C. Hamciuc, E. Hamciuc, M. Brumǎ
Jul 25, 2005
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0
Influential Citations
51
Citations
Journal
Polymer
Abstract
Abstract New fluorinated poly(1,3,4-oxadiazole-ether-imide)s have been prepared by solution polycondensation reaction of different aromatic diamines having preformed 1,3,4-oxadiazole ring, such as 2,5-bis( p -aminophenyl)-1,3,4-oxadiazole, 2,5-bis[ p -(4-aminophenoxy)phenyl]-1,3,4-oxadiazole, 2,5-bis[ p -(3-aminophenoxy)phenyl]-1,3,4-oxadiazole, 2-(4-dimethylaminophenyl)-5-(3,5-diaminophenyl)-1,3,4-oxadiazole and 2-(4-fluorophenyl)-5-(3,5-diaminophenyl)-1,3,4-oxadiazole, with an aromatic dianhydride incorporating ether linkages and hexafluoroisopropylidene group, namely 1,1,1,3,3,3-hexafluoro-2,2-bis-[(3,4-dicarboxyphenoxy)phenyl]-propane dianhydride. The polymers were easily soluble in polar organic solvents, such as N -methylpyrrolidinone, N , N -dimethylformamide, and pyridine, as well as in certain low boiling-point organic solvents, such as tetrahydrofuran and chloroform. Very thin coatings deposited onto silicon wafers exhibited smooth, pinhole-free surface in atomic force microscopy. The polymers showed high thermal stability with decomposition temperature being above 410 °C. They exhibited a glass transition in the temperature range of 183–217 °C, with reasonable interval between glass transition and decomposition temperature. Solutions of some polymers in N , N -dimethylformamide exhibited blue fluorescence, having maximum emission wavelength in the range of 411–424 nm.