Catalytic preparation of polyimide fibers with excellent properties by the chemical imide method
Enhancing the thermal stability and mechanical properties of intrinsic polymer fiber materials is cur-rently a hot research topic in advanced fiber materials.Polyimide is a high-performance specialty polymer mate-rial with excellent mechanical properties and thermal stability due to its conjugation and benzene ring stacking.Two diamines,4,4'-diaminodiphenyl ether(ODA)and p-phenylenediamine(PDA),were polymerized with 3,3',4,4'-biphenyltetracarboxylic acid dianhydride(BPDA)to form polyamidoacetic acid solution(PAA),and a series of concentration-gradient mixtures were prepared by using different kinds of pyridine mixed with propi-onic anhydride and introduced into PAA.The polyimide fibers were prepared by wet spinning and chemical imi-dization and their microstructures and properties were investigated.The results showed that when the mass fraction of 4-methylpyridine was 4 wt％and n(PAA)∶n(propionic anhydride)=1∶3,the microstructure of the polyimide fiber was a standard cylindrical shape with tensile strength reaching 1.91 GPa.The temperature was as high as 533.3 ℃ at a heat loss of 5％,which exhibited good thermal stability and mechanical properties.
polyimide fiberwet spinningchemical imidizationthermal stability propertiesmorphology and structuremechanical properties
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