玻璃纤维增强回收聚对苯二甲酸乙二醇酯复合材料的力学性能研究

Mechanical Properties of Recycled Poly(ethylene terephthalate)/Glass Fiber Composites

用熔融共混法制备了玻璃纤维(GF)增强回收聚对苯二甲酸乙二醇酯(rPET)(rPET/GF)复合材料,研究了复合材料的力学性能并进一步利用Halpin-Tsai模型、Krenchel-COX模型和Kelly-Tyson模型探讨了GF的近程和远程结构与复合材料性能间的关系。结果表明,GF对rPET具有较为显著的增强、增韧效果。当玻璃纤维含量为30%(质量分数,下同)时,复合材料的冲击强度、拉伸强度以及弯曲强度分别提高了245%、113%和84%;长径比和取向度是影响rPET/GF复合材料性能的重要结构参数;Halpin-Tsai方程能够较好地描述rPET/GF复合材料中GF的有效长径比;而相比于Krenchel-COX方程,由Kelly-Tyson方程获得的GF的取向度更接近实验结果。

Composites of recycled PET （rPET） filled with glass fiber （GF） were prepared via melt mixing. The mechanical properties of the rPET/GF composites were studied through various models including Halpin-Tsai, Krenchel-COX, and Kelly-Tyson equations, aiming at exploring the relations between the short-term and long-term structures of GF and the properties of composites. It showed that the filled GF had evident reinforcing and toughening effects on the rPET. When the GF loading was 30 wt %, the toughness, tensile and bending strengths increased by about 245%, 113%, and 84%, respectively. The aspect ratio and the orientation of GF constituted two important structural parameters vital to the final properties of composites. The Halpin-Tsai equation could be well used to describe aspect ratio of GF. The orientation factor of GF obtained from Kelly-Tyson equation was closer to the experimental value than that from Krenchel-COX equation.