A gradient-structured all-cellulose biofoam enabled by solvent-induced molecular assembly for sustainable insulation...

Area of Science:

• Materials Science
• Green Chemistry
• Sustainable Manufacturing

Background:

• Petrochemical-based foams are widely used but raise environmental concerns due to increasing demand.
• There is a critical need for sustainable alternatives in industrial and construction applications.

Purpose of the Study:

• To develop an all-cellulose molecular foam as an eco-friendly substitute for conventional foams.
• To investigate the structural, thermal, mechanical, and manufacturing properties of the novel cellulose foam.

Main Methods:

• Utilized ethanol-induced cellulose molecular programmed assembly to create the foam.
• Characterized the foam's porous structure, thermal stability, thermal conductivity, and compressive modulus.
• Assessed the foam's suitability for various shaping processes and performed a life cycle assessment.

Main Results:

• The all-cellulose foam exhibits a honeycomb-like gradient porous structure.
• Achieved a high compressive modulus (11.8 MPa), high thermal stability (264.1°C), and low thermal conductivity (0.047 W m⁻¹ K⁻¹).
• Demonstrated versatility in shaping processes and significant reduction in carbon emissions compared to petrochemical foams.

Conclusions:

• The developed all-cellulose molecular foam is a viable, recyclable, and biodegradable alternative to petrochemical foams.
• Its properties make it suitable for diverse building and industrial applications.
• The foam offers substantial environmental benefits, particularly in reducing carbon emissions.