CF-CNTs多尺度增强体的制备及CF-CNTs/环氧树脂复合材料力学性能

利用化学气相沉积(CVD)法在碳纤维(CF)表面生长碳纳米管(CNTs),制备了CF-CNTs多尺度增强体,增强体与环氧树脂(EP)结合得到CF-CNTs/EP复合材料。采用场发射扫描电镜(FESEM)、高分辨透射电镜(HRTEM)等方法研究了不同CVD工艺参数对CF-CNTs多尺度增强体的影响,并研究了不同CVD时间对CFCNTs/EP复合材料力学性能的影响。结果表明:沉积温度为500℃、沉积时间为10min、反应压力为0.02 MPa时,制备得到的多尺度增强体性能最好。CF-CNTs多尺度增强体较未生长CNTs的碳纤维与环氧树脂的浸润性明显提高。在CVD时间为10min时,所得CF-CNTs/EP复合材料的界面剪切强度(IFSS)最大可提高90.6%,层间剪切强度(ILSS)最大可提高24.4%。同时,在制备环氧树脂复合材料过程中碳纤维的不加捻与加捻相比,其ILSS提高了11.3%。

Preparation of CF-CNTs multi-scale reinforcement and mechanical properties of CF-CNTs/epoxy composites

The carbon nanotubes (CNTs)were grown on to the surface of carbon fibers (CF)by chemical vapor deposition (CVD)method,the CF-CNTs and CF-CNTs/epoxy (EP)composites were obtained.Effects of different CVD technological parameters on the CF-CNTs multi-scale reinforcement were researched by field emission scanning electron microscopy (FESEM),high resolution transmission electron microscope (HRTEM)methods and so on. Mechanical properties of CF-CNTs/EP composites with different CVD time were also studied.The results show that the CF-CNTs multi-scale reinforcement with the best performance can be obtained when the deposition tempera-ture is 500℃,the deposition time is 10 min,and the corresponding reaction pressure is controlled about 0.02 MPa. The wettability of the CF-CNTs multi-scale reinforcement to EP is significantly higher than that of CF without CNTs.The interfacial shear strength (IFSS)and interlaminar shear strength (ILSS)can be improved by 90.6% and 24.4%,respectively.At the same time,compared to the twisted CF in preparation process of EP composites,the ILSS of non-twisted CF composites can be increased by 11.3%.