Effect of environmental hygroscopicity on properties of GF reinforced nylon 66 materials
By studying the hygroscopic states of two kinds of glass fiber(GF)reinforced nylon(PA)[GF reinforced PA66(A3WG6,BASF),referred to as composite A,self-made PA66+30%GF,referred to as composite B]after adjustment of different time under ambient temperature and humidity conditions,the relationship between the tensile strength,tensile modulus,tensile strain,impact strength and shrinkage rate of PA composites after adjustment of different time and adjustment time was discussed.The relationship between the adjusting time and the moisture content of the material at room temperature was investigated,and the mechanism of the influence of moisture on the properties of the PA composites was analyzed.The results show that in the experimen-tal range,the moisture absorption rate of PA composites in normal temperature environment increases with the extension of regula-tion time.The environmental moisture absorption rate reaches the highest at 16 h,and tends to be stable after 168 h.The tensile strength of PA composites decrease gradually with the extension of adjusting time,the tensile strain and tensile modulus change rela-tively little,and the impact strength increase gradually with the extension of adjusting time.When PA 66 composites A and B are adjusted under ambient temperature and humidity conditions for 168 h,the water content of the composites is 0.207%and 0.145%respectively.The tensile strength of PA composites decrease by 14 MPa and 15.3 MPa respectively,and the loss rate reach 6.9%and 7.8%.When PA composites A and B are adjusted for 960 h under ambient temperature and humidity conditions,the water content of the composites is 0.578%and 0.439%,respectively.The tensile strength of the composites decrease by 38 MPa and 35 MPa,the loss rate reach 18.6%and 18.2%,respectively,and the impact strength of the composites increase by 12.3%and 45.7%.The physical and mechanical properties,hygroscopic state of PA 66 composite A and B show the same trend after adjusting for different time under the same ambient temperature and humidity conditions.
glass fiber reinforced nylon compositehygroscopicmoisture contentperformanceadjust time
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