Supramolecular hierarchical polyurethane elastomers for thermal and mechanical property optimization

Lu, Ru-Qiang ; Concellón, Alberto (Universidad de Zaragoza) ; Wang, Pan ; Swager, Timothy M. ; Hsieh, Alex J.

Resumen: 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.

Idioma: Inglés

DOI: 10.1016/j.polymer.2022.125363

Año: 2022

Publicado en: Polymer 260 (2022), 125363 [11 pp.]
ISSN: 0032-3861

Factor impacto JCR: 4.6 (2022)

Categ. JCR: POLYMER SCIENCE rank: 18 / 85 = 0.212 (2022) - Q1 - T1

Factor impacto CITESCORE: 7.4 - Chemistry (Q1) - Materials Science (Q1)

Factor impacto SCIMAGO: 0.8 - Materials Chemistry (Q1) - Polymers and Plastics (Q1) - Organic Chemistry (Q1)

Tipo y forma: Artículo (PostPrint)

Área (Departamento): Área Química Orgánica (Dpto. Química Orgánica)