聚酰亚胺-聚四氟乙烯复合材料的制备和表征

Teflon

聚酰亚胺-聚四氟乙烯复合材料的制备和表征
Preparation and characterization of PI-PTFE compsite materials
作　　者：王晓东 朱辅华 黄培

WANG Xiaodong,ZHU Fuhua,HUANG Pei（College of Chemistry and Chemical Engineering,Nanjing University of Technology,Nanjing 210009,China）

机构地区：南京工业大学化学化工学院,江苏南京210009

出　　处：《南京工业大学学报：自然科学版》 2011年第33卷第4期 16-19页,共4页

Journal of Nanjing University of Technology

摘　　要：利用共混挤出工艺制备聚酰亚胺-聚四氟乙烯（PI-PTFE）复合材料,考察PTFE含量对复合材料热性能、摩擦性能及力学性能的影响。结果表明：制得的PI-PTFE复合材料两相不相容,复合材料的最高使用温度为250℃,在250℃以下复合材料的尺寸稳定性较好,其线膨胀系数随PTFE含量的增加而增大,不受热循环历程的影响;复合材料分解质量损失5%的温度（t5d）为525℃,热分解速率随PTFE含量的增加而增大;干摩擦时,随PTFE含量的增加,复合材料的摩擦因数降低,磨损率呈上升趋势;复合材料的拉伸强度、弯曲强度和硬度均随PTFE含量的增加而降低,就力学性能而言,PTFE的添加量不超过20%为宜。

Polyimide-polytetrafluoroethylene（PI-PTFE） composite materials were prepared by mixing-extrusion processing.The influence of the composition on the thermal properties,mechanical properties,and tribological behavior of composites was investigated.Results showed that phase separation was observed in the composite.The maximum application temperature was 250 ℃ with a better dimensional stability.The coefficient of thermal expansion was unaffected by thermal circles and increased with the increase of PTFE contents,and the t5d was 525 ℃.The thermal decomposition rate increased with the increase of PTFE contents.In a dry friction environment with the increase of the PTFE contents,the coefficient of friction reduced while the wear rate increased.Meanwhile,the tensile strength,flexural strength and hardness decreased with the increase of PTFE contents.The suitable amount of PTFE in the PI-PTFE composite materials was lower than 20%.

关键词：聚酰亚胺 聚四氟乙烯 复合材料
polyimide ; polytetrafluoroethylene ; compsite materials ;

分类号：TQ323 [工业技术 > 化学工业 > 合成树脂与塑料工业]

全文快照：and characterization of PI-PTFE compsite materials WANG Xiaodong，ZHU Fuhua，HUANG Pei (College of Chemistry and Chemical Engineering，Nanjing University of Technoh)gy，Nanjing 210009，China) Abstract：Polyimide—polytetrafluoroethylene(PI—PTFE)composite materials were prepared by mixing—ex—trusion processing．The influence of the composition on the thermal properties，mechanical properties，and tribological behavior of composites was investigated．