Lightweight bio-based and biodegradable polymer composites using PHA and expandable microspheres
Lightweight polymer composites combining polyhydroxyalkanoates (PHA) with expandable microspheres to reduce material density while maintaining thermoplastic recyclability. The approach uses twin-screw extrusion to activate microsphere expansion, enabling lighter structures for sustainable applications such as food packaging and other eco-friendly products.
Overview
A research effort is developing lightweight bio-based and biodegradable polymer composites by combining Polyhydroxyalkanoates (PHA) with expandable microspheres. The composites are designed to reduce material density for sustainable applications such as food packaging. PHA is described as a marine-degradable polymer, while the microspheres expand upon heating to significantly lower composite weight. The approach targets biodegradability and compatibility with fiber repulping and PET recycling workflows.
Technical specifications
- Polyhydroxyalkanoates (PHA): A bio-based, marine-degradable polymer with a density of approximately 1.2 g/cm³.
- Expancel Microspheres: Thermoplastic shells containing volatile hydrocarbons that expand by about 40× in volume when heated, reducing composite density to 0.8–0.9 g/cm³.
- Processing: Compounded using twin-screw extrusion above PHA’s melting point (40 °C to 180 °C) to activate microsphere expansion for lightweight structures.
- Applications: Suitable for food-grade applications with FDA-approved Expancel; compatible with PE/PP injection molding grades.
- Recyclability: Thermomechanically recyclable, preserving the thermoplastic nature of the resins.
Technology readiness level
Currently at Technology Readiness Level 2, the work is in the formulation stage. Future validation includes defining performance targets, sourcing materials from multiple suppliers, and characterizing the composites’ mechanical properties and biodegradability.
About University of California, Los Angeles
The University of California, Los Angeles is a comprehensive public research university anchored in a global city and serving a large, diverse student body. Industry engages through an integrated academic health system that enables clinical research and translation, extensive shared instrumentation and cleanrooms, and co‑located labs that support prototyping. A new research and technology park and proximity to Southern California’s innovation economy provide convenient pathways for collaboration, sponsored projects, and access to talent. Campus research is supported by competitive federal funding from agencies such as NIH, NSF, DOE, and the Department of Defense. A dedicated technology transfer office streamlines IP protection, licensing, industry‑sponsored research, and startup incubation.
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