Abstract
Rheological properties of a thermotropic liquid‐crystalline copolyester which was synthesized from poly(ethylene terephthalate) and 60 mol % p‐hydroxybenzoic acid were investigated. The dynamic and steady flow properties above the rheological transition temperature (∼270 °C) were studied in detail. It has been found that the steady flow properties are not affected by thermal history in the anisotropic state. The following relations hold between steady flow and dynamic viscoelastic properties of the sample with a shearing history: ‖η*(ω)‖=η(γ) at ω=γ, and limω→0 G’(ω) = 1/5 limτ→0 N1(γ) . In the anisotropic state, the thermotropic liquid‐crystalline copolyester shows a significant shear‐thinning of viscosity even at very low shear rates and a first normal stress difference comparable with an isotropic copolyester melt which was synthesized from poly(ethylene terephthalate) and 28 mol % p‐hydroxybenzoic acid. The steady compliance (Js) of the liquid‐crystalline copolyester in the anisotropic state is abo...
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