长碳纤增强生物基PA56的应用研究

Research on the Application of Long Carbon Fiber Reinforced Bio-based PA56

生物基聚酰胺56(PA56)的合成单体戊二胺来源于生物质转化,为部分可再生材料。基于PA56、碳纤(CF)、增韧剂、抗氧剂、润滑剂等,通过熔融浸渍法制备了一系列长碳纤(LCF)增强PA56材料,对材料的力学性能、导电性能、热老化性能进行了系统研究。对比了LCF、短碳纤(SCF)增强PA56材料的拉伸强度、拉伸模量、缺口冲击性能、表面电阻、热老化性能的差异。结果表明:SCF增强材料韧性不足,添加增韧剂后综合性能改善不明显;相同CF含量下,LCF增强体系的力学性能、导电性能、热老化性能均优于SCF增强体系;适量润滑剂的加入提高了样品中CF保留长度,对LCF增强材料的力学性能、长期热老化性能影响不大,仍可以满足长期耐热应用要求。

The synthetic monomer of bio-based polyamide 56(PA56),pentanediamine,is derived from biomass conversion and is a partially renewable material.A series of long carbon fiber(LCF) reinforced PA56 composites,based on PA56,carbon fiber(CF),toughener,anti-oxidant,lubricant etc.were prepared by melt impregnation method.The mechanical properties,conductivity,and thermal aging properties of the materials were systematically studied.The differences in tensile strength,tensile modulus,notch impact performance,surface resistance,and thermal aging performance between LCF and short carbon fiber(SCF) reinforced PA56 materials were compared.The results show that the toughness of SCF reinforced materials is insufficient,and the comprehensive performance improvement is not significant after adding toughener.Under the same CF content,the mechanical properties,conductivity,and thermal aging performances of LCF reinforced system are better than those of SCF reinforced system.The addition of an appropriate amount of lubricant increases the retention length of CF in the sample,and has little effect on the mechanical properties and long-term thermal aging properties of LCF reinforced materials,which can still meet the requirements of long-term heat resistance applications.