Thermally Stable Polymers: Syntheses and Properties |
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Page 75
... nitrogen . By far the most sig- nificant difference between stabilities in air and nitrogen occurred with the ethylene diamine - toluoylisophthaloyl system . An improvement of 145 ° C in thermal stability was demonstrated by using a ...
... nitrogen . By far the most sig- nificant difference between stabilities in air and nitrogen occurred with the ethylene diamine - toluoylisophthaloyl system . An improvement of 145 ° C in thermal stability was demonstrated by using a ...
Page 171
... nitrogen for 5 hr . Then about 65 ml of DMAC is removed by vacuum distillation , and the residue is poured into 100 ml of water to precipitate a cream - colored polymer . The solid is isolated by fil- tration , washed well with water ...
... nitrogen for 5 hr . Then about 65 ml of DMAC is removed by vacuum distillation , and the residue is poured into 100 ml of water to precipitate a cream - colored polymer . The solid is isolated by fil- tration , washed well with water ...
Page 304
... nitrogen - purged , equilibrating funnel with anhydrous ethyl ether ( 100 ml ) . A l - liter , three - necked flask is dried , purged with nitrogen , and fitted with a mechanical stirrer , Dry Ice condenser , and mercury overpressure ...
... nitrogen - purged , equilibrating funnel with anhydrous ethyl ether ( 100 ml ) . A l - liter , three - necked flask is dried , purged with nitrogen , and fitted with a mechanical stirrer , Dry Ice condenser , and mercury overpressure ...
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