封端异氰酸酯上浆剂改善碳纤维/聚酰胺6复合材料界面相互作用OA

To enhance the interfacial properties of carbon fiber(CF)-reinforced polyamide 6(CF/PA6)composites,a novel blocked isocyanate(BI)/polyurethane(PU)sizing agent was prepared by dispersing BI in an aqueous PU emulsion.It was then applied to the CF surfaces for modification via a room-temperature sizing method.The results indicated that the BI/PU sizing layer significantly enhanced CF surface wettability,facilitating impregnation of PA6 resin onto fibers.With the increase in BI content,the interfacial shear strength(IFSS)of CF/PA6 composites was enhanced.The IFSS of the desized CF/PA6 composites was 46.8 MPa.When the sizing agent with a BI mass fraction of 3.0%was applied,the IFSS of the CF/PA6 composite reached 62.3 MPa,which represented an increase of 33.1%compared with that of the desized CF/PA6 composite.The proposed method offers an efficient and scalable surface modification strategy for high-performance thermoplastic composites.