| 摘要 |
<p>Poly(ester carbonate) formed by the condensation of an aromatic dihydric alcohol, phosgene and an aromatic or cycloaliphatic dicarboxylic acid or acid halide with at least about 25 mole percent of the dihydric alcohol being a tricyclic aromatic bisphenol, linked in a para-fashion, with all four sites ortho to the phenolic hydroxyl groups being substituted with bromine, chlorine or alkyl of 1-6 carbons. Such poly(ester carbonates) have higher glass transition temperatures than poly(ester carbonates) prepared with unsubstituted bicyclic bisphenols only, while retaining a desirable combination of tensile properties and ductility.</p> |
