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Related Concept Videos

Characteristics and Nomenclature of Copolymers01:24

Characteristics and Nomenclature of Copolymers

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Copolymers are the products obtained from the polymerization of multiple monomer species. So, in a polymer chain itself, there can be multiple repeating units that come from different monomers. The process of synthesizing a polymer from different monomer species is called copolymerization. When two monomers are involved, the polymer is known as a bipolymer. Polymers with three and four monomers are termed terpolymers and quaterpolymers, respectively. Figure 1 depicts the copolymerization of...
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Shear Diagram01:27

Shear Diagram

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In the study of beam mechanics, shear diagrams play a crucial role in understanding the distribution of shear forces along the length of a beam. Consider a beam AB that is supported at both ends and subjected to perpendicular loads.
First, a free-body diagram of the beam is drawn, representing all the external forces and internal reactions acting on the beam. One can calculate the reaction forces at each support by employing the equilibrium equations of force and moment. The vertical component...
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Shearing Stress01:19

Shearing Stress

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Shearing stress, denoted by the Greek letter tau (Ď„), is stress caused by forces acting transversely on an object. These forces create internal ones within the entity in the plane where the external forces are applied. The resultant of these internal forces is the shear in the section.
The average shearing stress can be calculated by dividing the shear by the area of the cross-section.
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Shearing Strain01:20

Shearing Strain

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The shearing strain represents a cubic element's angular change when subjected to shearing stress. This type of stress can transform a cube into an oblique parallelepiped without influencing normal strains. The cubic element experiences a significant transformation when exposed solely to shearing stress. Its shape alters from a perfect cube into a rhomboid, clearly demonstrating the effect of shearing strain. The degree of this strain is considered positive if it reduces the angle between the...
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Normal and Shear Force01:14

Normal and Shear Force

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When a beam is subjected to different loads, such as weight, pressure, or other external forces, internal forces are generated within the beam. These forces can have a significant impact on the overall stability and strength of the structure. Engineers use various methods to analyze and determine the magnitude and direction of these internal forces. One common technique used to determine internal forces in beams is the method of sections. This method involves considering an imaginary point or...
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Singularity Functions for Shear01:26

Singularity Functions for Shear

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In structural analysis, singularity functions are crucial in simplifying the representation of shear forces in beams under discontinuous loading. These functions describe discontinuous  variations in shear force across a beam with varying loads by using a single mathematical expression, regardless of the complexity of the loading conditions. The singularity functions are derived from creating a free-body diagram of the beam and then making conceptual cuts at specific points to examine the...
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Anionic Polymerization of an Amphiphilic Copolymer for Preparation of Block Copolymer Micelles Stabilized by &#960;-&#960; Stacking Interactions
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Star Block-Copolymers in Shear Flow.

Diego Jaramillo-Cano1, Maud Formanek1, Christos N Likos1

  • 1Faculty of Physics , University of Vienna , Boltzmanngasse 5 , A-1090 Vienna , Austria.

The Journal of Physical Chemistry. B
|March 17, 2018
PubMed
Summary
This summary is machine-generated.

Star block-copolymers (SBCs) exhibit complex structural and dynamic behaviors under shear flow. Their conformational properties and attractive patch formation are influenced by shear rate, offering potential for tuning complex fluid viscoelasticity.

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Area of Science:

  • Polymer Science and Engineering
  • Soft Matter Physics
  • Computational Materials Science

Background:

  • Star block-copolymers (SBCs) are versatile self-assembling molecules with tunable properties like softness, shape, and flexibility.
  • Understanding SBC behavior under external fields, such as shear flow, is crucial for designing advanced materials and complex fluids.

Purpose of the Study:

  • To investigate the conformational dynamics and attractive patch formation of isolated SBCs subjected to shear flow.
  • To analyze the influence of shear rate, functionality, amphiphilicity, and solvent quality on SBC behavior.
  • To provide insights into the rheological properties of semidilute SBC suspensions.

Main Methods:

  • Particle-based multiscale simulations were employed to model an isolated SBC under shear flow.
  • Systematic analysis of conformational properties and patch reorganization as a function of shear rate.

Main Results:

  • SBCs exhibit richer structural and dynamical behavior compared to athermal star polymers under shear flow.
  • Three key mechanisms drive patch reorganization: free arm addition, patch fusion, and patch fission at high shear rates.
  • Patch number and orientation are dependent on the applied shear rate.

Conclusions:

  • SBCs demonstrate significant potential for tuning the viscoelastic properties of complex fluids.
  • The conformational behavior of single SBCs under shear is a foundational step towards predicting bulk rheological properties.