Thermally Stable Polymers: Syntheses and Properties |
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Page 131
... dissolved in hot chloroform . Ethanol is added to the boiling chloroform solu- tion until it turns cloudy , and it is then cooled to room temperature . The red powder , which is collected by suction filtration , melts at 338- 340 ° C ...
... dissolved in hot chloroform . Ethanol is added to the boiling chloroform solu- tion until it turns cloudy , and it is then cooled to room temperature . The red powder , which is collected by suction filtration , melts at 338- 340 ° C ...
Page 177
... dissolved in water , the solution filtered , and the free amine precipitated by the addition of dilute aq . potassium hydroxide . The product ( 7.0 g ) is a light tan powder , mp 78-79 ° C . Polymerization The above 2 - phenoxy - 6 ...
... dissolved in water , the solution filtered , and the free amine precipitated by the addition of dilute aq . potassium hydroxide . The product ( 7.0 g ) is a light tan powder , mp 78-79 ° C . Polymerization The above 2 - phenoxy - 6 ...
Page 242
... dissolved in 600 ml of ethanol at -10 ° C with stirring over 15 min . The white H5C6 C6H5 suspension is stirred for 1 hr at -10 ° C and the white solid is iso- lated , washed with cold ethanol , and dried over P205 . The yield is 27 g ...
... dissolved in 600 ml of ethanol at -10 ° C with stirring over 15 min . The white H5C6 C6H5 suspension is stirred for 1 hr at -10 ° C and the white solid is iso- lated , washed with cold ethanol , and dried over P205 . The yield is 27 g ...
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