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Cross-examining Polyurethane Nanodomain Formation and Internal Structure

[Image: see text] Structural and morphological interplay between hard and soft phases determine the bulk properties of thermoplastic polyurethanes. Commonly employed techniques rely on different physical or chemical phenomena for characterizing the organization of domains, but detailed structural in...

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Detalles Bibliográficos
Autores principales: Terban, Maxwell W., Seidel, Karsten, Pöselt, Elmar, Malfois, Marc, Baumann, Roelf-Peter, Sander, Ralf, Paulus, Dirk, Hinrichsen, Bernd, Dinnebier, Robert E.
Formato: Online Artículo Texto
Lenguaje:English
Publicado: American Chemical Society 2020
Acceso en línea:https://www.ncbi.nlm.nih.gov/pmc/articles/PMC7594411/
https://www.ncbi.nlm.nih.gov/pubmed/33132420
http://dx.doi.org/10.1021/acs.macromol.0c01557
Descripción
Sumario:[Image: see text] Structural and morphological interplay between hard and soft phases determine the bulk properties of thermoplastic polyurethanes. Commonly employed techniques rely on different physical or chemical phenomena for characterizing the organization of domains, but detailed structural information can be difficult to derive. Here, total scattering pair distribution function (PDF) analysis is used to determine atomic-scale insights into the connectivity and molecular ordering and compared to the domain size and morphological characteristics measured by AFM, TEM, SAXS, WAXS, and solid-state NMR (1)H–(1)H spin-diffusion. In particular, density distribution functions are highlighted as a means to bridging the gap from the domain morphology to intradomain structural ordering. High real-space resolution PDFs are shown to provide a sensitive fingerprint for indexing aromatic, aliphatic, and polymerization-induced bonding characteristics, as well as the hard phase structure, and indicate that hard phases coexist in both ordered and disordered states.