CaCO₃ blowing agent mixing method for biomass composites improved buffer packaging performance

Area of Science:

• Materials Science
• Polymer Science
• Sustainable Materials

Background:

• Petroleum-based packaging materials pose environmental concerns.
• Development of biodegradable alternatives is crucial for sustainable packaging solutions.
• Achieving uniform foam structures in biodegradable composites presents a challenge.

Purpose of the Study:

• To develop biodegradable composites with an open-cell structure as replacements for petroleum-based packaging.
• To investigate the effect of calcium carbonate (CaCO3) as a nucleating agent on composite foam properties.
• To optimize the CaCO3 content for enhanced cushioning and material stability.

Main Methods:

• Preparation of biodegradable composites using CaCO3 as a nucleating agent.
• Characterization of composite cell structure, density, and cushioning performance.
• Evaluation of thermal stability and moisture absorption properties.
• X-ray diffraction (XRD) analysis to determine changes in material crystallinity.

Main Results:

• Addition of 5 wt% CaCO3 resulted in uniform and dense composite cells with improved cushioning.
• Higher CaCO3 content led to decreased cell density and cushioning properties.
• CaCO3 enhanced thermal stability and water barrier properties, reducing moisture absorption by 15%.
• XRD analysis confirmed that CaCO3 disrupted starch crystallinity, promoting homogeneous slurry formation and uniform foaming.

Conclusions:

• CaCO3 effectively acts as a nucleating agent to produce uniform biodegradable composite foams.
• Optimizing CaCO3 content is critical for achieving desired cushioning and material properties.
• These biodegradable composites offer a sustainable alternative to petroleum-based packaging with improved performance characteristics.