Thermally stable polymers: syntheses and properties

acetone added air or nitrogen aliphatic amide amine anhydride backbone benzene C. S. Marvel carborane Chem chloride chloroform condensation cooled copolymer crosslinking crystalline cyclization decomposition diamine dianhydride dissolved dl/g DMAc DMSO dried ether ferrocene fibers films filtration flask functions groups heated at reflux Hergenrother heterocyclic HMPA hydrazide Imai imide inherent viscosity intermediate intrinsic viscosity isolated isothermal Japan Patent ladder loss by TGA m-cresol Macromol Macromolecules materials melt methanol Method mixture is stirred mmol modulus molecular weight monomer nitrogen oxadiazole oxide P. M. Hergenrother pendant phenyl phenylene poly polyhydrazide polyimides polymerization polyoxadiazoles polyphenylene postcure poured precipitate the polymer Preprints properties pyridine reaction room temperature siloxane sodium solid soluble solution solvents structure sulfone sulfuric acid synthesized thermal stability tion triazole U.S. Patent vacuo vacuum washed weight loss yellow yield