PAI Materials Synthesized by 4,4'-Diaminodiphenyl ether/2,2'-Bis (trifluoromethyl)-4,4'-diaminophenyl ether and Their Properties.

In this paper, 4,4'-diaminodiphenyl ether and 2,2'-bis (trifluoromethyl)-4,4'-diaminophenyl ether are selected for molecular structure design, and PAI materials are synthesized by acyl chloride method. 2,2'-bis (trifluoromethyl)-4,4'-diaminophenyl ether has the same main chain structure as 4,4'-diaminodiphenyl ether, but the side chain contains two trifluoromethyl groups, which has high fluorine content. PAI terpolymers were prepared by compounding two diamine monomers, and the effects of trifluoromethyl on heat resistance, friction and wear properties, hydrophobic properties and mechanical properties of PAI materials were studied. The results showed that with the increase of trifluoromethyl content, the Tg of PAI material first increased and then changed little, and the Td