Expanded Perlite-Reinforced Alginate Xerogels: A Chemical Approach to Sustainable Building and Packaging Materials

Area of Science:

• Materials Science
• Sustainable Engineering

Background:

• Development of novel bio-based materials is critical for sustainable construction and packaging.
• Lightweight, biodegradable xerogels show promise but require mechanical reinforcement.
• Alginate is a suitable matrix for composite materials with inorganic reinforcements.

Purpose of the Study:

• To develop and enhance biocomposite xerogel-structured foam materials.
• To investigate the effect of additives (plasticizers, reinforcement, stabilizer) on mechanical properties.
• To evaluate the potential of these materials for packaging and architectural applications.

Main Methods:

• Fabrication of alginate-based biocomposite xerogels with expanded perlite.
• Inclusion of additives: glycerol, gum arabic (plasticizers), chitosan (reinforcement), iota carrageenan (stabilizer) in varying weight ratios.
• Mechanical testing (modulus of elasticity, tensile strength) and material analysis (SEM, FTIR).

Main Results:

• Biocomposite xerogels exhibited improved mechanical behavior.
• The highest elastic modulus (1.96 MPa) was achieved with a combination of chitosan and glycerol.
• The greatest tensile strength (120 kPa) was observed in the specimen with chitosan and no plasticizers.

Conclusions:

• The developed alginate-perlite biocomposite xerogels show significant potential as sustainable packaging and architectural materials.
• Chitosan, particularly without plasticizers, significantly enhances tensile strength.
• The study provides insights into optimizing composite material composition for specific mechanical properties.