Application of the rising-column capillary viscometer to the high-viscosity range

Stow, F. S.; Horowitz, K. H.; Elliott, John H.

doi:10.1016/0095-8522(49)90013-6

Cited by 12 publications

(1 citation statement)

References 2 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…At present, the upper limit of the viscosity of commercially available viscosity standard liquids is 10 3 Pa0s, because the rapid measurement of viscosities higher than that value is difficult. [3][4][5] The accurate measurement of the viscosity is of course important also for the wide field of ultrasonic spectroscopic study on the soft materials. [6][7][8][9][10][11] We developed a new type of a viscometer using the electro-magnetically spinning (EMS) method, [12][13][14][15][16][17][18][19] which is already commercially available as an industrial apparatus.…”

mentioning

confidence: 99%

Rapid measurement of ultrahigh viscosity using an electro-magnetically spinning system

Yasuda

Nami

Hara

et al. 2014

Jpn. J. Appl. Phys.

View full text Add to dashboard Cite

The electro-magnetically spinning (EMS) viscometer we recently developed enables non-contact viscosity measurement. The measurement sample is confined in an isolated sample cell, and the viscosity, which is one of the most important mechanical parameters to determine ultrasonic propagation in fluids, is easily obtained in a few minutes for lower-viscosity liquids. In this paper, we report an improved system for the measurement of highly viscous liquids: laser light is incident on a probe metal sphere, and the speckle pattern generated by the scattered light is observed using detectors aligned along a circle around the center of the speckle rotation. We successfully measured a viscosity of 103 Pa·s within only 0.1 s, demonstrating the system’s ability to measure rapid changes of viscosity, for example, in a material undergoing the glass transition.

show abstract

mentioning

confidence: 99%

Rapid measurement of ultrahigh viscosity using an electro-magnetically spinning system

Yasuda

Nami

Hara

et al. 2014

Jpn. J. Appl. Phys.

View full text Add to dashboard Cite

show abstract

Some relationships between molecular structure and flow in linear polyethylene

Schreiber¹

1965

J of Applied Polymer Sci

View full text Add to dashboard Cite

synopsisThe flow curves of linear polyethylenes are characterized by a set of empirically defined parameters, including the apparent melt viscosity at zero shear stress, the shear streas for onset of non-Newtonian flow, and the s l o p of linear sections fitted to data in three shear stress ranges of the flow curve. Not all of these parameters have theoretical significance but all are easily meagured and therefore should be useful for broad, practical application. The dependence of the parameters on molecular weight, shape, and breadth of the molecular weight distribution has been demonstrated by using fractions and blends of fractions of linear polyethylenes. The zero shear viscosity and degree of non-Newtonian flow at low shear stress depend primarily on polymer molecular weight. The degree of non-Neenian flow a t higher shear stress can be related quantitatively to molecular weight distribution factors, while the stress for onset of non-Newtonian flow also correlates with molecular weight distribution. Formally, the derived correlations are specific to the apparatus used, but may in fact have much broader validity because of the minor importance in these polymer samples, of elastic effects such as capillary die entry effects.

show abstract

Rheology of polyisobutylene. II. Low molecular weight polymers

1954

View full text Add to dashboard Cite

The flow and retarded‐elastic behavior of four polyisobutylene specimens (M̄w 1.09 × 104 to 8.54 × 104), measured in a concentric cylinder rotational viscometer, are reported. Under the conditions investigated the non‐Newtonian flow behavior can be represented by Ferry's equation. The logarithm of the viscosity η varied linearly with the reciprocal of the square of the absolute temperature. The time‐scale for retarded elasticity was found to vary with temperature in the same way as the viscosity. The normalized retarded elasticity functions at temperatures corresponding to unit viscosity are substantially identical. The time corresponding to a normalized retarded elastic compliance of 0.5 is about 10−5 η second when η is in poises. The reciprocal steady state shear compliances 1/J and internal shear moduli Gi in Ferry's equation are of the same order of magnitude for each polymer. The retardation time function L(ln τ) is calculated for one of the polymers, and then the dynamic response; these results are in good agreement with dynamic measurements on this material. From a consideration of the stress relaxation behavior of high molecular polymers, it is pointed out that there must exist another retarded elasticity mechanism, the time‐scale of which depends only on temperature and not on molecular weight. This second mechanism is masked in the reported experiments on low molecular polymers.

show abstract

Application of the rising-column capillary viscometer to the high-viscosity range

Cited by 12 publications

References 2 publications

Rapid measurement of ultrahigh viscosity using an electro-magnetically spinning system

Rapid measurement of ultrahigh viscosity using an electro-magnetically spinning system

Some relationships between molecular structure and flow in linear polyethylene

Rheology of polyisobutylene. II. Low molecular weight polymers

Contact Info

Product

Resources

About