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A material's elastic behavior is characterized by the disappearance of stress once the load is removed, allowing the material to return to its original state. However, when stress surpasses the yield point, yielding commences, marking the onset of plastic deformation or permanent set. This change from elastic to plastic behavior is influenced by the peak stress value and the duration before the load is removed. An intriguing observation occurs when a specimen is loaded, unloaded, and...
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Shape Memory Polymers for Active Cell Culture
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Nerve Response to Superelastic Shape Memory Polyurethane Aerogels.

Martina Rodriguez Sala1, Omar Skalli2, Nicholas Leventis3

  • 1Department of Physics and Materials Science, University of Memphis, Memphis, TN 38152, USA.

Polymers
|December 18, 2020
PubMed
Summary
This summary is machine-generated.

Superelastic shape memory polyurethane aerogels (SSMPA) were used as scaffolds for neuronal cells. Optimized SSMPA parameters promote nerve regeneration by enhancing neurite length.

Keywords:
PC12 neuronal cellsaerogelscaffoldstiffnesssuperelastic shape memory polyutherane aerogeltopography

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Area of Science:

  • Biomaterials Science
  • Neuroscience
  • Materials Engineering

Background:

  • Aerogels show promise as scaffolds for neuronal cells.
  • Superelastic shape memory polyurethane aerogels (SSMPA) offer tunable mechanical properties.

Purpose of the Study:

  • Investigate the influence of SSMPA stiffness, pore size, and surface roughness (Sa) on neuronal cell process extension.
  • Determine optimal SSMPA parameters for nerve regeneration.

Main Methods:

  • Utilized a custom apparatus to induce radial compression in SSMPA, altering pore diameter and Sa.
  • Compared neurite extension of PC12 cells on SSMPA with varying pore sizes and Sa.
  • Assessed neurite number and length in response to different SSMPA physical parameters.

Main Results:

  • Radial compression decreased SSMPA pore diameter and Sa.
  • PC12 cells on highly compressed SSMPA extended fewer but significantly longer neurites.
  • SSMPA with 1.9 µm pore diameter, 1.17 µm Sa, and 203 kPa stiffness showed optimal results.

Conclusions:

  • SSMPA's tunable physical properties influence neuronal cell behavior.
  • Optimized SSMPA parameters, specifically pore size, Sa, and stiffness, are crucial for enhancing nerve regeneration.
  • Developed SSMPA provide a promising scaffold for nerve tissue engineering.