The steady flow shear modulus of polymer melts

1966 ◽  
Vol 10 (1) ◽  
pp. 75-80 ◽  
Author(s):  
L. L. Blyler ◽  
T. W. Huseby
Keyword(s):  
Shear Modulus ◽  
Steady Flow ◽  
Polymer Melts ◽  
Flow Shear

The steady flow of closely fitting incompressible elastic spheres in a tube

1978 ◽  
Vol 87 (1) ◽  
pp. 1-16 ◽  
Author(s):  
Hüsnü Tözeren ◽  
Richard Skalak
Keyword(s):  
Shear Modulus ◽  
Steady Flow ◽  
Elastic Material ◽  
Displacement Field ◽  
Series Solution ◽  
Cylindrical Tube ◽  
Lubrication Theory ◽  
Flow Properties ◽  
Circular Cylindrical Tube ◽  
Neutrally Buoyant

The steady flow of a suspension of closely fitting, neutrally buoyant, incompressible and elastic spheres through a circular cylindrical tube is investigated under the assumption that lubrication theory is valid in the fluid region. A series solution giving the displacement field of an elastic incompressible sphere under axisymmetrically distributed surface tractions is developed. It is found that, for closely fitting particles, flow properties of the suspension are strongly dependent on the shear modulus of the elastic material and the velocity of the particle.

Steady Flow and Dynamic Oscillatory Experiments on Polymer Melts

1967 ◽  
Vol 11 (1) ◽  
pp. 77-94 ◽  
Author(s):  
T. W. Huseby ◽  
L. L. Blyler
Keyword(s):  
Steady Flow ◽  
Polymer Melts

Viscoelastic relaxation in a series of polyethylacrylates and poly- n -butylacrylates

1969 ◽  
Vol 309 (1499) ◽  
pp. 497-520 ◽  
Keyword(s):  
Molecular Weight ◽  
Shear Modulus ◽  
Relaxation Process ◽  
Steady Flow ◽  
High Frequency ◽  
Relaxation Processes ◽  
Flexible Polymer ◽  
Complete Relaxation ◽  
Frequency Relaxation ◽  
Flexible Polymer Chain

The viscoelastic properties of a series of four polyethylacrylates and of four poly- n -butylacrylates have been measured in alternating shear. All measurements were made above the glass transition temperature over the temperature range - 40 to 148 °C and at frequencies of 64 kHz, 15 MHz and 30 MHz. The steady-flow viscosity of each polymer follows a dependence upon temperature according to the equation log 10 ƞ = A + B /( T - T 0 ). The limiting high frequency elastic compliance, J ∞ , is found to be sensibly independent of molecular weight for each series of polymers and varies linearly with temperature. The results obtained are interpreted in terms of additive contributions to the complex shear modulus, G *, comprising: (1) a relaxation process at relatively high frequencies which follows the same form as that observed previously in supercooled non-polymeric liquids according to the model of Barlow, Erginsav & Lamb (1967 b ). (2) a limited summation of relaxation processes at lower frequencies arising from the modes of motion of the flexible polymer chain according to the extension of the Rouse (1953) theory made by Barlow, Harrison & Lamb (1964) for an undiluted polymer having a 'most probable’ distribution of molecular weight. For the polymers investigated the polymer modes (2) contribute a major part of the steady-flow viscosity while the high frequency relaxation process (1) is mainly responsible for the limiting high frequency shear modulus. Agreement is found between experimental results, covering a significant portion of the complete relaxation region, and the calculated behaviour based upon the sum of the above two separate relaxation processes.

scholarly journals Creep Measurements Confirm Steady Flow after Stress Maximum in Extension of Branched Polymer Melts

2013 ◽  
Vol 110 (16) ◽  
Author(s):  
Nicolas J. Alvarez ◽  
José Manuel Román Marín ◽  
Qian Huang ◽  
Michael Locht Michelsen ◽  
Ole Hassager
Keyword(s):  
Steady Flow ◽  
Polymer Melts ◽  
Branched Polymer ◽  
Stress Maximum ◽  
Creep Measurements

500 An in vitro steady flow model of mitral regurgitation by three-dimensional Doppler

1999 ◽  
Vol 1 ◽  
pp. S86-S86
Author(s):  
R DESIMONE ◽  
G GLOMBITZA ◽  
C VAHL ◽  
H MEINZER ◽  
S HAGL
Keyword(s):  
Mitral Regurgitation ◽  
Steady Flow ◽  
Flow Model ◽  
Three Dimensional
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