Low-density, injection-moldable PLA–TPS biocomposites for sustainable packaging
Innovative PLA–TPS biocomposites offer a sustainable, lightweight alternative to conventional packaging materials. These bio-based, recyclable composites reduce density with hollow fillers and are suitable for food-contact applications, aiming to replace PE/PP.
Overview
The proposed PLA–TPS biocomposites present a groundbreaking solution for sustainable packaging, leveraging the natural benefits of polylactic acid (PLA) and thermoplastic starch (TPS). By incorporating hollow fillers such as cellulose aerogels and silica microspheres, the composite achieves a density below 1 g/cm³, making it a lighter alternative to traditional polyethylene (PE) and polypropylene (PP) materials. These biocomposites are designed to be bio-based, recyclable, and safe for direct food contact, offering a drop-in replacement for conventional packaging solutions.
Technical specifications
Key features:
- Material Composition: PLA enhanced with 10–30 wt% TPS and 5–15 wt% hollow fillers.
- Density and Flow Optimization: Achieves a melt-flow index of 25–55 g/10 min through the use of plasticizers and compatibilizers like PLA-g-MA.
- Sustainability: Fully or predominantly bio-based and recyclable, suitable for food-contact closures.
- Mechanical Properties: Tunable density, flow, and mechanical properties through varying filler loading and plasticizer content.
Technology readiness level
This technology is currently at TRL 3, with a structured plan to advance to TRLs 4–5. The development phases include formulating base composites, conducting comprehensive mechanical and thermal testing, and prototyping for injection molding. The project aims to deliver scalable formulations and regulatory packages for FDA/EFSA clearance, ensuring readiness for future commercialization.
About University of Maine
The University of Maine is a comprehensive public research university and the state’s flagship, coupling broad academic depth with an applied, industry‑oriented culture. On campus, companies access large‑scale prototyping facilities, pilot‑scale lines, and specialized test tanks that move concepts toward deployable systems. A statewide Cooperative Extension and field sites connect R&D teams to real‑world conditions across Maine’s coastal, forested, and cold‑weather settings, while industry liaisons streamline sponsored research. Funding comes from competitive federal sources such as the National Science Foundation, Department of Energy, U.S. Department of Agriculture, and the National Oceanic and Atmospheric Administration, while a centralized tech transfer office supports IP, licensing, SBIR/STTR, and startup formation.
delivered to your inbox.