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Morphology, micromechanical, and macromechanical properties of novel waterborne poly(urethane-urea)/silica nanocomposites
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SYSNO ASEP 0568974 Document Type J - Journal Article R&D Document Type Journal Article Subsidiary J Článek ve WOS Title Morphology, micromechanical, and macromechanical properties of novel waterborne poly(urethane-urea)/silica nanocomposites Author(s) Gajdošová, Veronika (UMCH-V) RID, ORCID
Špírková, Milena (UMCH-V) RID, ORCID
Aguilar Costumbre, Yareni (UMCH-V) ORCID
Krejčíková, Sabina (UMCH-V)
Strachota, Beata (UMCH-V) RID
Šlouf, Miroslav (UMCH-V) RID, ORCID
Strachota, Adam (UMCH-V) RID, ORCIDArticle number 1767 Source Title Materials. - : MDPI
Roč. 16, č. 5 (2023)Number of pages 26 s. Language eng - English Country CH - Switzerland Keywords mechanical properties ; microindentation ; polyurethanes Subject RIV CD - Macromolecular Chemistry OECD category Polymer science R&D Projects NU21-06-00084 GA MZd - Ministry of Health (MZ) Method of publishing Open access Institutional support UMCH-V - RVO:61389013 UT WOS 000946949300001 EID SCOPUS 85149875779 DOI 10.3390/ma16051767 Annotation Morphology, macro-, and micromechanical properties of novel poly(urethane-urea)/silica nanocomposites were analyzed by electron microscopy, dynamic mechanical thermal analysis, and microindentation. The studied nanocomposites were based on a poly(urethane-urea) (PUU) matrix filled by nanosilica, and were prepared from waterborne dispersions of PUU (latex) and SiO2. The loading of nano-SiO2 was varied between 0 (neat matrix) and 40 wt% in the dry nanocomposite. The prepared materials were all formally in the rubbery state at room temperature, but they displayed complex elastoviscoplastic behavior, spanning from stiffer elastomeric type to semi-glassy. Because of the employed rigid and highly uniform spherical nanofiller, the materials are of great interest for model microindentation studies. Additionally, because of the polycarbonate-type elastic chains of the PUU matrix, hydrogen bonding in the studied nanocomposites was expected to be rich and diverse, ranging from very strong to weak. In micro- and macromechanical tests, all the elasticity-related properties correlated very strongly. The relations among the properties that related to energy dissipation were complex, and were highly affected by the existence of hydrogen bonding of broadly varied strength, by the distribution patterns of the fine nanofiller, as well as by the eventual locally endured larger deformations during the tests, and the tendency of the materials to cold flow. Workplace Institute of Macromolecular Chemistry Contact Eva Čechová, cechova@imc.cas.cz ; Tel.: 296 809 358 Year of Publishing 2024 Electronic address https://www.mdpi.com/1996-1944/16/5/1767
Number of the records: 1