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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.
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Fiber-reinforced concrete significantly enhances the structural and nonstructural properties of traditional concrete by incorporating fibers like steel, glass, and polymers. These fibers, varying from natural ones such as sisal and cellulose to manufactured ones like polypropylene and Kevlar, are mixed into hydraulic cement with aggregates. Steel fibers, often preferred for their robustness, contribute to improved ductility, toughness, and post-cracking performance. The concrete is classified...
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Procedure for Fabricating Biofunctional Nanofibers
09:39

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Published on: September 10, 2012

Patterned functional carbon fibers from polyethylene.

Marcus A Hunt1, Tomonori Saito, Rebecca H Brown

  • 1Polymer Matrix Composites Group, Materials Science and Technology Division, Oak Ridge National Laboratory, Oak Ridge, TN 37831-6053, USA.

Advanced Materials (Deerfield Beach, Fla.)
|March 29, 2012
PubMed
Summary
This summary is machine-generated.

Novel melt-processable precursors create unique carbon fibers with tunable morphologies, from hollow to gear-shaped. Processing conditions control microstructural and topological properties for diverse applications.

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Area of Science:

  • Materials Science
  • Polymer Chemistry
  • Nanotechnology

Background:

  • Carbon fibers are advanced materials with diverse applications.
  • Controlling carbon fiber morphology is crucial for tailoring properties.
  • Existing methods for carbon fiber production have limitations.

Purpose of the Study:

  • To develop a novel melt-processable precursor for carbon fiber synthesis.
  • To investigate the influence of processing conditions on carbon fiber morphology and microstructure.
  • To demonstrate the versatility of the produced carbon fibers for various applications.

Main Methods:

  • Synthesis of a novel melt-processable precursor.
  • Melt spinning of the precursor into fibers.
  • Controlled thermal treatment (carbonization and graphitization) under varying conditions.
  • Microstructural characterization using electron microscopy (SEM, TEM).
  • Topological analysis of fiber surfaces and cross-sections.

Main Results:

  • Successfully produced carbon fibers with unique morphologies, including hollow circular and gear-shaped structures.
  • Demonstrated that processing conditions (e.g., temperature, draw ratio) significantly influence fiber morphology and microstructure.
  • Observed distinct microstructural features, such as controlled porosity and graphitic ordering, correlating with processing parameters.
  • The resulting carbon fibers exhibit tunable mechanical and thermal properties.

Conclusions:

  • A novel melt-processable precursor enables the facile production of carbon fibers with controlled, unique morphologies.
  • Processing conditions are key determinants of the microstructural and topological characteristics of the synthesized carbon fibers.
  • The developed carbon fibers possess properties amenable to a wide range of advanced applications, including composites, energy storage, and filtration.