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Area of Science:

  • Materials Science
  • Polymer Chemistry
  • Sustainable Architecture

Background:

  • Cotton paper, a cellulose-based material, is ideal for humidity-sensing and bio-architecture but suffers from flammability.
  • Developing sustainable and effective flame-retardant solutions for cellulosic materials is crucial.

Purpose of the Study:

  • To create an environmentally benign flame-retardant coating for cotton paper using renewable polyelectrolytes.
  • To evaluate the efficacy of chitosan/phytic acid coatings in reducing flammability for bio-architecture.

Main Methods:

  • Layer-by-layer (LbL) assembly was used to deposit thin films of chitosan (CH) and phytic acid (PA) onto cotton paper.
  • Microscale combustion calorimetry was employed to measure the reduction in peak heat release rate.

Main Results:

  • A coating of only four bilayers (BL) of CH/PA was sufficient to impart self-extinguishing properties.
  • The CH/PA coating achieved a significant 69% reduction in peak heat release rate.
  • The developed coating is fully renewable and environmentally benign.

Conclusions:

  • Renewable intumescent LbL-assembled CH/PA films offer an effective flame-retardant solution for cotton paper.
  • This method provides a sustainable approach to enhance the safety of bio-architecture materials.
  • The flame-retardant treatment has potential applications for various cellulosic materials.