Thermally Stable Polymers: Syntheses and Properties |
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Page 36
... tion of monomers ( equimolar amounts ) in toluene . The solution is degassed by three freeze - thaw cycles in liquid nitrogen and the tube is sealed under vacuum . Then , with toluene used as a heat transfer fluid in a Parr pressure ...
... tion of monomers ( equimolar amounts ) in toluene . The solution is degassed by three freeze - thaw cycles in liquid nitrogen and the tube is sealed under vacuum . Then , with toluene used as a heat transfer fluid in a Parr pressure ...
Page 70
... tion , developed by duPont for its Nomex fiber . This system is essentially a copolyamide of m - phenylene diamine and isophthalic acid , the meta catena- tion providing flexibility : + NH- NH + The order of occurrence of these units ...
... tion , developed by duPont for its Nomex fiber . This system is essentially a copolyamide of m - phenylene diamine and isophthalic acid , the meta catena- tion providing flexibility : + NH- NH + The order of occurrence of these units ...
Page 197
... tion of pyrazinetetracarboxylic acid dianhydride Pyrazinetetra- carboxylic acid is synthesized according to the method of Mager and Berends [ 104 ] and purified by crystallization from constant - boiling hydrochloric acid . The ...
... tion of pyrazinetetracarboxylic acid dianhydride Pyrazinetetra- carboxylic acid is synthesized according to the method of Mager and Berends [ 104 ] and purified by crystallization from constant - boiling hydrochloric acid . The ...
Common terms and phrases
acetone added air or nitrogen aliphatic amide amine anhydride aramids aromatic backbone benzene C. S. Marvel carborane CHâ‚‚ 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