Impact of water absorption on the creep performance of epoxy/microcrystalline cellulose composites
Recently, considerable effort has been made to study cellulose/epoxy compos-ites. However, there is a gap when it comes to understanding the post-conditioning anomalous effect of moisture uptake on their mechanical anddynamic-mechanical properties, and on their creep behavior. In this work, upto 10....
| Autores: | , , , , , , |
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| Formato: | artículo |
| Estado: | Versión publicada |
| Fecha de publicación: | 2024 |
| País: | Brasil |
| Recursos: | Universidade Federal do Rio Grande do Sul (UFRGS) |
| Repositorio: | Repositório Institucional da UFRGS |
| Idioma: | inglés |
| OAI Identifier: | oai:www.lume.ufrgs.br:10183/280866 |
| Acesso em linha: | http://hdl.handle.net/10183/280866 |
| Access Level: | acceso abierto |
| Palavra-chave: | Celulose microcristalina Resina epóxi Propriedades mecânicas dos materiais Cellulose and other wood products Mechanical properties Thermosets |
| Resumo: | Recently, considerable effort has been made to study cellulose/epoxy compos-ites. However, there is a gap when it comes to understanding the post-conditioning anomalous effect of moisture uptake on their mechanical anddynamic-mechanical properties, and on their creep behavior. In this work, upto 10.0 wt% microcrystalline cellulose (MCC) was incorporated into epoxyresin by simple mixing and sonication. Epoxy/MCC composites were fabri-cated by casting in rubber silicone molds, and rectangular and dog-bone testspecimens were produced. The moisture uptake, dynamic mechanical, chemi-cal, tensile, and creep behavior were evaluated. The incorporation of MCCincreased the water diffusion coefficient. The changes in storage modulus andglass transition temperature, combined with Fourier-transform infrared spec-troscopy analysis, evidenced that water sorption in epoxies causes both plasti-cization and additional resin crosslinking, although the latter is prevented bythe addition of MCC. The creep strain of the composites increased by 60% afterconditioning, indicating that plasticization induced by water sorption plays animportant role in the long-term properties of the composites. |
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