Thermally Stable Polymers: Syntheses and Properties |
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Page 179
... polyhydrazides . This last method offered the advantage of a soluble and processable intermediate polyhydrazide polymer , which can be cast to films , spun to fibers , etc. Once formed , articles are converted by heat treatment to the ...
... polyhydrazides . This last method offered the advantage of a soluble and processable intermediate polyhydrazide polymer , which can be cast to films , spun to fibers , etc. Once formed , articles are converted by heat treatment to the ...
Page 181
... polyhydrazide precursor is prepared by the method of Frazer and Wallenberger [ 41 ] . The dried N N - N || N ။ C polyhydrazide is ground to a fine powder and heated in a muffle furnace under dry N2 at 280 ° C for 24 hr to give ...
... polyhydrazide precursor is prepared by the method of Frazer and Wallenberger [ 41 ] . The dried N N - N || N ။ C polyhydrazide is ground to a fine powder and heated in a muffle furnace under dry N2 at 280 ° C for 24 hr to give ...
Page 182
... polyhydrazide which then loses water to form poly ( 1,3,4 - oxadiazole ) . This reaction is analogous to the method discussed above , except that in the present case the polyhydrazide is generated in situ and not isolated . It is ...
... polyhydrazide which then loses water to form poly ( 1,3,4 - oxadiazole ) . This reaction is analogous to the method discussed above , except that in the present case the polyhydrazide is generated in situ and not isolated . It is ...
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