New results and the frontier problems of the rheology of aromatic copolyesters in the liquid crystalline melts are reviewed. It is demonstrated that the copolyester liquid crystalline melts possess a lot of chararteristic rheological behaviour: exhibiting yield stress
lower viscosity
negative primary normal-stress difference
extra date contraction and longer relaxation time which markedly depend on shear rate (oscillatory frequency)
temperature
time and thermal history.
关键词
共聚酯液晶熔体稳态流变学动态流变学瞬态流变学相变流变学
Keywords
Copolyester liquid crystalline meltsteady state rheologydynamic rheologytransient rheologyrheology of phase transition