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Organic-inorganic composites based on magnesium phosphate cement and acrylic latexes: Role of functional groups
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SYSNO ASEP 0561894 Document Type J - Journal Article R&D Document Type Journal Article Subsidiary J Článek ve WOS Title Organic-inorganic composites based on magnesium phosphate cement and acrylic latexes: Role of functional groups Author(s) Zárybnická, Lucie (UTAM-F) RID, SAI, ORCID
Machotová, J. (CZ)
Mácová, Petra (UTAM-F) RID, SAI, ORCID
Viani, Alberto (UTAM-F) RID, ORCID, SAINumber of authors 4 Source Title Ceramics International. - : Elsevier - ISSN 0272-8842
Roč. 49, č. 3 (2023), s. 4523-4530Number of pages 8 s. Publication form Print - P Language eng - English Country GB - United Kingdom Keywords magnesium phosphate cement ; acrylic latex ; carboxyl groups ; emulsion polymerization OECD category Materials engineering R&D Projects GA20-01280S GA ČR - Czech Science Foundation (CSF) Method of publishing Limited access Institutional support UTAM-F - RVO:68378297 UT WOS 000907042000001 EID SCOPUS 85139313682 DOI 10.1016/j.ceramint.2022.09.338 Annotation The role of carboxyl functional groups in acrylic latex employed to fabricate an organic-inorganic composite material based on magnesium phosphate cement has been investigated. The acidic nature of the latex aqueous medium enhanced the dissolution of the magnesium oxide in the first stages of the cement reaction. The following increase in pH promoted the deprotonation of the carboxyl groups, which became involved in surface adsorption effects. Adsorption processes were found to control the nucleation and growth of the reaction products. The resulting overall hindering effect slowed down the reaction rates and delayed the precipitation of the solid phosphates with beneficial consequences, namely, the retardation of setting time and the modulation of the heat released. Modification in the morphology of the formed crystals, with the prevalence of platelet-like over prismatic habit, along with a decrease in their average size, was obtained. The crystals formed in higher amounts with respect to the neat cement because the reaction proceeds closer to equilibrium. The obtained microstructure is strengthened because of a more effective intermingling between crystals and the amorphous phase. Furthermore, the synergistic combination of polymer and phosphate cement improved the elastic properties, and
reduced the water absorption, impacting positively on the durability of the composite.Workplace Institute of Theoretical and Applied Mechanics Contact Kulawiecová Kateřina, kulawiecova@itam.cas.cz, Tel.: 225 443 285 Year of Publishing 2023 Electronic address https://doi.org/10.1016/j.ceramint.2022.09.338
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