热老化对玻璃纤维增强聚对苯二甲酸丁二醇酯（GF/PBT）复合材料力学性能和形态的影响

Effect of Thermal Aging on Mechanical Properties and Morphology of GF/PBT Composites.

作者信息

Xu Xiuqi, Deng Jiangang, Nie Siyu, Lan Zhenbo, Xu Zhuolin

机构信息

Department of Electrical Engineering and Automation, China Three Gorges University, Yichang 443002, China.

Wuhan Nari Limited Liability Company of State Grid Electric Power Research Institute, Wuhan 430074, China.

出版信息

Polymers (Basel). 2023 Sep 18;15(18):3798. doi: 10.3390/polym15183798.

DOI:10.3390/polym15183798

PMID:37765652

原文链接:https://pmc.ncbi.nlm.nih.gov/articles/PMC10534368/

Abstract

The effects of thermal aging at 85~145 °C in air on the tensile and flexural mechanical properties of 20% glass fiber (GF)-reinforced commercial grade polybutylene terephthalate (PBT) composites were studied. The results showed that as the aging temperature increased, the tensile and flexural strength of the GF/PBT composites significantly decreased. However, the elastic modulus of the composites was almost independent of aging. As the aging temperature increased, the separation between GF and the PBT matrix became more pronounced, and the fibers exposed on the surface of the matrix became clearer and smoother, indicating a decrease in interfacial adhesion between the PBT matrix and GF. The reason for this decrease in strength and brittle fracture of composites is the interface damage between the GF and PBT matrix caused by the difference in their thermal expansion coefficients during thermal aging.

摘要

研究了在空气中85~145°C热老化对20%玻璃纤维（GF）增强商业级聚对苯二甲酸丁二醇酯（PBT）复合材料拉伸和弯曲力学性能的影响。结果表明，随着老化温度的升高，GF/PBT复合材料的拉伸强度和弯曲强度显著降低。然而，复合材料的弹性模量几乎与老化无关。随着老化温度的升高，GF与PBT基体之间的分离变得更加明显，基体表面暴露的纤维变得更清晰、更光滑，表明PBT基体与GF之间的界面粘结性降低。复合材料强度降低和脆性断裂的原因是热老化过程中GF与PBT基体之间由于热膨胀系数差异而导致的界面损伤。