短切碳纤维增强聚酰亚胺泡沫的制备及性能

针对现有软质聚酰亚胺泡沫强度低的缺点,通过一步法制备了短切碳纤维增强聚酰亚胺泡沫,研究了短切碳纤维的添加量对聚酰亚胺泡沫的化学结构、微观形貌、压缩强度及热导率的影响。结果表明,短切碳纤维在发泡过程中起到成核剂的作用,随着其添加量的增加,泡沫的泡孔平均尺寸先减小后增加;当短切碳纤维质量分数为20%时,泡孔的最小平均尺寸为507μm;泡沫密度随着短切碳纤维用量的变化没有明显的改变;泡沫的压缩强度随着短切碳纤维的用量先增大后逐渐减小,压缩强度最大为54.52 kPa;短切碳纤维的加入对聚酰亚胺泡沫材料的化学结构和热稳定性没有明显的影响,但是材料的热导率随着短切碳纤维含量的增加有一定的增加。

Preparation and Properties of Chopped Carbon Fiber Reinforced Polyimide Composite Foams

Aiming at the low strength of current soft polyimide foams, a series of chopped carbon fiber (CF) reinforced polyimide (PI) composite foams were fabricated by one-step method. The effects of the content of CF on chemical structure, microstructure and other properties of PI composite foams were investigated. The results show that the CF acts as nucleation agent in the foaming process. The cell size of the foams decreases with the increase of the content of CF firstly, reaches the minimum value 507μm with the CF content at 20% and then increases. However,the change of the density is unclearly. The compressive strength increases firstly and then decreases with the loading of CF,obtaining the maximum strength 54.52 kPa. There is no significant influence on foams'chemical structure and thermal stability. Nevertheless,the thermal conductivity increases by the loading of CF.