Performance of PA6 reinforced with glass fibers of different cross-sectional types
The mechanical properties,flow performance,shrinkage and warping,friction performance and linear expansion coefficient(CLTE)of flat glass fiber and circular glass fiber reinforced nylon 6(PA6)composite materials were compared and studied.The results show that as the glass fiber content increases,the mechanical properties of flat glass fiber and circular glass fiber reinforced PA6 composites increase,but the melt melt flow rate(MFR)decreases.At the same glass fiber content,compared with circular glass fiber,flat glass fiber reinforced PA6 composites have lower tensile strength,flexible strength and flexible modulus,while the notched impact strength and MFR of simply supported beams are higher.At the condition of 30% glass fiber content,there are differences in the performance of different flat ratio glass fibers and circular glass fiber reinforced composite materials.Through shrinkage rate testing analysis,flat glass fiber composite materials have lower shrinkage rates and transverse and longitudinal shrink-age ratios compared to circular glass fibers.The higher the flat ratio,the lower the transverse and longitudinal shrinkage ratio,and the smaller the warpage.Through MFR testing and injection molding spiral line testing,flat glass fiber composite materials have better fluidity,higher flow length ratio,and the higher the flat ratio,the more obvious the advantage,which is conducive to molding processing.Through the sliding friction test results,it can be seen that the flat glass fiber composite material has a lower friction coefficient.As the flatness ratio increases,the friction coefficient decreases;Through thermal mechanical analysis,it is found that the CLTE of flat glass fiber composite materials in the vertical flow direction is lower than that of circular glass fibers,and the differ-ence in CLTE between the flow direction and the vertical flow direction is also small.Flat glass fiber reinforcement materials can solve some inherent problems of traditional circular glass fiber reinforcement systems and improve product performance.
NETL
NSTL
万方数据
