲击强度分别降低了80.3%和83.4%。温度对BF/PLA复合材料老化影响显著,温度越高,老化速度越快。
The interface between sodium hydroxide and isocyanate was used to control the interface of PLA fiber reinforced composite (PLA) composites. The BF / PLA composites were prepared by injection molding. The thermal aging properties of BF / PLA composites were investigated by means of FTIR, XRD, gel permeation chromatography and SEM. It was found that the CO in the molecular chain of PLA continuously hydrolyzed during heat aging and the C-O of the molecular chain was broken to generate PLA with a lower degree of polymerization. The crystallinity of PLA decreased and the interface between PLA and BF was destroyed. Tensile strength and impact strength decreased with increasing aging time. The tensile strength and impact strength of BF / PLA composites decreased by 75% and 77.6% respectively after heat aging at 80 ℃ for 16 days. The tensile strength and impact strength decreased by 80.3% and 83.4% respectively after heat aging at 100 ℃ for 32h. Temperature has a significant effect on the aging of BF / PLA composites. The higher the temperature, the faster the aging.