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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。
The rPET / rPET / GF composites reinforced with glass fiber (GF) were prepared by melt blending method. The mechanical properties of the composites were investigated and the Halpin-Tsai model was further used. Krenchel -COX model and the Kelly-Tyson model were used to investigate the relationship between GF’s short-range and long-range structures and the properties of composites. The results showed that GF had a significant enhancement and toughening effect on rPET. The impact strength, tensile strength and flexural strength of the composites increased by 245%, 113% and 84%, respectively, when the glass fiber content was 30% (mass fraction) GF composite material. The Halpin-Tsai equation can well describe the effective aspect ratio of GF in rPET / GF composites. Compared with the Krenchel-COX equation, the orientation of GF obtained from the Kelly-Tyson equation Degree closer to the experimental results.