Self-Cross-Linking Hydrophobic Flame-Retardant Fluorescent Aerogel without External Modifiers.

Area of Science:

• Materials Science
• Polymer Chemistry
• Nanotechnology

Background:

• Hydrophobizing hydrophilic aerogels is challenging, often degrading essential properties like density and mechanical strength.
• Existing methods frequently rely on external modifiers, which can negatively impact aerogel performance.

Purpose of the Study:

• To develop a self-cross-linking hydrophobic aerogel without external modifiers.
• To achieve enhanced mechanical properties, hydrophobicity, flame retardancy, and fluorescence in aerogels.

Main Methods:

• Investigated the reaction between a maleic anhydride copolymer and ammonia with ammonium alginate.
• Utilized a ring-opening reaction for hybrid cross-linking, inducing a hydrophilic-to-hydrophobic transition.
• Analyzed structural changes and the influence of raw material ratios on aerogel performance.

Main Results:

• Developed a self-cross-linking aerogel with enhanced mechanical strength (resilient to 80% compression) and hydrophobicity (contact angle of 131°).
• Achieved inherent flame retardancy and fluorescence without external additives.
• Demonstrated a successful hydrophilic-to-hydrophobic transition during the self-cross-linking process.

Conclusions:

• This novel approach creates advanced polymer aerogels with superior hydrophobicity and flame retardancy.
• The self-cross-linking strategy avoids performance compromises associated with external modifiers.
• The resulting aerogels offer enhanced versatility due to their combined properties.