玻璃纤维增强PBT材料的热氧老化性能研究

Research on Thermo-oxidative Ageing Property of Glass Fiber Reinforced PBT Materials

以玻璃纤维增强聚对苯二甲酸丁二醇酯(PBT)材料为研究对象,探讨了受阻酚类抗氧剂、亚磷酸酯类抗氧剂、有机硫类抗氧剂与碳自由基捕捉剂等不同抗氧体系对PBT材料热稳定性、力学性能保持率与抗黄变性等热氧老化性能的影响。结果表明,采用添加碳自由基捕捉剂抗氧体系的PBT材料加工过程中热稳定性与耐黄变性能最好;采用亚磷酸酯类抗氧剂的PBT材料加工过程中耐黄变性能更好;采用有机硫类抗氧剂的PBT材料长期热氧老化过程中力学性能保持率与耐黄变性能最好;受阻酚抗氧剂、有机硫类抗氧剂与碳自由基捕捉剂复配的三元抗氧体系既可保证材料加工过程中热稳定性与耐黄变性能,又可改善材料长期热氧老化过程中力学性能保持率与耐黄变性能。

To take the glass fiber reinforced polybutylene terephthalate （PBT） materials for example, the effects of hindered phenol antioxidant, phosphite antioxidant, thio ester antioxidant and carbon-centered radical scavenger on the thermostability, retention rate of mechanical properties and yellow degeneration resistance of PBT were investigated. The results indicate that the thermostability and yellow degeneration resistance during the processing of PBT using carbon-centered radical scavenger are the best. The retention rate of mechanical properties and yellow degeneration resistance in long-term thermo-oxidative ageing of PBT using thio ester antioxidant are the best. The thermostability and yellow degeneration resistance during the processing and the retention rate of mechanical properties and yellow degeneration resistance in long-term thermo-oxidative ageing of PBT using hindered phenol antioxidant, thio ester antioxidant and carbon-centered radical scavenger are the best.