Biodegradable starch and hemicellulose foams with tunable hydrophobicity for sustainable packaging and insulation
Carbohydrate-based foam technology offering temporary water resistance (1–2 days) while remaining fully biodegradable in soil, compost, and water within 2+ months. Developed using twin-screw extrusion with starch, hemicellulose, plasticizer, and a hydrophobic agent, targeting sustainable alternatives to petroleum-based foams in packaging and thermal insulation applications.
Overview
This technology delivers foam materials made from renewable carbohydrate polymers (starch and hemicellulose) that balance short-term water resistance with long-term environmental biodegradability. The foams are designed to repel liquids for approximately one to two days under normal exposure conditions, making them suitable for packaging, insulation, and other single-use or short-lifecycle applications. After this service window, the materials fully degrade in soil, compost, and water environments over a period of two months or longer, offering a sustainable alternative to conventional petroleum-based expanded foams.
The core value proposition is a tunable degradation profile: by adjusting the ratio of starch to hemicellulose, the type and amount of plasticizer (glycerol), and the incorporation of a wax-based hydrophobic agent, the material can be tailored for specific application windows. This makes the technology attractive for industries seeking to reduce plastic waste while maintaining functional performance during the product's useful life.
Technical specifications
Material composition:
- Starch and hemicellulose as the primary carbohydrate polymer matrix
- Glycerol used as a plasticizer to control flexibility and processing behavior
- Wax incorporated as a hydrophobic agent to tune water resistance
- Water used as the blowing agent during foam expansion
Processing method:
- Foams are produced via twin-screw extrusion using a DSM Xplorer mini lab extruder
- Five starch types and hemicellulose feedstocks are evaluated in combination with ADM
- Five levels of glycerol plasticizer are tested to map the processing and performance window
Characterization and testing:
- Density and pore size analysis to assess foam morphology
- Strength properties to evaluate mechanical performance
- Water contact angle and water absorption measurements to quantify hydrophobicity
- Thermal conductivity testing to determine insulation performance
Key advantages:
- Renewable, bio-based raw materials
- Tunable balance between hydrophobicity and biodegradability
- Extrusion-based processing compatible with scalable manufacturing
Technology readiness level
The technology is currently at an early-to-mid stage of development (TRL 3–4). Starch and hemicellulose foams have already been successfully extruded and characterized, and prior work has demonstrated degradation of these carbohydrate polymers in simulated body fluids and lake water environments. Published results in the International Journal of Biological Macromolecules (Vol. 104, pp. 564–575) support the biodegradability of the base polymers.
Remaining development work includes optimizing foam compositions for thermal insulation performance, refining the hydrophobic treatment to achieve consistent water resistance, and conducting systematic biodegradation studies in soil, compost, and water over multi-month timelines. Once these validation steps are complete, the technology will be positioned for pilot-scale demonstration and partner-driven application development.
About North Carolina State University
North Carolina State University is a large, comprehensive public land‑grant research university in Raleigh. Its on‑campus research and technology park co‑locates corporate R&D groups, government partners, and faculty labs, enabling shared facilities, prototyping, and agile contracting. Located in North Carolina’s Research Triangle, partners tap a dense regional ecosystem while engaging through a statewide extension network and a mature co‑op program that deliver field deployment and workforce pipelines. Multiple pilot and demonstration facilities support scale‑up and validation toward pre‑commercial readiness. Research is supported by competitive funding from major federal agencies, including NSF, USDA, DOE, and DOD, and a dedicated technology transfer office with clear IP pathways helps accelerate commercialization.
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