| A new biodegradable copolymers: poly(butylene sebacate-co-butylene dilinoleate) modified by different (0 - 10 wt.%) content of buthylene terephtalate were synthesized and their thermal and dielectric properties were investigated in a wide temperature range. There was find that melting temperature Tm decreases from 338 to 316K and glass temperature increases from 206.5 to 216.5K with the increase of the buthylene terephtalate content. Two dielectric relaxations: α at about 250K and β near 200K were observed in dielectric spectra; also melting process is explicitly seen there in a form of rapid increasing of dielectric constant value. Good coincidence between values of melting temperatures estimated by DSC and dielectric measurements was observed. A reason of such a behaviour is disscused with respect to degree of crystallinity changes caused by buthylene terephtalate presence in the copolymer. |
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