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Classification and Mechanical Properties of Synthetic Polymers

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Mechanically Robust Biopolymer Optical Fibers with Enhanced Performance in the Near-Infrared Region.

Jani Patrakka1, Ville Hynninen1, Manu Lahtinen2

  • 1Faculty of Engineering and Natural Sciences, Tampere University, Korkeakoulunkatu 6, FI-33720 Tampere, Finland.

ACS Applied Materials & Interfaces
|July 31, 2024
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Summary

Researchers developed novel biopolymer optical fibers using alginate and methylcellulose. These sustainable fibers offer high mechanical strength and thermal stability for applications in sensing and advanced biomedical fields, replacing traditional synthetic polymers.

Keywords:
biopolymerscompositesfiber spinninghumidity sensingoptical fibers

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Area of Science:

  • Materials Science
  • Polymer Science
  • Biotechnology

Background:

  • Polymer optical fibers (POFs) are essential in various industries but are typically made from nonrenewable synthetic polymers.
  • Existing biopolymeric optical fibers lack sufficient mechanical, thermal, and optical properties for practical use.
  • There is a need for sustainable, high-performance optical fibers derived from renewable resources.

Purpose of the Study:

  • To develop and characterize novel biopolymer optical fibers with enhanced mechanical strength and thermal stability.
  • To explore the potential of these biobased fibers for short-distance optical applications, including sensing.
  • To investigate their suitability for advanced biomedical applications, particularly in the near-infrared (NIR) region.

Main Methods:

  • Fabrication of composite biopolymer optical fibers using alginate and methylcellulose via scalable wet spinning at ambient conditions.
  • Comprehensive testing of mechanical properties, including maximum strain, Young's modulus, modulus of toughness, and strength.
  • Evaluation of thermal stability and optical performance, especially in the NIR spectrum.

Main Results:

  • Successfully fabricated 21 combinations of biopolymer composite fibers with tunable properties.
  • Achieved high mechanical performance: maximum strain up to 58%, Young's modulus up to 11 GPa, modulus of toughness up to 63 MJ/m³, and strength up to 195 MPa.
  • Demonstrated high thermal stability, enabling applications in humidity and touch sensing, and maintaining light transmission in complex fiber shapes.

Conclusions:

  • Biopolymer optical fibers based on alginate and methylcellulose offer a sustainable alternative to synthetic POFs.
  • These fibers exhibit superior mechanical properties, comparable to glass optical fibers in toughness and significantly higher in strain tolerance.
  • The developed fibers show promise for short-distance optical applications, advanced sensing, and future biomedical uses, utilizing fossil fuel-free resources.