Investigations On Drawing And Tensile Properties Of Modified Polyamide6Fibers

The drawing and ultimate tensile properties of the modified NY6fiber specimens prepared at varying drawing temperature were systematically investigated, wherein the modified NY6resins were prepared by reactive extrusion of NY6with the maleic anhydride graft polyethylene (PE-g-MAH) or nylon6clay(NYC). At any fixed drawing temperature, the achievable draw ratio (Dra) values of the modified NY6as-spun fiber specimens increase initially with increasing PE-g-MAH or NYC contents, and then approach a maximum value, as their PE-g-MAH or NYC contents are close to the8wt%or0.5%optimum value. The maximum Dra values obtained for the modified NY6as-spun fiber specimens prepared at the optimum PE-g-MAH or NYC content reach another maximum as their drawing temperatures approach the optimum drawing temperature at120℃. High power wide angle X-ray diffraction (WAXD) and thermal analyses found that percentage crystallinity (Xc) values of NY6x(NYC)y as-spun fiber specimens increased significantly, as their NYC contents increased from0to2wt%. As revealed by WAXD analysis, a form NY6crystals grew at the expense of y form NY6crystals originally present in NY6x(NYC)y as-spun fiber specimens as their draw ratios increased. The tenacity and orientation values of NY6and the modified NY6fiber specimens improve consistently as their draw ratios increase. Similar to those found for their achievable drawing properties, the ultimate tenacity and orientation values of the modified NY6fiber specimens approach a maximum value, as their PE-g-MAH or NYC contents and drawing temperatures approach the8wt%or0.5%and120℃optimum values, respectively. Investigations including Fourier transform infrared, melt shear viscosity, MFR, thermal and wide angle X-ray diffraction experiments were performed on the the modified NY6resin and/or fiber specimens to clarify the optimum PE-g-MAH or NYC content and possible deformation mechanisms accounting for the interesting drawing, orientation and ultimate tensile properties found for the modified NY6fiber specimens prepared in this study.