132109 20240319081009.0 doi 10.1016/j.polymer.2022.125363 sideral 131572 ART-2022-131572 eng Lu, Ru-Qiang Supramolecular hierarchical polyurethane elastomers for thermal and mechanical property optimization 2022 Access copy available to the general public Unrestricted Supramolecular chemical designs that integrate complementary hydrogen bond donor and acceptor complexes in hierarchical polyurethane elastomers are reported. N2,N6-bis(2-hydroxyethyl)pyridine-2,6-dicarboxamide (PDA) and 5,5-bis(3-hydroxypropyl)barbituric acid (BBA) react with 4,4'-methylenediphenyl diisocyanate (MDI) to produce hard segments capable of multiple intermolecular hydrogen bonds in MDI-PDA/BBA-poly(tetramethylene oxide) (PTMO) polyurethanes. The addition of PDA facilitates the formation of a supramolecular complex, and BBA affords greater intersegmental mixing. As a result, these polyurethanes exhibit higher glass transition temperatures (Tg) and greater strain hardening/strengthening under tensile deformation than a microphase-separated MDI-butanediol (BDO)-PTMO analog. Additionally, increased PDA and BBA contents results in up to a 60 °C increase of Tg determined at 1 Hz via DMA relative to those determined by calorimetric measurements via DSC, which is considerably higher than the 15 °C Tg increase observed in the MDI-BDO-PTMO analog. These results highlight a significant interplay between intersegmental mixing and supramolecular hydrogen bond interactions for the design of robust hierarchical elastomers. info:eu-repo/semantics/openAccess by-nc-nd http://creativecommons.org/licenses/by-nc-nd/3.0/es/ 4.6 2022 POLYMER SCIENCE 18 / 85 = 0.212 2022 Q1 T1 0.8 2022 Materials Chemistry 2022 Q1 Polymers and Plastics 2022 Q1 Organic Chemistry 2022 Q1 7.4 2022 info:eu-repo/semantics/article info:eu-repo/semantics/acceptedVersion Concellón, Alberto Universidad de Zaragoza (orcid)0000-0002-8932-9085 Wang, Pan Swager, Timothy M. Hsieh, Alex J. 2013 765 Universidad de Zaragoza Dpto. Química Orgánica Área Química Orgánica 260 (2022), 125363 [11 pp.] Polymer Polymer 0032-3861 2421109 http://zaguan.unizar.es/record/132109/files/texto_completo.pdf Postprint 1587776 http://zaguan.unizar.es/record/132109/files/texto_completo.jpg?subformat=icon icon Postprint oai:zaguan.unizar.es:132109 articulos driver 2024-03-18-14:56:44 ARTICLE