固化温度对苎麻纤维增强复合材料性能的影响

研究了固化温度对苎麻纤维增强复合材料力学性能的影响,同时对比研究了平纹苎麻织物、单向苎麻纤维和单向玻璃纤维增强复合材料的力学性能.结果表明:环氧树脂3233分别在120℃,140℃和l80℃固化2h后,其拉伸性能和弯曲性能没有明显的变化；而基于环氧树脂3233的苎麻纤维增强复合材料在120℃和l40℃固化2h后力学性能相当,但是在180℃固化2h后,强度明显减小,模量变化不大；单向苎麻纤维增强复合材料的力学性能要远远大于平纹苎麻织物增强复合材料的力学性能,如单向苎麻复合材料uRamie-3233-120的压缩强度和压缩模量分别为154.0 MPa和35.6 GPa,而苎麻织物增强复合材料fRamie-3233-120分别为95.0 MPa和9.2 GPa;玻璃纤维增强复合材料的强度也会高明显高于苎麻纤维增强复合材料的强度.

Effect of Cure Temperature on Mechanical Properties of Composite Reinforced by Ramie Fiber

The effect of cure temperature on mechanical properties of unidirectional ramie fiber reinforced composite was studied and the comparative research about mechanical properties of composites reinforced by plain ramie fiber,unidirectional ramie fiber and glass fiber was undertaken.Unobvious change of tensile and flexural properties was detected,when the epoxy resin 3233 was cured for 2h at 120℃,140℃ and 180℃.The ramie fiber reinforced composite had similar mechanical properties after cured for 2h at 120℃,and 140℃,however the composite after cured for 2h at 180℃ had lower tensile strength and flexural strength and comparative modulus.The mechanical properties of unidirectional ramie fiber reinforced composite were much better than those of plain ramie fiber reinforced composite,such as that the compressive strength and compressive modulus of unidirectional ramie fiber reinforced composite uRa mie-3233-120 are 154.0 MPa and 35.6 GPa respectively,however the compressive strength and compressive modulus of plain ramie fiber reinforced composite fRamie-3233-120 are 95 MPa and 9.2 GPa respectively.The unidirectional glass fiber reinforced composite has much better strength,comparative to ramie fiber reinforced composite.