Functional thermoelectric composite endows cellulose paper with superior fire safety

Area of Science:

• Materials Science
• Chemical Engineering
• Nanotechnology

Background:

• Traditional paper materials possess inherent fire hazards, necessitating improved flame retardant solutions.
• Existing flame retardant methods often compromise material flexibility or thermoelectric properties.
• Graphene oxide (GO) based materials face challenges in balancing thermoelectric performance with mechanical integrity.

Purpose of the Study:

• To develop a paper material with enhanced flame retardancy and integrated fire detection capabilities.
• To overcome the limitations of graphene oxide (GO) in thermoelectric performance and flexibility for fire safety applications.
• To create a flexible, self-extinguishing paper with a rapid fire-warning system.

Main Methods:

• Co-assembly of graphene oxide (GO), ascorbic acid (LA), and phenoxycyclophosphazene (HP) to form a flexible lamellar thermoelectric composite (GO-LA-HP).
• Hybrid coating of phytic acid/phosphoric acid (PyA/PA) with the modified GO-LA-HP onto paper (creating GPP).
• Evaluation of flame resistance, self-extinguishing properties, and fire detection response time.

Main Results:

• The GO-LA-HP composite enhances fire sensitivity and flame resistance without compromising flexibility.
• The modified paper (GPP) exhibits immediate self-extinguishing properties in vertical combustion tests.
• GPP triggers a fire alarm signal within 3 seconds of flame contact and maintains response for over 600 seconds.
• The composite significantly reduces temperature rise (<150 °C) and provides a fire warning within 2 seconds.

Conclusions:

• The developed GPP demonstrates excellent flame resistance and rapid, reliable fire detection.
• The synergistic mechanisms of fire detection and flame retardancy in the composite material are clarified.
• This innovative material offers a promising solution for improving fire safety in paper-based products.