2026-04-27T21:41:16Zhttps://uvadoc.uva.es/oai/request

oai:uvadoc.uva.es:10324/727762025-03-26T19:10:04Zcom_10324_1157com_10324_931com_10324_894col_10324_1298

Tena Matias, Alberto Rangou, Sofia Shishatskiy, Sergey Filiz, Volkan Abetz, Volker 2024-12-18T12:41:14Z 2024-12-18T12:41:14Z 2016 Sci. Adv. 2016; 2 : e1501859 https://uvadoc.uva.es/handle/10324/72776 10.1126/sciadv.1501859 Producción Científica Thermally rearranged (TR) polymers, which are considered the next-generation of membrane materials because of their excellent transport properties and high thermal and chemical stability, are proven to have significant drawbacks because of the high temperature required for the rearrangement and low degree of conversion during this process. We demonstrate that using a [3,3]-sigmatropic rearrangement, the temperature required for the rearrangement of a solid glassy polymer was reduced by 200°C. Conversions of functionalized polyimide to polybenzoxazole of more than 97% were achieved. These highly mechanically stable polymers were almost five times more permeable and had more than two times higher degrees of conversion than the reference polymer treated under the same conditions. Properties of these second-generation TR polymers provide the possibility of preparing efficient polymer membranes in a form of, for example, thin-film composite membranes for various gas and liquid membrane separation applications. HelmholtzAssociation of German Research Centers through the Helmholtz Portfolio MEM-BRAIN. application/pdf eng American Association for the Advancement of Science info:eu-repo/semantics/openAccess http://creativecommons.org/licenses/by-nc-nd/4.0/ Attribution-NonCommercial-NoDerivatives 4.0 Internacional Claisen thermally rearranged (CTR) polymers info:eu-repo/semantics/article info:eu-repo/semantics/publishedVersion SI