Mesomorphic phase transition and molecular motion of polyesters having 1,2bis (phenoxy) ethane-4.4'-dicarboxylate

Abstract

In this work, we have investigated phase transitions and molecular motions of poly [ethylene 1,2-bis (phenoxy) ethane-4,4'-dicarboxylate] (PEG/EG) and poly [ethylene 1,2-bis (2-chlorophenoxy) ethane-4,4'-dicarboxylate] (Cl-PEC/EG). In both PEG/EG and Cl-PEC/EG, any mesophase was not observed. Refering to our previous results on other polyesters having PEC, it was deduced that an introduction of rigid phenyl groups to PEC instead of flexible EG needs an appearance of mesophase in PEC-polyesters. It is found that the substitution of Cl to the phenyl group in PEC make the backbone chains of PEC-polyester more rigid.