Conformational and Configurational Characteristics of 3,4'-Dihydroxybenzophenone Terephthalate

Publisher Website
Google Scholar
Abstract
This paper describes the structure, and properties of a thermotropic fully aromatic polyester that exists in a helical conformation in the solid state and an extended conformation in the nematic phase. The polymer is prepared from 3,4'dihydroxybenzophenone (34'PC0PG) and terephthalic acid (T). The polymer can be highly crystalline and has a K-N transition at 285°C and a sharp N-I transition at 360°C. The unique properties of 34'PC0PG-T result from the asymmetry and flexibility of the 34'PC0PG moiety. Because it is asymmetric, the diol can be incorporated into the polymer chain randomly, head-to-tail or head-to-head. The flexiblity of the unit gives the diol the ability to adopt either a bent or extended conformation. In the solid state two crystal structures having extended conformations are found.