固化温度对亚麻纤维及其增强复合材料力学性能的影响

研究热压成型过程中,不同固化温度对亚麻纤维及其增强复合材料力学性能的影响。结果表明:亚麻纤维在120,140℃和180℃分别处理2h后单纤维拉伸性能发生不同程度的下降。环氧树脂E-51在120,140℃和180℃下固化2h后拉伸性能未发生明显变化。基于环氧树脂的单向亚麻纱线增强复合材料分别在120℃和140℃固化成型时,拉伸强度和冲击强度变化不大。但当固化温度达到180℃时,由于亚麻纤维在高温环境下损伤较为严重,其增强复合材料的拉伸强度和冲击强度均发生明显的下降。然而复合材料的拉伸模量随着成型温度的升高有一定幅度的提升。

Effect of Curing Temperature on Mechanical Properties of Flax Fiber and Their Reinforced Composites

The effect of different curing temperatures on the mechanical properties of flax fiber and their reinforced composites was studied during hot pressing forming process.The results show that the tensile strength of single flax fiber declines in varying degrees when flax fibers are treated for 2h at 120,140℃ and 180℃,respectively,the tensile strength of epoxy resin E-51 has a little change after treated at the same conditions.Tensile and impact strength change slightly,when unidirectional flax yarn reinforced epoxy resin composites is cured under 120℃ and 140℃.However,when the curing temperature increases to 180℃,owing to the serious damage of flax fiber at high temperature,the tensile and impact strength of the flax fiber reinforced composites then decrease obviously.Mean-while,as the curing temperature increases,the tensile modulus of composites improves in some degree.