Zhang Si, Ji Shiyu, Wang Zifan, Zhang Jian, Zhao Wei, He Chaoshuai, Chen Yun
School of Mechanical Engineering, Jiangsu University of Science and Technology, Zhenjiang 212000, China.
Nanomaterials (Basel). 2022 Dec 18;12(24):4486. doi: 10.3390/nano12244486.
Inspired by the mineral bridge between hard phase layers of natural nacre, the biomimetic modified silicon carbide nano-whiskers (MSiCw)/graphene oxide sheets (MGO) reinforced polyimine (PI) composites (MSiCw-MGO-PI) were successfully prepared by heat-pressing at room temperature, which confirmed by FTIR, XPS, and XRD tests. According to the results of mechanical tests, the composites with filling weights of MSiCw and MGO, which were found to be 1% and 0.3%, presented tensile strength of 94.27 MPa, which was 32% higher than the matrix. With the additional weights amount of 1%MSiCw and 0.2%MGO, the impact strength of the composites reached 17.46 KJ/m, which was increased by 81% compared with the matrix. In addition, the reinforcing mechanisms, such as the bridging principle and mechanism of whiskers pulling out, were investigated by analyzing the fracture surface of MSiCw-MGO-PI composites. The results showed that MSiCw and MGO can synergistically improve the mechanical properties of the composites. In addition, the recyclability of the composites valued by the mechanical properties of the composites from regrinding and heat pressing showed that three generations of MSiCw-MGO-PI composites can still maintain high mechanical properties on account of the better dispersion of the reinforcing phases in the matrix from regrinding.
受天然珍珠母硬相层间矿物桥的启发，通过室温热压成功制备了仿生改性碳化硅纳米晶须（MSiCw）/氧化石墨烯片（MGO）增强聚酰亚胺（PI）复合材料（MSiCw-MGO-PI），这通过傅里叶变换红外光谱（FTIR）、X射线光电子能谱（XPS）和X射线衍射（XRD）测试得到证实。根据力学测试结果，发现MSiCw和MGO填充重量分别为1%和0.3%的复合材料的拉伸强度为94.27 MPa，比基体高32%。当额外添加1%MSiCw和0.2%MGO时，复合材料的冲击强度达到17.46 KJ/m，与基体相比提高了81%。此外，通过分析MSiCw-MGO-PI复合材料的断裂表面，研究了诸如桥连原理和晶须拔出机制等增强机理。结果表明，MSiCw和MGO可以协同提高复合材料的力学性能。此外，通过对复合材料进行再研磨和热压后的力学性能评估其可回收性，结果表明，由于再研磨后增强相在基体中具有更好的分散性，三代MSiCw-MGO-PI复合材料仍能保持较高的力学性能。
