Chicken feather keratin and PHA bio-based biodegradable polymer films

Overview

This research proposes a novel bio-based and biodegradable polymer film created by blending chicken feather keratin with polyhydroxyalkanoates (PHAs). Chicken feathers, a significant agricultural waste stream composed of over 90% keratin protein, are being repurposed as a co-polymer component to enhance the properties of PHA-based films. The resulting material aims to deliver a sustainable alternative to conventional petroleum-based plastics, offering both environmental benefits and improved functional performance for packaging and protective film applications.

The core value proposition lies in transforming a low-value waste product into a high-performance, fully biodegradable material. Preliminary evidence suggests that even small amounts of keratin blended with PHA can significantly reduce both oxygen and water permeation, making these films attractive for applications requiring strong barrier properties. The approach is industrially feasible and represents a novel pathway in sustainable polymer science.

Technical specifications

Key features:

• Keratin extraction: Chicken feather keratin is extracted using sulfitolysis, a chemical process that breaks down the feather structure to isolate usable protein.
• Polymer blending: Hydroxyalkanoic acids and keratin are polymerized at varying ratios through condensation reactions to optimize film properties.
• Film fabrication: Films are prepared via melt pressing, a scalable manufacturing technique suitable for industrial production.
• Enhanced barrier properties: Keratin-PHA blends significantly reduce oxygen and water vapor permeation compared to pure PHA films.
• Comprehensive characterization: Films will be tested for mechanical strength, viscoelasticity, morphology (XRD), thermal stability (TGA), water and oxygen permeability, and elemental composition.
• Biodegradability assessment: End-of-life performance will be validated through biodegradation and compostability testing.

Potential applications:

• Food packaging requiring oxygen and moisture barriers
• Agricultural mulch films
• Single-use protective films
• Compostable packaging materials

Technology readiness level

This technology is currently at an early research and development stage. The concept is supported by published findings demonstrating that keratin-PHA blends exhibit improved barrier properties, and the research team has outlined a clear validation plan covering material synthesis, film fabrication, and comprehensive performance testing. Future work will include purchasing raw materials, extracting keratin, polymerizing blends at varying ratios, preparing films via melt pressing, and conducting full characterization including biodegradation and compostability assessments. The approach leverages industrially feasible processing methods, positioning the technology for future scale-up and commercialization.