Thermally Stable Polymers: Syntheses and Properties |
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Page 181
... acid , or the corresponding nitrile , amide , or ester , with hydrazine or its salt in polyphosphoric ( PPA ) or fuming sulfuric acid ( oleum ) . Iwakura et al . [ 73 ] were the first to use this synthetic route . Their method is an ...
... acid , or the corresponding nitrile , amide , or ester , with hydrazine or its salt in polyphosphoric ( PPA ) or fuming sulfuric acid ( oleum ) . Iwakura et al . [ 73 ] were the first to use this synthetic route . Their method is an ...
Page 182
... acid is an excellent reagent for hydrol- ysis of nitriles to amides and that hydrazine can add directly to nitriles ... sulfuric acid . Presumably , this reaction proceeds through an intermediate polyhydrazide formed by elimination of ...
... acid is an excellent reagent for hydrol- ysis of nitriles to amides and that hydrazine can add directly to nitriles ... sulfuric acid . Presumably , this reaction proceeds through an intermediate polyhydrazide formed by elimination of ...
Page 189
... sulfuric acid [ 64 ] . The solution is cast to a film , gelled in water , and the thermoplastic particles extracted with hot aromatic solvents . The result is a porous polyoxadiazole film . Another approach to a porous , heat resistant ...
... sulfuric acid [ 64 ] . The solution is cast to a film , gelled in water , and the thermoplastic particles extracted with hot aromatic solvents . The result is a porous polyoxadiazole film . Another approach to a porous , heat resistant ...
Common terms and phrases
acetone added air or nitrogen aliphatic amide amine anhydride aramids aromatic backbone benzene C. S. Marvel carborane CHâ‚‚ CH3 CH3 CH3 Chem chloride chloroform condensation cooled copolymer crosslinking crystalline cyclization decomposition diamine dianhydride dl/g DMAC DMSO dried ether fibers films filtration functions groups heated Hergenrother heterocyclic HMPA hydrazide Imai imide inherent viscosity intermediate intrinsic viscosity isolated isothermal Japan Patent ladder m-cresol m-or Macromol materials melt methanol Method mixture is stirred mmol modulus molecular weight monomer NH-C NH2 NH2 NH2 nitrogen oxadiazole oxide P. M. Hergenrother phenyl phenylene poly polyhydrazide polyimides polymerization polyoxadiazoles postcure poured precipitate the polymer Preprints properties pyridine reaction reflux ring room temperature siloxane sodium solid soluble solution solvent structure sulfone sulfuric acid synthesized tensile strength tetraamines thermal stability thiadiazole tion triazole U.S. Patent vacuo vacuum washed weight loss yellow yield