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Materiale Plastice (Mater. Plast.), Year 2006, Volume 43, Issue 2,





Poly-1,3,4,-oxadiazole -ethers Thin Films.


Abstract:
Thin films, in the range of tens of micrometers thickness, have been prepared by casting onto glass plates the chloroform or N-methylpyrrolidone solutions of poly(1,3,4-oxadiazole-ether)s. The polymers have been prepared by nucleophyilic substitution polymerization technique of 2,5-bis(p-fluorophenyl)-1,3,4-oxadiazole with various aromatic bisphenols, such as 4,4’-isopropylidenediphenol, 4,4’-(1,4-phenylene-diisopropylidene)bisphenol or 4,4’-(hexafluoroiso-propylidene)diphenol. They showed high thermal stability with decomposition temperature above 410°C and glass transition temperature in the range of 187-211°C. The polymer films exhibited good mechanical properties with tensile strengths in the range of 36.92- 44.50 MPa, tensile modulus in the range of 1.42-1.74 GPa and elongation at break in the range of 3-91%. Electrical insulating properties of polymer films were evaluated on the basis of dielectric constant. The values of the dielectric constant at 10 kHz were in the range of 2.98-3.18. Keywords: poly(1,3,4-oxadiazole-ether)s, thin films, mechanical properties, dielectric constant



Issue: 2006 Volume 43, Issue 2
Pages:
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