亚麻纤维增强聚乳酸复合材料的制备与性能表征

Fabrication and characterization of flax fiber reinforced polylactic acid composite

针对预成型件的铺层角度对复合材料力学性能产生影响的问题,以亚麻纤维为增强体,与聚乳酸纤维通过开松、混合、梳理工序制成预成型件后,采用模压成型工艺制备了亚麻纤维/聚乳酸复合材料。研究预成型件的各种铺层角度对复合材料拉伸、弯曲性能的影响,并通过扫描电镜讨论亚麻/聚乳酸复合材料的破坏机制以及拉伸断裂形貌。结果表明:铺层角度为90°时,复合材料横向拉伸、弯曲强度和模量最高;铺层角度为0°时,复合材料纵向拉伸、弯曲强度和模量最高。

Since changing the angle of layer of performs will have an effect on the mechanical property of the composite, flax fiber was used as the reinforcing material in preparing the prefabricated material with polylactic acid fiber which had been subjected to opening, blending and carding. Then the prefabricated material was shaped into flax/PLA fiber composites by mould pressing technology. The effects of changing the different angle of layer of performs on the tensile and flexural strength of composite were studied, and the fracture mechanisms and fraction morphology of the composite were discussed by using scanning electron microscopy. The results show that the angle of layer of the composite at 90° has the best horizontal orientation tensile, blending strength and module; at 0° has the best vertical orientation tensile, bending strength and module.