Thermally Stable Polymers: Syntheses and Properties |
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Page 32
... heated at reflux for 2 hr in dilute HC1 , washed with hot water , and dried . The solid is then heated at reflux in methanol for 10 hr , and the dark brown product is extracted with benzene . The filtrate is treated with petroleum ether ...
... heated at reflux for 2 hr in dilute HC1 , washed with hot water , and dried . The solid is then heated at reflux in methanol for 10 hr , and the dark brown product is extracted with benzene . The filtrate is treated with petroleum ether ...
Page 104
... heated to reflux for 12 hr . The volume was reduced to one - third and the residue added to ethanol to precipitate the polyimide . The polymer is dissolved in DMF and reprecipitated in ethanol to yield a dark yellow solid upon drying ...
... heated to reflux for 12 hr . The volume was reduced to one - third and the residue added to ethanol to precipitate the polyimide . The polymer is dissolved in DMF and reprecipitated in ethanol to yield a dark yellow solid upon drying ...
Page 131
... heated for 1 day at 150 ° C , and the temperature is increased at a rate of ... reflux for about 36 hr . The red solu- tion is filtered hot and steam ... heated to reflux . The red solution gradually decolorizes in 6 hr ; whereupon the ...
... heated for 1 day at 150 ° C , and the temperature is increased at a rate of ... reflux for about 36 hr . The red solu- tion is filtered hot and steam ... heated to reflux . The red solution gradually decolorizes in 6 hr ; whereupon the ...
Common terms and phrases
acetone added air or nitrogen aliphatic amide amine anhydride aramids aromatic backbone benzene C. S. Marvel carborane CH₂ 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