Thermally Stable Polymers: Syntheses and Properties |
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Page 148
... pyridine is added and the hydrazine pyridine azeotrope is removed . The solution is then cooled and poured into methanol to precipitate the white fibrous polymer , which is washed with methanol and dried at 50 ° C under vacuum . The ...
... pyridine is added and the hydrazine pyridine azeotrope is removed . The solution is then cooled and poured into methanol to precipitate the white fibrous polymer , which is washed with methanol and dried at 50 ° C under vacuum . The ...
Page 170
... pyridine ) , flexible - film formers [ 88,89 ] . Condensations were run in N , N - dimethylaniline with post cures in refluxing tetralin to give inherent viscosities up to 1.23 d1 / g with molecular weight of 126,000 . N H C6H5 -Si C6H5 ...
... pyridine ) , flexible - film formers [ 88,89 ] . Condensations were run in N , N - dimethylaniline with post cures in refluxing tetralin to give inherent viscosities up to 1.23 d1 / g with molecular weight of 126,000 . N H C6H5 -Si C6H5 ...
Page 186
... pyridine . nately , all polymers obtained by this route were of low molecular weight ( < 6000 ) as evidenced by inherent viscosities under 0.2 d1 / g when measured in concentrated sulfuric acid . Similar polymerizations have since been ...
... pyridine . nately , all polymers obtained by this route were of low molecular weight ( < 6000 ) as evidenced by inherent viscosities under 0.2 d1 / g when measured in concentrated sulfuric acid . Similar polymerizations have since been ...
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