Thermally Stable Polymers: Syntheses and Properties |
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Page 169
... g in H2SO4 . The polyamic acid prepolymer is ground , placed in a reactor , degassed , and heated from 220 to 385 ... dl / g in HSO4 ) with no crosslinking . Other advantages are easy removal of byproducts , facile deaeration , and ready ...
... g in H2SO4 . The polyamic acid prepolymer is ground , placed in a reactor , degassed , and heated from 220 to 385 ... dl / g in HSO4 ) with no crosslinking . Other advantages are easy removal of byproducts , facile deaeration , and ready ...
Page 226
... g ) and solubility ( in DMF ) superior to the earlier products . Brittle films could be cast , but decomposition ... dl / g , with one example of 1.24 dl / g . Solubilities 226 Six - Member Rings Heterocyclic Polymers :
... g ) and solubility ( in DMF ) superior to the earlier products . Brittle films could be cast , but decomposition ... dl / g , with one example of 1.24 dl / g . Solubilities 226 Six - Member Rings Heterocyclic Polymers :
Page 246
... dl / g ) , which is reduced by cyclization even with tributylamine ( to 2.63 d1 / g ) . The thermal properties of the cyclized polymers are good and similar in either air or nitrogen . Weight losses of 10 % by TGA are observed to occur ...
... dl / g ) , which is reduced by cyclization even with tributylamine ( to 2.63 d1 / g ) . The thermal properties of the cyclized polymers are good and similar in either air or nitrogen . Weight losses of 10 % by TGA are observed to occur ...
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