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Related Concept Videos

Surface Tension, Capillary Action, and Viscosity02:57

Surface Tension, Capillary Action, and Viscosity

Surface Tension
The various IMFs between identical molecules of a substance are examples of cohesive forces. The molecules within a liquid are surrounded by other molecules and are attracted equally in all directions by the cohesive forces within the liquid. However, the molecules on the surface of a liquid are attracted only by about one-half as many molecules. Because of the unbalanced molecular attractions on the surface molecules, liquids contract to form a shape that minimizes the number...
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Viscosity

When water is poured into a glass, it falls freely and quickly, whereas if honey or maple syrup is poured over a pancake, it flows slowly and sticks to the surface of the container. This difference in the flow of different kinds of liquids arises due to the fluid friction between the liquid layers and the liquid and the surrounding material. This property of fluids is called fluid viscosity. In this example, water has a lower viscosity than honey and maple syrup.
The SI unit of viscosity is...
Polymer Classification: Crystallinity01:21

Polymer Classification: Crystallinity

Unlike ionic or small covalent molecules, polymers do not form crystalline solids due to the diffusion limitations of their long-chain structures. However, polymers contain microscopic crystalline domains separated by amorphous domains.
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Viscosity01:27

Viscosity

Viscosity is a property of fluids that measures their resistance to flow. It is influenced by factors such as the surface area of contact, the gradient of flow speed, and the fluid's viscosity constant, called the coefficient of viscosity. The coefficient of viscosity, also known as dynamic viscosity, is denoted by the symbol η. It determines the proportionality between the viscous force and the gradient of flow speed.Newton's law of viscosity states that the viscous force on a faster-moving...
Viscosity of Fluid01:19

Viscosity of Fluid

Viscosity measures the resistance a fluid offers to flow and deformation. It results from internal friction between layers of fluid moving relative to one another. Dynamic viscosity, denoted by the Greek letter mu (μ), quantifies the force needed to move one fluid layer over another. For Newtonian fluids like water and air, the relationship between the shearing stress and the rate of shearing strain is linear, meaning their viscosity remains constant regardless of the applied stress.
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Determination of Molar Masses of Polymers II

Polymer samples typically consist of macromolecular chains with a distribution of lengths, resulting in a range of molar masses rather than a single discrete value. Conventional descriptors such as the number-average molar mass and weight-average molar mass quantify this distribution but do not fully capture polymer behavior in solution..The viscosity-average molar mass provides a more realistic description of polymer behavior in solution because it accounts for the enhanced contribution of...

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Measurement of the Rheology of Crude Oil in Equilibrium with CO2 at Reservoir Conditions
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Viscosity function in polymer-modified asphalts.

J Stastna1, L Zanzotto, O J Vacin

  • 1Bituminous Materials Chair, Faculty of Engineering, University of Calgary, AB T2N 1N4, Canada. stastna@ucalgary.ca

Journal of Colloid and Interface Science
|March 26, 2003
PubMed
Summary

Studying the viscosity of polymer-modified asphalt reveals unique behaviors not seen in dynamic tests. This viscosity analysis is crucial for understanding how modifiers like styrene-butadiene-styrene and ethylene-vinyl acetate affect asphalt properties.

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Area of Science:

  • Materials Science
  • Chemical Engineering
  • Rheology

Background:

  • Asphalt exhibits complex rheological behavior, similar to low-molecular-weight polymers.
  • Polymer modification is common for enhancing asphalt properties.
  • Traditional dynamic studies may not fully capture the characteristics of polymer-modified asphalts.

Purpose of the Study:

  • To investigate the viscosity of asphalt modified with styrene-butadiene-styrene (SBS) and ethylene-vinyl acetate (EVA) polymers.
  • To complement dynamic studies by examining rheological behavior in the transition region from viscoelastic fluid to Newtonian fluid.
  • To identify characteristic behaviors influenced by polymer modifiers.

Main Methods:

  • Viscosity measurements of base asphalt and asphalt modified with varying concentrations of SBS and EVA polymers.
  • Analysis of rheological data in the transition zone between viscoelastic and Newtonian fluid behavior.

Main Results:

  • Polymer modification significantly alters the rheological properties of asphalt.
  • Viscosity studies in the transition region reveal distinct behaviors associated with specific polymer modifiers.
  • The findings complement information obtained from dynamic experimental studies.

Conclusions:

  • Viscosity measurements in the transition region provide valuable insights into polymer-modified asphalt behavior.
  • This approach enhances the understanding of how SBS and EVA polymers influence asphalt rheology.
  • The study highlights the importance of complementary testing methods for characterizing advanced asphalt materials.