Bio-Based Resins: Sustainable Alternative to Oil-Based Composites | University of Oulu

Researchers at the University of Oulu in Finland announced today a breakthrough in materials science: the development of high-performance bio-based resins capable of replacing oil-based materials in composite products. The new resins, engineered to match or exceed the strength and cost-effectiveness of their fossil fuel counterparts, target industries including wind energy, boat building, and high-performance adhesives.

The resins are produced from biomass-derived platform chemicals sourced from forestry and agricultural side streams, such as sawdust and straw, effectively transforming waste into usable raw materials. According to Doctoral Researcher Mikko Salonen, the biomass-based polyester resin developed by the team demonstrates up to 76% higher tensile strength than commercially available fossil-based polyester resins.

Composite materials are critical components in a range of industries, and the shift towards bio-based alternatives addresses growing concerns about sustainability and reliance on finite resources. Epoxy resins, essential in adhesives and high-performance composites used in sports equipment and industrial components, and polyester resins, widely used in fiberglass structures like boats and caravans, are both targeted by this innovation.

Senior Research Fellow Juha Heiskanen stated that the bio-based resins are not expected to carry a significant price difference compared to fossil resins, particularly once bio-based platform chemicals are produced at scale, utilizing existing chemical industry production lines. The University of Oulu team tested composite panels made from the new bio-resins for 90 days in harbor conditions, exposing them to water, solar UV radiation, temperature fluctuations, and humidity to assess their durability.

The development of these resins aligns with a broader push for circular economy principles in materials engineering, offering a renewable feedstock that could redefine raw material supply chains. Finland’s abundant lignocellulose-based raw material base provides a strong foundation for the development of the bioeconomy, according to Puunvuoro, a Finnish forestry publication.

The University of Oulu researchers are continuing to refine the production process and explore further applications for the bio-based resins. No timeline has been announced for commercial availability.