| 摘要 |
High molecular weight thermotropic aromatic copolyesteramides which can be molded/extruded into a wide variety of useful shaped articles having improved thermomechanical properties are comprised of recurring structural units of the formulae (I), (III) and (IV), and optionally (II), wherein: (I) represents the structure: <IMAGE> in which R1 is a methyl or ethyl radical or a chlorine or bromine atom, with the proviso that the units (I) may be identical or different, (II) represents the structure: <IMAGE> (III) represents the structure: <IMAGE> in which n is an integer from 2 to 6, with the proviso that the units (III) may be identical or different, (IV) represents the structure: <IMAGE> the molar ratio of the units (I) relative to the sum of the units (II)+(III) ranges from 0.95 to 1.05; the amount of the units (II) in the mixture of (II)+(III) ranges from 0 to 80 mol % and that of the units (III), on the same basis, ranges from 100 to 20 mol %; the amount of the units (IV), expressed relative to the amount of the units (I) ranges from 5 to 100 mol %; and said copolyesteramides have a flow temperature ranging from 200 DEG C. to 350 DEG C.
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