Abstract
Due to reasons of sustainability and conservation of resources, polyurethane (PU)-based systems with preferably neutral carbon footprints are in increased focus of research and development. The proper design and development of bio-based polyols are of particular interest since such polyols may have special property profiles that allow the novel products to enter new applications. Sophorolipids (SL) represent a bio-based toolbox for polyol building blocks to yield diverse chemical products. For a reasonable evaluation of the potential for PU chemistry, however, further investigations in terms of synthesis, derivatization, reproducibility, and reactivity towards isocyanates are required. It was demonstrated that SL can act as crosslinker or as plasticizer in PU systems depending on employed stoichiometry. (ω-1)-hydroxyl fatty acids can be derived from SL and converted successively to polyester polyols and PU. Additionally, (ω-1)-hydroxyl fatty acid azides can be prepared indirectly from SL and converted to A/B type PU by Curtius rearrangement.
Highlights
Mendiguren, Lorena Ugarte andThe main components of well-known and very versatile polyurethanes (PU) [1,2]are polyisocyanates and polyols [3,4]
Considering the need for a sustainable economic activity [9], the development of polyols based on renewable resources and the research on their applicability for PU systems are of increased significance [10,11,12,13,14,15,16,17,18]
Among bio-based polyol platforms, sophorolipids (SL) are well documented and show high potential to provide a versatile toolbox for polyol building blocks [19,20,21,22,23,24,25,26]
Summary
Are polyisocyanates and polyols [3,4]. The morphology and the properties of PU are mainly determined by the intrinsic structure of the polyol component(s) since their content exceeds typically 60 wt.% of the PU [5,6,7]. SL are suited internal emulsifier in PU potential reaction sitesbuilding with different toward NCO groups andasshould technology because of their amphiphilic nature [47,48,49]. SL are suited as internal emulsifier in PU dispersion technology because of polyolsnature or directly to PU [17,50,51,52] For such HFA is that the OH group is localtheir amphiphilic [47,48,49]. HFA form renewable resources like castor oil,resultant which can be converted polyester contain dangling chains that reduce crystallinity and glass transition temperature [52,53]. We demonstrate the fundamental access to A/B type PU systems by applying Curtius rearrangement on (ω-1) HFA azides obtained from LSL, confirming the Curtius approach to A/B type PU systems of other groups [51,64,65,66,67,68,69]
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