CIS-TRANS-ISOMERIZATION OF POLYESTERS BASED ON 1,4-CYCLOHEXANEDICARBOXYLIC ACID IN THE LIQUID-CRYSTALLINE AND ISOTROPIC STATES

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TENKOVTSEV, AV
RUTMAN, AB
BILIBIN, AY
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O63 [高分子化学(高聚物)];
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070305 ; 080501 ; 081704 ;
摘要
Polyesters based on 4,4'-(cis-1,4-cyclohexanedicarbonyldioxy)dibenzoic acid and resorcinol or chlorohydroquinone were synthesized. The rate constants of the cis/trans isomerization reaction in the liquid-crystalline and isotropic states were measured. A liquid-crystalline environment is shown to enhance the rate of isomerization, but the chain rigidity determines the cis/trans equilibrium ratio of 1,4-cyclohexanedicarboxylic acid moieties.
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页码:687 / 692
页数:6
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