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以纤维束混合的方式制备脂肪族聚酯和天然亚麻纤维复合材料。研究了加工条件对纤维长度分布的影响以及复合材料的力学性能对纤维含量的依赖性。依据纤维取向度效率系数(η0)的广义混合规律方程,复合材料的拉伸模量随纤维含量变化而变化。随纤维的加入,聚酯/亚麻复合材料的强力趋于减小,这表明基体树脂与增强纤维之间无黏合。为改善基体树脂与纤维之间的黏合作用,对经表面化学改性的亚麻纤维进行了测试。结果表明:当复合材料中体积分数25%的天然纤维被含有醋酸基的纤维所替代时,其强力将增加30%;含有戊酸盐基或表面接枝聚乙二醇链纤维的复合材料强力并无明显变化。
Aliphatic polyester and natural flax fiber composites were prepared by means of fiber bundles. The effects of processing conditions on the fiber length distribution and the dependence of the mechanical properties of the composites on the fiber content were investigated. According to the generalized mixing law of fiber orientation efficiency coefficient (η0), the tensile modulus of the composites varies with the fiber content. With the addition of fibers, the strength of the polyester / linen composites tends to decrease, indicating no binding between the matrix resin and the reinforcing fibers. To improve the adhesion between the matrix resin and the fibers, the surface chemically modified flax fibers were tested. The results show that when the volume fraction of natural fiber in the composite is 25%, the strength of the composite fiber is increased by 30% when it is replaced by the cellulose acetate-containing fiber. The composite containing valerate or surface grafted polyethylene glycol fiber No significant change.