Thermally Stable Polymers: Syntheses and Properties |
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Page 169
... inherent viscosity 0.2-0.3 d1 / g in H2SO4 . The polyamic acid prepolymer is ground , placed in a reactor , degassed , and heated from 220 to 385 ° C at a rate of 1.5 ° C / min and held at 385 ° C for 3 hr . The resulting yellow - brown ...
... inherent viscosity 0.2-0.3 d1 / g in H2SO4 . The polyamic acid prepolymer is ground , placed in a reactor , degassed , and heated from 220 to 385 ° C at a rate of 1.5 ° C / min and held at 385 ° C for 3 hr . The resulting yellow - brown ...
Page 246
... Inherent viscosities ( 0.5 % in H2SO4 ) of the precursor range from 0.6 to 3.0 d1 / g , the highest value being derived from the terephthalic acid and 2,5 - diaminobenzenesulfonamide . The viscosities of the final polymers are similar ...
... Inherent viscosities ( 0.5 % in H2SO4 ) of the precursor range from 0.6 to 3.0 d1 / g , the highest value being derived from the terephthalic acid and 2,5 - diaminobenzenesulfonamide . The viscosities of the final polymers are similar ...
Page 284
... inherent viscosities of 0.21- 0.46 d1 / g in sulfuric or methanesulfonic acids . The final polymer with para catenation showed an inherent viscosity of 0.56 d1 / g in the same solvents and an outstanding stability in nitrogen of 900 ° C ...
... inherent viscosities of 0.21- 0.46 d1 / g in sulfuric or methanesulfonic acids . The final polymer with para catenation showed an inherent viscosity of 0.56 d1 / g in the same solvents and an outstanding stability in nitrogen of 900 ° C ...
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