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Enhanced Foamability with Shrinking Microfibers in Linear Polymer.

Eric S Kim1, Heon E Park2, Carlos R Lopez-Barron3

  • 1Department of Mechanical and Industrial Engineering, University of Toronto, 5 King's College Road, Toronto, ON M5S 3G8, Canada. ericskim@mie.utoronto.ca.

Polymers
|April 10, 2019
PubMed
Summary
This summary is machine-generated.

Smart microfiber blending offers a cost-effective way to enhance polymer strain hardening. Compounding polymers with shrinking microfibers significantly improves rheological properties and foam morphology, allowing tailored material behavior.

Keywords:
in situ shrinking microfiberpolymeric foamingstrain hardening

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Area of Science:

  • Materials Science
  • Polymer Science
  • Rheology

Background:

  • Strain hardening is crucial for polymer processing, but traditional methods like chemical branching are costly.
  • Controlling strain hardening is essential for applications such as foaming, film forming, and fiber extrusion.

Purpose of the Study:

  • To investigate the impact of compounding polymers with microfibers on rheological behavior and foam morphology.
  • To evaluate the effectiveness of smart microfiber blending technology for cost-efficient strain hardening control.

Main Methods:

  • Utilized shear and extensional rheometry to assess polymer-microfiber composites.
  • Investigated foam morphologies formed by batch physical foaming with carbon dioxide.
  • Compared the effects of in situ shrinking microfibers versus nonshrinking microfibers.

Main Results:

  • Compounding with in situ shrinking microfibers significantly enhanced strain hardening compared to nonshrinking microfibers.
  • Shrinking microfibers led to a greater increase in both loss and storage modulus at low frequencies.
  • Physical foaming experiments showed increased cell population density and expansion ratio with shrinking microfibers.

Conclusions:

  • Smart microfiber blending, particularly with shrinking microfibers, offers a viable and cost-efficient method to improve polymer strain hardening.
  • The observed enhancement in strain hardening is tunable by adjusting processing conditions, such as temperature.
  • This technology enables precise control over material properties for advanced polymer processing.