Abstract
AMONG the heat-resistant polymers aromatic polyethers are of great interest. They are notable for their high thermal and chemical stability, good mechanical and dielectric properties and easy proccssability for the production of various manufactured articles [1, 2]. Aromatic polyethers prepared up to the present time by nucleophflic substitution have .comparatively low softening points [2]. By the example of a number of hetero-chain polymers (polyarylates, polyamides, polyoxadiazoles and polyimides) it has been shown that their resistance to high temperatures is increased considerably when the polymer molecule contains cyclic side groups, one of thc atoms of which also forms part of the main polymer chain [3-6]. In future we shall call polymers of this type cardic polymers or polycards (from the latin word cardo, meaning a loop), because such cyclic groupings can be regarded as loops in the main polymer chain. Groups of this type include phthalide, phthalimidine, fluorene, anthrone etc. groups.
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