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    Thermosets from Highly Functionalized Bio-Based Resins

    發布日期:2019-07-18 23:10|瀏覽量:   來源:  

    題目:Thermosets from Highly Functionalized Bio-Based Resins

    主講嘉賓:Dean C. Webster教授(North Dakota State University)






    摘要: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 crosslinking 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. 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 such as citric or tartaric acids. Conversion of the epoxy groups into cyclic carbonate groups leads to highly functional resins that can be cured using multifunctional amines to yield polyurethanes without using isocyanates. Methacrylated and acrylated resins can also be cured with multifunctional amines via the Michael reaction. In all of these examples, the thermosets formed have properties far superior to their triglyceride oil counterparts and equivalent or superior to current petrochemical resins.