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Types of Step-Growth Polymers: Polyesters01:20

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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...
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Sustainable Photocatalytic Desizing Process for the Starch-Based Size.

Sanjay Kumar Bhikari Charan Panda1, Kushal Sen1, Samrat Mukhopadhyay1

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Ultraviolet C (UVC)-assisted desizing offers a sustainable textile pretreatment. This innovative method significantly reduces water, energy, and time, leading to eco-friendly fabric processing.

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Area of Science:

  • Textile Chemistry
  • Environmental Science
  • Materials Science

Background:

  • Textile wet processing consumes substantial water and energy, generating significant effluent.
  • Conventional desizing methods contribute to environmental pollution and resource depletion.

Purpose of the Study:

  • To develop an Ultraviolet C (UVC)-assisted desizing method for starch-sized cotton fabric.
  • To reduce utility consumption (water, energy, time) in textile pretreatment.
  • To enhance the sustainability of textile processing.

Main Methods:

  • A UVC cabinet was designed to control exposure parameters (temperature, energy).
  • Optimized UVC exposure time and washing conditions (time, temperature, alkali) for desizing efficiency.
  • Incorporated oxidizing agents (NaNO2, K2S2O8, NaBO3·4H2O) during sizing for improved desizing.
  • Characterized UVC-assisted desized fabric using whiteness index, water absorbency, tensile strength, FTIR, and XRD.

Main Results:

  • Achieved 95% desizing efficiency with UVC-assisted method, improved to 100% with oxidizing agents.
  • Reduced alkali consumption by 75% and washing temperature/time.
  • UVC-assisted desizing saves ~60% water, ~90% energy, and >70% time.
  • Life cycle analysis shows >85% reduction in human health impact and ~69% mineral resource savings.

Conclusions:

  • UVC-assisted desizing is a highly efficient and sustainable alternative to conventional methods.
  • The process significantly lowers environmental impact and resource consumption.
  • This novel approach is readily adoptable by the textile industry for eco-friendly operations.