Abstract
SynopsisPhenolic acids existing abundantly in the plant cell wall and also produced easily by enzymatic reaction of aromatic amino acid were polymerized to create liquid-crystalline aromatic biopolyesters. Especially, the use of AB2-type multifunctional monomers gave hyperbranched polyesters. Oriented films prepared by stretching the polyesters under the elevated temperature showed a high thermo-mechanical performance comparable with those of general engineering plastics.The annealing of the polyesters increased their softening temperature to be over 300oC. The polyester resin was expected to apply to the heat-resistance biomaterials usable around automobile engines.
