Ring-opening copolymerisation with a xylose derived oxetane Ella Clark , Matthew G. Davidson, Antoine Buchard Univeristy of Bath, UK Sugar derived polymers are an attractive alternative to fossil derived plastics due to their abundance, sustainability and high functionality. The ring-opening copolymerisation (ROCOP) of bio-derived monomer has been widely reported and can produce multiple polymer types, architectures and functionalities by simple variation of monomers and initiators. 1,2 Although epoxide ROCOP is a well-established field, for many other potential monomers, such as oxetanes, development is in the early stages. Our group has recently reported the ROCOP of an oxetane co-monomer (d-Ox), derived from d-xylose, with cyclic anhydrides and CS 2 . 3,4 This poster will detail the investigation of catalysis of d-Ox ROCOP with cyclic anhydrides and isothiocyanates. With cyclic anhydrides, three catalyst systems were found to outperform the reported existing Cr(III) Salen catalyst, an Al(III) and Fe (III)aminotris(phenolate)s and an Al(III) porphyrin complex. These were then applied to the ROCOP of d-Ox and four aromatic isothiocyanates producing thermally robust polymers ( T d,5% >228 °C) with a range of high glass-transition temperatures (76−132 °C). 5 A complete switch in selectivity over the thioimidocarbonate/thionourethane linkages was achieved by varying the catalyst systems. Block copolymer synthesis was possible by initiation from difunctional PEG and exploiting the living character of the ROCOP process allowing chain-extension by the ring-opening polymerisation (ROP) of lactide. Degradation under acidic and basic conditions and photodegradation was demonstrated. References
1. Chem. Commun. , 2015, 51 , 6459-6479 2. Angew.Chem.Int. Ed.2022,61,e202104495 3. Polym. Chem., 2021 , 12 , 4253-4261. 4. Macromolecules, 2021 , 54 , 5094-5105. 5. Polym. Chem. , 2023, 14 , 2838-2847.
P10
© The Author(s), 2023
Made with FlippingBook Learn more on our blog