THERMOTLERANT SYNTHETIC LEAF OBTAINING PR0CESS

The process comprises treatment of polyamic acid structure polymer soln. obtd. through polycondensation of dianhydride with 4,4'-diamino diphenyl ether with or without 4,4'-diamino diphenyl methane, in a bipolar amidic solvent. The solution is deposited in successive thin layers on silicon...

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Bibliographische Detailangaben
Hauptverfasser:	CIOFU VALERIAN, RO, ADUMITRESEI CONSTANTIN, SAVA ION, HAMCIUC CORNELIU, BRUMA MARIA
Format:	Patent
Sprache:	eng ; rum
Schlagworte:	AFTER-TREATMENT NOT COVERED BY SUBCLASSES C08B, C08C, C08F,C08G CHEMISTRY COMPOSITIONS BASED THEREON GENERAL PROCESSES OF COMPOUNDING MACROMOLECULAR COMPOUNDS OBTAINED OTHERWISE THAN BY REACTIONSONLY INVOLVING UNSATURATED CARBON-TO-CARBON BONDS METALLURGY ORGANIC MACROMOLECULAR COMPOUNDS THEIR PREPARATION OR CHEMICAL WORKING-UP WORKING-UP
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Beschreibung
Zusammenfassung:	The process comprises treatment of polyamic acid structure polymer soln. obtd. through polycondensation of dianhydride with 4,4'-diamino diphenyl ether with or without 4,4'-diamino diphenyl methane, in a bipolar amidic solvent. The solution is deposited in successive thin layers on siliconised cellulose paper anti-adherent support. This is followed by drying and high temperature treatment. The polyimidic sheet is electrically insulating, and its onset of thermal oxidation degradation is 440-450 deg C.