@article{BrumaHamciucHamciucetal.1996, author = {Bruma, Maria and Hamciuc, Corneliu and Hamciuc, Elena and Mercer, Frank W. and Belomoina, Nataliya and Schulz, Burkhard}, title = {Heterocyclic polyamides containing hexafluoroisopropylidene groups}, year = {1996}, language = {en} } @article{BrumaHamciucSavaetal.1996, author = {Bruma, Maria and Hamciuc, Corneliu and Sava, Ion and Hamciuc, Elena and Mercer, Frank W. and Fritzsche, P. and Schulz, Burkhard}, title = {High temperature polyamides containing pendant imide groups}, year = {1996}, language = {en} } @article{HamciucSchulzBruma1996, author = {Hamciuc, Corneliu and Schulz, Burkhard and Bruma, Maria}, title = {New polyhydrazides and polyoxadiazoles containing pendent phenoxy groups}, year = {1996}, language = {en} } @article{HamciucHamciucBrumaetal.1997, author = {Hamciuc, Elena and Hamciuc, Corneliu and Bruma, Maria and Stoleriu, Andre and Schulz, Burkhard}, title = {Poly(hydrazide-ester)s and poly(1,3,4-oxadiazole-ester)s containing pendent phenoxy groups}, year = {1997}, abstract = {A series of new arornatic poly(hydrazide-ester)s has been synthesized by solution polycondensation of two diacid dichlorides containing preformed ester groups with phenoxyterephthaloyl dihydrazide or with a mixture of phenoxyterephthaloyl dihydrazide with terephthaloyl- or isophthaloyl dihydrazide in N-methyl-2-pyrrolidinone. The thermal cyclization of the poly(hydrazide-ester)s gave the corresponding poly(1,3,4-oxadiazole-ester)s containing pendent phenoxy groups. The polymers were characterized by viscometry, solubility measurements, IR spectroscopy, differential scanning calorimetry and thermogravimetric analysis.}, language = {en} } @article{BrumaHamciucHamciucetal.1997, author = {Bruma, Maria and Hamciuc, Corneliu and Hamciuc, Elena and Mercer, Frank W. and Belomoina, Nataliya and Schulz, Burkhard}, title = {Heterocyclic polyamides containing hexafluoroisopropylidene groups}, year = {1997}, abstract = {New heterocyclic polyamides have been synthesized by solution polycondensation of aromatic diamines containing phenyl- quinoxaline units with diacid chlorides having both imide and hexafluoroisopropylidene (6F) groups. These polymers are soluble in polar aprotic solvents, such as N-methylpyrrolidone (NMP) or N,N-dimethylformamide (DMF), and can be cast into flexible thin films from solutions. They show high thermooxidative stability with decomposition temperatures above 400°C and glass transition temperatures in the range of 225 - 300°C. The polymer films exhibit good chemical resistance towards deluted acids and good electrical insulating properties with dielectric constants in the range of 3.2 - 3.7.}, language = {en} }