Effects of orientation on the properties of liquid crystalline polymers

Abstract Mechanical properties and thermal behavior of liquid crystalline polymers with mesogene groups in the main chain were studied as functions of jet draw ratio. It is shown that tensile strength F and Young's modulus E increase with draw ratio and the maximum E depends mainly on the chemical structure of chain and F is strongly affected by molecular packing that may be improved by heat treatment. The differential thermal analysis, thermal mechanical analysis and thermal acoustic analysis were used to find the spinning conditions for achieving maximum orientation and annealing conditions for macromolecular reconstructions without disorientation.