Dean C. Webster
North Dakota State University, USA
Title: Bio-based thermosets from star-like highly functional reactive resins
Biography
Biography: Dean C. Webster
Abstract
A challenge faced with transitioning from polymer materials derived from petrochemical sources to bio-based sources is in designing materials having the performance properties required for today’s applications. High performance thermoset polymers are used in applications such as coatings, composites, and adhesives and are made in-situ from the reactions of functional low molecular weight resins or functional oligomers. While vegetable oils are a readily available and amenable to functionalization to be used in thermosets, their long aliphatic hydrocarbon chains tend to result in materials that are soft and flexible. However, we have found that by creating multifunctional resins from vegetable oil fatty acids and a highly functional polyol, thermosets can be formed that have the strength and stiffness for use in high performance coatings and composites. For example, epoxidized sucrose esters crosslinked with cyclic anhydrides yield thermosets having modulus values exceeding 1 GPa. Polyurethanes made using highly functional soy polyols have glass transition temperatures exceeding 100 °C, much higher than typical soy-based polyols. Methacrylated sucrose esters can be used to form high performance composites using either glass or natural fibers. It has also been discovered that 100% bio-based thermosets can be made from the water-catalyzed crosslinking of epoxidized sucrose soyate with naturally-occurring acids.