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Related Concept Videos

Types of Step-Growth Polymers: Polyesters01:20

Types of Step-Growth Polymers: Polyesters

The introduction of polyesters has brought major development to the textile industry. The wrinkle-free behavior of polyester blends has eliminated the need for starching and ironing clothes.
Polyesters are commonly prepared from terephthalic acid and ethylene glycol; the crude product is known as poly(ethylene terephthalate) or PET. However, polyesters are synthesized industrially by transesterification of dimethyl terephthalate with ethylene glycol at 150 °C. The two reactants and the polymer...
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Step-growth or condensation polymerization is a stepwise reaction of bi or multifunctional monomers to form long-chain polymers. As all the monomers are reactive, most of the monomers are consumed at the early stages of the reaction to form small chains of reactive oligomers, which then combine to form long polymer chains in the late stages. Hence, the reaction has to proceed for a long time to achieve high molecular weight polymers.
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Molecular Weight of Step-Growth Polymers

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Microfluidic Fabrication of Polymeric and Biohybrid Fibers with Predesigned Size and Shape
07:38

Microfluidic Fabrication of Polymeric and Biohybrid Fibers with Predesigned Size and Shape

Published on: January 8, 2014

Polymer microstructured fibers by one-step extrusion.

M Mignanelli1, K Wani, J Ballato

  • 1The School of Materials Science and Engineering and the Center for Optical Materials Science and Engineering Technologies, Clemson University, Clemson, SC 29634 USA.

Optics Express
|June 24, 2009
PubMed
Summary
This summary is machine-generated.

Researchers developed a new melt extrusion method to create complex polymer microstructured fibers. This high-volume, low-cost technique enables advanced optical engineering for fashion and military applications.

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Area of Science:

  • Materials Science
  • Optical Engineering
  • Polymer Science

Background:

  • Microstructured fibers offer unique optical properties.
  • Current manufacturing methods for microstructured fibers are often complex and costly.
  • There is a need for scalable, cost-effective production of these advanced materials.

Purpose of the Study:

  • To develop a novel method for direct, high-volume production of polymer-based microstructured fibers with complex cross-sections.
  • To demonstrate the fabrication of specific microstructured fiber designs using melt extrusion.
  • To explore the optical properties and potential applications of these newly fabricated fibers.

Main Methods:

  • Utilized melt extrusion for direct fabrication of polymer microstructured fibers.
  • Produced single-polymer fibers with hexagonal air hole arrays.
  • Fabricated bicomponent fibers with approximately 60 coaxial rings.

Main Results:

  • Achieved continuous, high-volume manufacturing of microstructured fibers at rates exceeding 1200 m/min.
  • Observed strong visible iridescence in bicomponent fibers.
  • Demonstrated a mechanochromic response in the iridescence of the bicomponent fibers.

Conclusions:

  • Melt extrusion provides a scalable, low-cost manufacturing route for complex polymer microstructured fibers.
  • The developed technique facilitates the commoditization of microstructured fibers.
  • These fibers hold significant potential for optical engineering in fashion, marking, identification, and military applications.