热氧老化对长玻璃纤维增强聚酰胺6复合材料的影响  

Effect of thermal-oxidative aging on long glass fiber reinforced PA 6 composites

作　　者：左晓玲[1] 邵会菊[1] 黄安荣[1] 郝智[1] 郭建兵[1] 

机构地区：[1]贵州大学材料与冶金学院,国家复合改性聚合物材料工程技术研究中心,贵州省贵阳市550025

出　　处：《合成树脂及塑料》2013年第5期66-70,共5页China Synthetic Resin and Plastics

基　　金：贵州省重大专项[(2011)6018];贵州省科技计划[黔科合GY字(2013)3026];贵州大学创新基金(研理工2013067)

摘　　要：研究了160℃条件下不同热氧老化时间对未添加抗氧剂和添加抗氧剂的长玻璃纤维(LGF)增强聚酰胺(PA)6(PA 6/LGF)复合材料力学性能、热稳定性、结晶度及表面形貌的影响,并采用热重分析,差示扫描量热法分析和扫描电子显微镜观察对PA 6/LGF复合材料进行了表征。结果表明:PA 6基体分子链的断裂、降解以及LGF与PA 6基体的脱黏导致了PA 6/LGF复合材料宏观力学性能、熔融温度、结晶温度、结晶度以及热稳定性的下降。添加抗氧剂的PA 6/LGF复合材料拉伸强度保持率为83.9%,而未添加抗氧剂的复合材料则为76.8%。添加抗氧剂能使PA 6/LGF复合材料具有相对优异的力学性能保持率。The authors studied the effect of different thermal-oxidation exposure time on the mechanical properties, thermal stability, crystallinity and surface morphology of long glass fiber （LGF） reinforced polyamide （PAL） 6 （PA 6/LGF） composites with or without the antioxidant at 160 ℃. The PA 6/LGF composites were characterized by thermogravimetry （TG）, differential scanning calorimetry （DSC） and scanning electronic microscopy （SEM）. The results indicate that the mechanical properties, melting temperature, crystallization temperature, crystallinity and thermal stability decrease due to fracture and decomposition of the molecular chain of PA 6 matrix and debonding of the interface between LGF and PA 6 matrix. The tensile strength retention of the PA 6/LGF composite with the antioxidant is 83.9%, while that of the composite without the antioxidant is 76.8%. The existence of the antioxidant endows the PA 6/LGF composites with relatively excellent retention of the mechanical properties.

关 键 词：聚酰胺6 长玻璃纤维 增强 热氧老化 力学性能 抗氧剂 

分 类 号：TQ327.1[化学工程—合成树脂塑料工业]