DEVELOPMENT OF HIGHLY HEAT RESISTANT CFRPS PREPARED FROM HIGHLY SOLUBLE, ASYMMETRIC AND ADDITION-TYPE IMIDE RESINS

摘要

Novel addition-type phenylethynyl containing imide oligomers (degree of polymerization: n = 1–rn10) were derived from 1,2,4,5-benzenetetracarboxylic dianhydride (PMDA), 2-phenyl-(4,4'-rndiaminodiphenyl ether) (p-ODA) for use as the matrix resin of highly heat-resistant carbon fiberreinforcedrncomposites. The uncured imide oligomers showed good solubility (more than 30 wtrn%) in N-methyl-2-pyrrolidone (NMP) and very low melt viscosities. These imide oligomers werernconverted to cross-linked structures after curing at 370 ℃. The glass transition temperature andrnelongation at break (ε_b) of the cured imide resin were found to be excellent (almost 340 ℃ andrn>15 %, respectively). Furthermore, imide solution prepregs were prepared from the imidernoligomer solution and carbon fibers. A void-less polyimide/carbon fiber composite with high Tgrnwas also achieved for fabrication via the imide solution prepregs.