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Autori: Mariana Dana Iosip, Maria Bruma, Jenifer Robison, Yvette Kaminorz, Burkhard Schulz
Editorial: High Performance Polymers, 2001.
Two series of related poly(oxadiazole-amide)s have been synthesized by solution polycondensation reaction of aromatic diamines containing preformed 1,3,4-oxadiazole rings with diacid chlorides having silicon or hexafluoroisopropylidene groups. All these polymers were soluble in polar amidic solvents, such as N-methylpyrrolidinone and dimethylformamide and gave thin transparent free-standing films on casting their solutions. The polymers exhibited high thermal stability, with the initial decomposition temperature being above 400C. Most of these polymers did show a glass transition, being in the temperature range of 238-275C. Very thin coatings, in the range of tens of nanometer, which were deposited onto silicon wafers exhibited smooth and pinhole-free surfaces in atomic force microscopy investigations. The study of phtoluminescence properties revealed that some of these compounds emit blue light, in the range of 440-475 nm. All these characteristics are discussed and compared with those of conventional aromatic poly(1,3,4-oxadiazole)s.
Cuvinte cheie: poly (1,3,4-oxadiazole), silicon, hexafluoroizopropiliden, thin films, fluorescence, thermostability