منابع مشابه
Stress Overshoot of Polymer Solutions at High Rates of Shear
Overshoot of shear stress, s, and the first normal stress difference, N1, in shear flow were investigated for polystyrene solutions. The magnitudes of shear corresponding to these stresses, gsm and gNm, for entangled as well as nonentangled solutions were universal functions of ġteq, respectively, and gNm was approximately equal to 2gsm at any rate of shear, ġ. Here teq 5 tR for nonentangled sy...
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Most of the synthetic compounds are prepared and processed in the liquid state, i.e. in solution or in the molten state. Detailed knowledge on this state is therefore indispensable. In particular it is essential to know the limits of complete miscibility with a low molecular weight solvent as a function of temperature, pressure and composition. Furthermore it is often mandatory to be acquainted...
متن کاملTurbulence of polymer solutions.
We investigate high-Reynolds-number turbulence in dilute polymer solutions. We show the existence of a critical value of the Reynolds number, which separates two different regimes. In the first regime, below the transition, the influence of the polymer molecules on the flow is negligible, so they can be regarded as passively embedded in the flow. This case admits a detailed investigation of the...
متن کاملViscoelastic properties of polymer solutions.
In a concentrated polymer solution, the entanglement of long-chain molecules results in a transient network structure, to which may be attributed certain aspects of the viscoelastic behavior of such a system. A suitable mechanical model for representing this network as a first approximation is a retarded Maxwell element with one spring and two dashpots. Experimental measurements of mechanical p...
متن کاملSoft Confinement for Polymer Solutions
As a model of soft confinement for polymers, we investigated equilibrium shapes of a flexible vesicle that contains a phase-separating polymer solution. To simulate such a system, we combined the phase field theory (PFT) for the vesicle and the self-consistent field theory (SCFT) for the polymer solution. We observed a transition from a symmetric prolate shape of the vesicle to an asymmetric pe...
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ژورنال
عنوان ژورنال: Kobunshi Kagaku
سال: 1958
ISSN: 1884-8079,0023-2556
DOI: 10.1295/koron1944.15.719