基于UHMWPE纤维低度交联与表面改性制备高模量、高强度UHMWPE/EP复合材料

Preparation of High-Modulus,High-Strength UHMWPE/Epoxy Composites Based on Low-Degree Fiber Cross-linking and Surface Modification

从工业化生产应用角度研究电晕处理直接作用于超高分子量聚乙烯(UHMWPE)纤维编织布织布表面,探究纤维表面交联和界面改性对复合材料力学性能的影响。利用X射线光电子能谱(XPS)、傅里叶变换红外光谱(ATR-FTIR)和扫描电镜(SEM)对UHMWPE纤维表面物理性质和化学组成进行表征。采用差示扫描量热仪(DSC)对电晕处理前后纤维结晶度和热稳定性进行表征。当电晕处理功率达到3.0 kW时,UHMWPE-C3.0kW/EP复合材料的冲击强度、弯曲强度和弯曲模量达到了167.4 kJ/m 2、121.3 MPa和9.3 GPa,相较于未处理UHMWPE/EP复合材料分别增加了31.5%、64.8%和190.6%。结果表明,通过电晕处理强化了纤维表面与树脂界面黏接强度,有利于复合材料对外力的传递分散,并通过强界面破坏吸收能量及UHMWPE纤维的断裂和形变提高了复合材料的抗冲击和抗弯性能。

From the perspective of industrial production application,the corona treatment directly acted on the surface of ultra-high molecular weight polyethylene(UHMWPE)fiber woven fabric,and explored the influence of fiber surface crosslinking and interface modification on the mechanical properties of composites.X-ray photoelectron spectroscopy(XPS),Fourier transform infrared spectroscopy(ATR-FTIR)and scanning electron microscopy(SEM)were used to characterize the surface physical properties and chemical composition of UHMWPE fibers.Differential scanning calorimetry(DSC)was used to characterize fiber crystallinity and thermal stability before and after corona treatment.With the corona treatment power reaching 3.0 kW,the impact strength,flexural strength and flexural modulus of UHMWPE-C3.0kW/EP composites increase by 31.5%,64.8%and 190.6%respectively comparing with untreated UHMWPE/EP composites to 167.4 kJ/m 2,121.3 MPa and 9.3 GPa.The results show that the interface bonding strength between the fiber surface and the resin is strengthened by corona treatment,which is conducive to the transmission and dispersion of external forces of the composite,and the impact resistance and bending resistance of the composite are improved by the absorption of energy through strong interface destruction and the fracture and deformation of UHMWPE fiber.