Thermally Stable Polymers: Syntheses and Properties |
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Page 130
... postcure is performed which lowers the solubility of the product . Prior to the postcure polyimidines are very soluble in chloroform and DMF . Thermal stabilities show a classical dependence on aromatic content . The TGA stabilities ...
... postcure is performed which lowers the solubility of the product . Prior to the postcure polyimidines are very soluble in chloroform and DMF . Thermal stabilities show a classical dependence on aromatic content . The TGA stabilities ...
Page 162
... postcure . Occasionally a loss of as much as 37 % was experienced in this postcure , accompanied by " obnoxious " gases . Therefore , although TGA data show a 10 % weight loss to occur at about 750 ° C in nitrogen , they are of limited ...
... postcure . Occasionally a loss of as much as 37 % was experienced in this postcure , accompanied by " obnoxious " gases . Therefore , although TGA data show a 10 % weight loss to occur at about 750 ° C in nitrogen , they are of limited ...
Page 278
... Postcuring A secondary postcure or thermal advancement of the polymer serves to complete cyclization . The following schedule , con- ducted under argon on the above crude polymer before its extraction with chloroform , results in an 8.3 ...
... Postcuring A secondary postcure or thermal advancement of the polymer serves to complete cyclization . The following schedule , con- ducted under argon on the above crude polymer before its extraction with chloroform , results in an 8.3 ...
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