Moisture Absorption in Polymer Composites Reinforced with Vegetable Fiber: A Three-Dimensional Investigation via Langmuir Model

Autor: Francisca Valdeiza de Souza Tavares, Mirenia Kalina Teixeira de Brito, Wanessa Raphaella Gomes dos Santos, Antonio Gilson Barbosa de Lima, Robson Araújo de Queiroz, Balbina Raquel de Brito Correia, Guilherme Luiz de Oliveira Neto
Jazyk: angličtina
Rok vydání: 2019
Předmět:
Zdroj: Polymers
Volume 11
Issue 11
Polymers, Vol 11, Iss 11, p 1847 (2019)
ISSN: 2073-4360
DOI: 10.3390/polym11111847
Popis: This work aims to study numerically the moisture absorption in polymer composite reinforced with vegetable fibers using the Langmuir model which considers the existence of free and entrapped water molecules inside the material. A three-dimensional and transient modeling for describing the water absorption process inside the composite and its numerical solution via finite volume method were presented and discussed. Application has been made for polymer composites reinforced with sisal fiber. Emphasis was given to the effect of the layer thickness of fluid close to the wall of the composite in the progress of water migration. Results of the free and entrapped solute (water) concentration, local moisture content and average moisture content, at different times of process, and inside the composite were presented and analyzed. It was verified that concentration gradients of the molecules (free and entrapped) are higher in the material surface, at any time of the process, and concentration of free solute is greater than the concentration of entrapped solute. It was verified that the water layer thickness surrounding the composite strongly affects the moisture absorption rate.
Databáze: OpenAIRE
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