Rheologica Acta

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Molecular orientation in sheared molten thermotropic random copolyester
Rheologica Acta - Tập 46 - Trang 1139-1152 - 2007
Angel Romo-Uribe
The macromolecular alignment and texture orientation in sheared thermotropic copolyester were investigated using in situ wide-angle X-ray scattering (WAXS) and polarizing optical microscopy (POM). The molecular behavior was correlated with viscoelastic properties. The polymer is a random copolyester based on 60 mol% 1,4-hydroxybenzoic acid (B) and 40 mol% ethylene terephthalate (ET) units. X-ray s...... hiện toàn bộ
Frequency dispersion of strain-induced crystallization coefficient of natural rubber vulcanizates in sub-sonic range
Rheologica Acta - - 1974
Hiroaki Hiratsuka, Mitsuaki Hashiyama, Seisuke Tomita, Hiromichi Kawai
Die Viskosität niedermolekularer, unpolarer Flüssigkeiten in Abhängigkeit von Temperatur, Druck und Konzentration
Rheologica Acta - Tập 2 - Trang 164-174 - 1962
M. Hoffmann, K. Rother
Flüssigkeiten mit unpolaren oder schwachpolaren Molekülen folgen gewöhnlich gleichzeitig der Gleichung vonTammann für die Temperaturabhängigkeit und der Gleichung vonArrhenius für die Konzentrationsabhängigkeit ihrer Viskosität. Hieraus ergibt sich eine bestimmte Konzentrationsabhängigkeit der Konstanten der Temperaturgleichung und damit auch eine Beziehung für die Viskositätszahl als Funktion der...... hiện toàn bộ
A note on streaming double refraction in a dilute suspension of rigid spheroids subject to weak Brownian rotations
Rheologica Acta - Tập 11 Số 2 - Trang 190-198 - 1972
Leal, L. G., Hinch, E. J.
The phenomenon of streaming double refraction is examined theoretically for simple shear flow of a dilute suspension of rigid spheroids which are subject to weak Brownian rotations. In particular, we employ recently derived expressions for the statistical distribution of particle orientations in the limit of weak rotaryBrown-ian motion to calculate the corresponding limiting behavior of the extinc...... hiện toàn bộ
Rheology of concentrated disperse systems III. General features of the proposed non-newtonian model. Comparison with experimental data
Rheologica Acta - Tập 17 - Trang 643-653 - 1978
D. Quemada
A non-newtonian viscosity equation $$\eta _r = (1 - \tfrac{1}{2} \cdot \tilde k\phi )^{ - 2} $$ whereφ is the volume concentration and $$\tilde k = (k_0 + k_\infty \dot \gamma _r^p )/(1 + \dot \gamma _r^p )$$ ...... hiện toàn bộ
Application of melt flow index for rheological characterization of branched and linear polymers
Rheologica Acta - Tập 25 - Trang 195-198 - 1986
Z. Dobkowski
A procedure for evaluating rheological characteristics, such as the master curves logη/η 0 vs. log % MathType!MTEF!2!1!+-% feaafiart1ev1aaatCvAUfeBSjuyZL2yd9gzLbvyNv2CaerbuLwBLn% hiov2DGi1BTfMBaeXatLxBI9gBaerbd9wDYLwzYbItLDharqqtubsr% 4rNCHbGeaGqiVu0Je9sqqrpepC0xbbL8F4rqqrFfpeea0xd9Gqpe0x% c9q8qqaqFn0dXdir-xcvk9pIe9q8qqaq-xir-f0-yqaqVeLsFr0-vr% 0-vr0db8meaabaqac...... hiện toàn bộ
Suspensions of monodisperse spheres in polymer melts: particle size effects in extensional flow
Rheologica Acta - Tập 42 Số 1-2 - Trang 184-190 - 2003
Jean‐François Le Meins, Paula Moldenaers, Jan Mewis
Van Gurp-Palmen Plot II – classification of long chain branched polymers by their topology
Rheologica Acta - Tập 41 - Trang 103-113 - 2002
Stefan Trinkle, Philipp Walter, Christian Friedrich
Rheological data on monodisperse model-type polymers with a certain topology are available in the literature. A comparison between these series has not been made yet, mainly because the different chemical nature of these polymers inhibited a direct comparison. With the so-called reduced van-Gurp-Palmen plot (rvGP) this task has become possible and this article applies this plot to these model-typ...... hiện toàn bộ
Some aspects of linear and nonlinear viscoelastic behaviour of polymer melts in shear
Rheologica Acta - Tập 21 Số 4 - Trang 376-387 - 1982
Booij, H. C., Palmen, J. H. M.
In linear viscoelastic investigations the frequency dependence of the phase shift between stress and strain appears to be very characteristic of the molecular structure of the material. This function is also a good approximation of the slope of the double logarithmic plot of the absolute value of the shear modulusG d vs. the angular frequencyω. The product (G d /π) sin 2δ comes very close to the r...... hiện toàn bộ
Frequency response analysis of the Bautista-Manero-Puig model with normal stress: analytical and numerical solution for large amplitudes
Rheologica Acta - - Trang 1-22 - 2024
E. Hernandez, F. Bautista, J. P. García-Sandoval, O. Manero
We derive explicit analytical expressions for the recurrence relations using the analytical matrix method for frequency response and the Bautista-Manero-Puig model for complex fluids. The BMP model is derived from the Extended Irreversible Thermodynamics formalism and has been shown to be useful in predicting the complex rheological behavior of self-associative systems. All harmonics of the altern...... hiện toàn bộ
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