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Related Concept Videos

Poisson's Ratio01:23

Poisson's Ratio

Poisson's ratio is a material property that indicates their stress response. It explains the connection between the elongation or compression a material undergoes in the direction of an applied force and the contraction or expansion it experiences perpendicular to that force. When a slender bar is loaded axially, it stretches in the direction of the force and contracts laterally. Poisson's ratio is the negative ratio of this lateral contraction to the axial elongation. The negative sign ensures...
Molecular Weight of Step-Growth Polymers01:08

Molecular Weight of Step-Growth Polymers

Step growth polymerization involves bi or multifunctional monomers. Bifunctional monomers react to form linear step growth polymers, whereas multifunctional monomers react to form non-linear or branched polymers.
As the step-growth polymerization involves step-wise condensation of monomers, the molecular weight also builds up eventually. Consequently, high molecular weight polymers are obtained at the late stages of the polymerization, where 99% of monomers have been consumed.
The extent of the...
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Negative Regulator Molecules

Positive regulators allow a cell to advance through cell cycle checkpoints. Negative regulators have an equally important role as they terminate a cell’s progression through the cell cycle—or pause it—until the cell meets specific criteria.

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Three-Dimensional Polymer Constructs Exhibiting a Tunable Negative Poisson's Ratio.

David Y Fozdar1, Pranav Soman, Jin Woo Lee

  • 1Department of Mechanical Engineering, The University of Texas at Austin, 204 E. Dean Keaton St., ETC 1.210A, Austin, TX 78712, USA.

Advanced Functional Materials
|August 16, 2011
PubMed
Summary

Researchers created 3D polyethylene glycol scaffolds with tunable negative Poisson's ratios using digital micromirror device projection printing. These auxetic scaffolds offer unique mechanical support properties for various applications.

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Area of Science:

  • Materials Science
  • Polymer Science
  • Mechanical Engineering

Background:

  • Young's modulus and Poisson's ratio characterize a scaffold's mechanical response to stress.
  • Most materials exhibit positive Poisson's ratios, but negative values (auxetic behavior) offer unique advantages.
  • Auxetic materials exhibit counterintuitive expansion under compression.

Purpose of the Study:

  • To fabricate 3D polyethylene glycol (PEG) scaffolds with tunable negative Poisson's ratios.
  • To investigate the relationship between scaffold architecture and auxetic properties.
  • To validate the mechanical performance of these novel scaffolds.

Main Methods:

  • Fabrication of single-layer and multilayer PEG scaffolds using Digital Micromirror Device Projection Printing (DMD-PP).
  • Design of unit-cellular structures with specific geometries and arrangements to control Poisson's ratio.
  • Strain experiments to measure the Poisson's ratios of fabricated scaffolds.

Main Results:

  • Successfully fabricated 3D PEG scaffolds exhibiting tunable negative Poisson's ratios.
  • Demonstrated that unit-cellular structures effectively tune the magnitude and polarity of Poisson's ratio.
  • Validated that analytical models accurately predict the Poisson's ratios of both single- and multilayer constructs.
  • Confirmed no interlayer slipping and consistent Poisson's ratio with added layers in multilayer constructs.

Conclusions:

  • DMD-PP is a viable method for creating 3D auxetic PEG scaffolds.
  • Scaffold architecture is critical for achieving tunable negative Poisson's ratios.
  • The developed scaffolds show predictable and stable auxetic mechanical behavior.