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Related Concept Videos

Plastic Behavior01:21

Plastic Behavior

422
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...
422

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Related Experiment Video

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Fabrication of a Bioactive, PCL-based "Self-fitting" Shape Memory Polymer Scaffold
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Thermoplastic Blend Exhibiting Shape Memory-Assisted Self-Healing Functionality.

Swapnil Bhattacharya1, Richard Hailstone2, Christopher L Lewis3

  • 1Department of Mechanical Engineering, Rochester Institute of Technology, RochesterNew York 14623-5603, United States.

ACS Applied Materials & Interfaces
|September 15, 2020
PubMed
Summary
This summary is machine-generated.

This study developed a polymer blend of thermoplastic polyurethane (TPU) and polycaprolactone (PCL) that exhibits shape memory and self-healing properties. Optimal blends show significant property recovery after damage, offering potential for advanced material applications.

Keywords:
polycaprolactone (PCL)reversible plasticityself-healingshape memorythermoplastics polyurethane (TPU)

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Area of Science:

  • Materials Science
  • Polymer Science
  • Mechanical Engineering

Background:

  • Thermoplastic polyurethane (TPU) is a versatile elastomer, but lacks self-healing capabilities.
  • Polycaprolactone (PCL) is a biodegradable polyester known for its low melting point and healing properties.
  • Combining these polymers could create materials with enhanced functionalities.

Purpose of the Study:

  • To investigate the mechanical, thermal, shape memory, and self-healing properties of TPU/PCL polymer blends.
  • To determine the optimal PCL content for achieving shape memory and self-healing.
  • To evaluate the potential of these blends as replacements for pure TPU or as advanced functional polymers.

Main Methods:

  • Preparation of polymer blends with varying PCL content (up to 60 wt %).
  • Characterization of mechanical properties, thermal transitions, shape memory effect (reversible plasticity shape memory - RPSM), and self-healing efficiency.
  • Evaluation of healing through crack filling by molten PCL and RPSM-assisted surface contact.

Main Results:

  • TPU/PCL blends exhibit distinct thermal transitions from both polymers.
  • The blends demonstrate shape memory capability at moderate temperatures (90 °C) and melt processability at higher temperatures (>160 °C).
  • Blends with up to 30 wt % PCL showed nearly complete property restoration after healing, while pure TPU had only 5% healing efficiency. Higher PCL concentrations (50-60 wt %) showed limited healing due to necking and poor high-temperature mechanical properties.

Conclusions:

  • TPU/PCL blends offer a promising route to developing self-healing and shape memory materials.
  • Optimal blend compositions can replace pure TPU in existing applications or enable new uses in soft robotics, biomedical devices, and microelectronics.
  • The combination of RPSM and PCL flow facilitates efficient self-healing through mild heating.