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31.
S. O. Ilyin V. M. Spiridonova V. S. Savelyeva M. M. Ovchinnikov S. D. Khizhnyak E. I. Frenkin P. M. Pakhomov A. Ya. Malkin 《Colloid Journal》2011,73(5):646-650
Gelation in dilute aqueous L-cysteine solutions containing various electrolytes is studied by rotational viscometry in different
dynamic regimes. It is revealed that gels are formed at rather low concentrations of cysteine of no higher than 0.1 vol %.
In the linear range of mechanical actions, gels of all examined compositions behave as elastic solid-like media; their elastic
moduli, which lie in a range of 10–100 Pa, are independent of frequency and their mechanical losses are low. However, these
gels exhibit dualistic properties and can flow at low shear stresses with a Newtonian viscosity on the order of 103–105 Pa s. On reaching a critical stress (yield point), gels are destroyed, their viscosity decreases by six to seven decimal
orders of magnitude, and they are transformed into low-viscosity liquids. At rest, the initial structure and properties are
recovered. Mechanisms of percolation network formation are proposed. 相似文献
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A. Ya. Malkin V. V. Goncharenko V. V. Malinovskii 《Mechanics of Composite Materials》1976,12(3):439-444
The determination of the swell factor of a polymer jet extruded from a cylindrical or flat die is examined. Relations are obtained for the dependence of the swell factor on shear rate and shear stress, expressed in terms of the constants of the rheological model.Scientific Research Institute of Plastics, Moscow. Kiev Polytechnic Institute. Translated from Mekhanika Polimerov, No. 3, pp. 487–492, May–June, 1976. 相似文献
36.
V. E. Dreval' G. O. Botvinnik A. Ya. Malkin A. A. Tager 《Mechanics of Composite Materials》1972,8(6):978-984
Using solutions of various polymers in a large number of solvents as an example, the possibility of constructing a generalized characteristic for their viscosity, which is invariant relative to the molecular weight of the polymer and the nature of the solvent, is indicated. It is shown that the parameters characterizing the properties of individual macromolecular chains are the dimensions of the coils [], and the rheological effectiveness of interaction of the segments KM retain their importance and quantities determining the viscous properties of the polymer solution over the whole range of compositions. A connection is established between the datum parameter KM and the thermodynamic properties of dilute solutions of polymers, the flexibility of the polymer chain, and the energy of its intermolecular interaction.A. M. Gor'kii, Ural State University, Sverdlovsk. A. V. Topchiev Institute of Petrochemical Synthesis, Academy of Sciences of the USSR, Moscow. Translated from Mekhanika Polimerov, No. 6, pp. 1110–1117, November–December, 1972. 相似文献
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S. P. Papkov V. G. Kulichikhin V. D. Kalmykova A. Ya Malkin 《Journal of Polymer Science.Polymer Physics》1974,12(9):1753-1770
A study has been made of the viscous properties of poly(para-benzamide) (PBA) solutions in dimethyl acetamide, which undergo a transition from an isotopic to an anisotropic (liquid-crystal) state at a definite concentration C*. The polymer solutions behave in many respects (as regards the concentration and temperature dependence of viscosity, etc.) like solutions of low molecular weight compounds forming a liquid crystal phase, although the transitions are less pronounced in the polymer solutions owing to their polydispersity. It is shown that the viscometric method, being extremely sensitive to C*, is convenient for determining phase diagrams of anisotropic polymer solutions. The values of C* as related to the molecular weight of PBA have been determined, and a general criterion for transition from isotropic to anisotropic solutions established; the latter has the form (CM?)* ≈ 1.3 × 105 at 20°C. This criterion is in line with the condition for the formation of the liquid-crystal structure in a dispersion of rodlike particles as proposed by Flory. Generalized concentration dependences of viscosity have been plotted by reducing concentration to C* and viscosity, to the maximum viscosity at the phase transition point. In investigating the flow properties of PBA solutions we revealed the existence of a yield point in the range of low shear stresses, and an intersection of the flow curves of solutions of different concentration at high shear stresses, which excludes a generalized representation of the flow curves in reduced ordinary-type coordinates. 相似文献
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