Copoly(1,3,4-oxadiazole-ether)s containing phthalide groups and thin films made therefrom

摘要: Abstract A series of aromatic copolyethers containing 1,3,4-oxadiazole rings and phthalide groups was prepared by nucleophilic substitution polymerization technique phenolphthalein, 1, or an equimolecular amount 1 different bisphenols 2, such as: 4,4′-isopropylidenediphenol, 4,4′-(hexafluoroisopropylidene)diphenol, 4,4′-(1,4-phenylene-diisopropylidene)bisphenol, 4,4′-cyclohexylidene-bisphenol 2,7-dihydroxynaphthalene, with 2,5-bis(p-fluorophenyl)-1,3,4-oxadiazole, 3. The polymers were easily soluble in polar solvents as N-methylpyrrolidone, N,N-dimethylacetamide, N,N-dimethylformamide chloroform can be cast from solutions into thin flexible films. They showed high thermal stability, decomposition temperature being above 400 °C. exhibited a glass transition the range 220–271 °C, reasonable interval between temperature. Electrical insulating properties some polymer films evaluated on basis dielectric constant loss their variation frequency values at 10 kHz 20 °C 2.98–3.15.