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Impact of water absorption on the creep performance of epoxy/microcrystalline cellulose composites
Luleå University of Technology, Department of Engineering Sciences and Mathematics, Material Science. Department of Materials, Federal University of Rio Grande do Sul–UFRGS, Porto Alegre, RS, Brazil.ORCID iD: 0000-0001-9208-8764
Luleå University of Technology, Department of Engineering Sciences and Mathematics, Material Science. Department of Materials, Federal University of Rio Grande do Sul–UFRGS, Porto Alegre, RS, Brazil.ORCID iD: 0000-0001-7493-8163
Department of Materials, Federal University of Rio Grande do Sul–UFRGS, Porto Alegre, RS, Brazil.
Luleå University of Technology, Department of Engineering Sciences and Mathematics, Material Science.ORCID iD: 0000-0001-5550-2962
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2024 (English)In: Journal of Applied Polymer Science, ISSN 0021-8995, E-ISSN 1097-4628, Vol. 141, no 19, article id e55365Article in journal (Refereed) Published
Abstract [en]

Recently, considerable effort has been made to study cellulose/epoxy composites. However, there is a gap when it comes to understanding the post-conditioning anomalous effect of moisture uptake on their mechanical and dynamic-mechanical properties, and on their creep behavior. In this work, up to 10.0 wt% microcrystalline cellulose (MCC) was incorporated into epoxy resin by simple mixing and sonication. Epoxy/MCC composites were fabricated by casting in rubber silicone molds, and rectangular and dog-bone test specimens were produced. The moisture uptake, dynamic mechanical, chemical, tensile, and creep behavior were evaluated. The incorporation of MCC increased the water diffusion coefficient. The changes in storage modulus and glass transition temperature, combined with Fourier-transform infrared spectroscopy analysis, evidenced that water sorption in epoxies causes both plasticization and additional resin crosslinking, although the latter is prevented by the addition of MCC. The creep strain of the composites increased by 60% after conditioning, indicating that plasticization induced by water sorption plays an important role in the long-term properties of the composites.

Place, publisher, year, edition, pages
Wiley , 2024. Vol. 141, no 19, article id e55365
Keywords [en]
cellulose and other wood products, mechanical properties, thermosets
National Category
Polymer Chemistry
Research subject
Polymeric Composite Materials
Identifiers
URN: urn:nbn:se:ltu:diva-104592DOI: 10.1002/app.55365ISI: 001173034400001Scopus ID: 2-s2.0-85186558212OAI: oai:DiVA.org:ltu-104592DiVA, id: diva2:1844554
Note

Validerad;2024;Nivå 2;2024-04-09 (joosat);

Funder: The Brazilian Agency Coordenação de Aperfeiçoamento de Pessoal de Nível Superior (CAPES, Brazil) Finance Code 001; STINT/CAPES (no. 88881.304743/2018-01); Conselho Nacional de Desenvolvimento Científico e Tecnológico (CNPq, Brazil) (grants no. 408193/2021-2 and 305814/2021-4);

Full text license: CC BY

Available from: 2024-03-14 Created: 2024-03-14 Last updated: 2024-04-09Bibliographically approved

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Lavoratti, AlessandraBianchi, OtávioAl-Maqdasi, ZainabVarna, JanisJoffe, Roberts

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