On the possibility of estimating weak interactions of macromolecules in solutions from the experimental viscous flow activation energies data

1980 ◽  
Vol 2 (9) ◽  
Author(s):  
E.P. Varfolomeeva ◽  
V.Ya. Grinberg ◽  
V.B. Tolstogusov
Keyword(s):  
Viscous Flow ◽  
Weak Interactions ◽  
Activation Energies ◽  
Flow Activation

Effects of viscous flow activation energies and viscosities on waterborne light-diffusion dip-coatings

2019 ◽  
Vol 48 (5) ◽  
pp. 415-420
Author(s):  
Tian Fang ◽  
Daiyong Ye
Keyword(s):  
Shear Rate ◽  
Viscous Flow ◽  
Activation Energies ◽  
Rotational Viscometer ◽  
Acrylic Emulsion ◽  
Environment Friendly ◽  
Content Type ◽  
Shear Rates ◽  
Flow Activation ◽  
Light Diffusion

Purpose This paper aims to prepare good waterborne light-diffusion dip-coatings (WLDDC) for the glass lampshade inner walls of LED lamp tubes, the effects of viscosities and viscous flow activation energies on these dip-coatings were investigated. Design/methodology/approach The WLDDC were prepared using white pigments, light-diffusion agents, additives and an acrylic emulsion. The dip-coatings were characterized by Fourier transform infrared spectroscopy, scanning electron microscopy and a digital rotational viscometer, respectively. The effects of shear rates, temperatures and solids contents on the viscosities of the dip-coatings were studied. The viscous flow activation energies of these dip-coatings and the emulsion were calculated, compared and studied, respectively. Findings The results showed that the non-Newtonian behaviors of these dip-coatings were more prominent than that of the acrylic emulsion. When the temperature was maintained to be a constant and the shear rate was increased, the viscosity decreased and the shear stress increased. When the shear rate was maintained to be a constant, the viscosity decreased with increasing temperatures. The viscous flow activation energies of these dip-coatings decreased with the increasing shear rates. The higher solid contents of WLDDC were, the more its viscosity would decrease with the increasing shear rates, the more prominent its non-Newtonian behaviors would show. Practical implications A sample of good WLDDC with balanced properties was illustrated. Originality/value This investigation benefits to investigate waterborne environment-friendly dip-coatings for the inner glass walls of lamp tubes. This research provides an approach to optimize the viscosity parameters of light-diffusion dip-coatings.

Surface diffusion and flow activation energies of perfluoropolyalkylether

1995 ◽  
Vol 1 (2-3) ◽  
Author(s):  
TeresaM. O'Connor ◽  
MyungS. Jhon ◽  
CharlesL. Bauer ◽  
ByungG. Min ◽  
DoY. Yoon ◽  
...  
Keyword(s):  
Surface Diffusion ◽  
Activation Energies ◽  
Flow Activation

Anomalous Flow of Polyisobutylene

1967 ◽  
Vol 40 (5) ◽  
pp. 1492-1504
Author(s):  
J. Kenneth Lund
Keyword(s):  
Polymer Melt ◽  
Activation Energies ◽  
The Other ◽  
Rotating Flow ◽  
Viscosity Data ◽  
Flow Units ◽  
Uniform Shear ◽  
Shear Degradation ◽  
New Type ◽  
Flow Activation

Abstract This work began as a study of shear degradation in a polymer melt subjected to a uniform shear field. A new type of biconical rotor rheometer was designed and constructed for it. Early in the investigation, however, phenomena were observed which led our efforts away from the original objectives. Viscosity data on a polyisobutylene melt have been obtained which indicate the presence of two flow regions, having significantly different flow activation energies. Normal entanglement flow is encountered in one, the other is apparently dominated by a different mechanism, which results in lower flow activation energies. A mechanism involving rotating flow units is proposed and applied to describe this region.

Viscosities and Activation Energies of Viscous Flow of the 1,2-Ethanediol/N,N-Dimethylformamide Binary Solvent System

1992 ◽  
Vol 65 (2) ◽  
pp. 503-511 ◽  
Author(s):  
Fulvio Corradini ◽  
Luigi Marcheselli ◽  
Andrea Marchetti ◽  
Mara Tagliazucchi ◽  
Lorenzo Tassi ◽  
...  
Keyword(s):  
Viscous Flow ◽  
Solvent System ◽  
Activation Energies ◽  
Binary Solvent
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