Thermally Stable Polymers: Syntheses and Properties |
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Page 160
... ( yellow - green ) and can be cast to yellow , trans- parent films . There are , however , two serious problems : hydrolytic and thermal instabilities . Within 3 days in solution , the inherent viscosity drops to one - third of its ...
... ( yellow - green ) and can be cast to yellow , trans- parent films . There are , however , two serious problems : hydrolytic and thermal instabilities . Within 3 days in solution , the inherent viscosity drops to one - third of its ...
Page 169
... yellow - brown friable residue ; 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 ...
... yellow - brown friable residue ; 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 ...
Page 185
... yellow mixture is stirred for 3 hr at 5 ° C and then at room temperature for an additional 18 hr . The resulting highly viscous , yellow mixture is poured into water in a laboratory blendor to precipitate a fibrous yellow solid . This ...
... yellow mixture is stirred for 3 hr at 5 ° C and then at room temperature for an additional 18 hr . The resulting highly viscous , yellow mixture is poured into water in a laboratory blendor to precipitate a fibrous yellow solid . This ...
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