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- W2032187777 abstract "The theoretical framework of Doi and Marrucci for predicting the rheological properties of polymeric liquid crystals is considered in some detail. Previous limitations of the analysis, which restricted the theory to asymptotically low deformation rates, have been removed. The resulting predictions were compared with experimental data using both shearing and extensional flow configurations; for the latter a new fiber spinning apparatus was constructed with an order‐of‐magnitude increase in sensitivity over that of the best previously reported extensional devices. The agreement between theoretical prediction and experimental result is excellent for steady state deformations over the full range of conditions studied for both extensional and shearing modes of deformation; this is especially remarkable in view of the fact that all rheological properties are given by equations which contain only two experimentally adjustable parameters. However, this excellent agreement between theory and experiment does not appear to extend to transient behavior, nor is it expected at very high deformation rates. At solution concentrations just beyond that of the isotropic‐anisotropic transition, the viscosity decreases with increasing polymer concentration. These fluids are of surprisingly low viscosity; in steady shear the power law index or slope of the shearing stress—shear rate curve decreases progressively as the shear rate increases over the range studied. The first normal stress difference is linear in shear rate, at low shear rates, and is predicted to saturate at high shear rates. The first normal stress difference is larger than the shearing stress at a given shear rate, yet the fluids are so inelastic that they exhibit a die swell which is less than that of a Newtonian fluid. The Trouton ratio (ratio of the extensional to shearing viscosities) does not appear to be equal to three at low deformation rates as it is for all other fluids, and the fluid is predicted to become extension‐thinning at high deformation rates. Polymeric liquid crystals are thus observed to be a class of materials rheologically distinct from Newtonian fluids and from solutions or melts of flexible polymer molecules." @default.
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- W2032187777 date "1986-06-01" @default.
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- W2032187777 title "Rheological Properties of Polymeric Liquid Crystals" @default.
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