Water Absorption in Caroá-Fiber Reinforced Polymer Composite at Different Temperatures: A Theoretical Investigation

Silva, C.J.; Lima, Antônio Gilson Barbosa de; Silva, E. Gomes da; Andrade, Tony Herbert Freire de; Melo, R.Q. da Costa

doi:10.4028/www.scientific.net/df.10.16

Cited by 6 publications

(4 citation statements)

References 15 publications

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“…The kinetics shows higher absorption of moisture at initial times of the process and for long timer exists a tendency to reach the equilibrium moisture content (saturation point). These results are consistent with those reported to polymer composites reinforced by other kind of vegetable fibers [15][16][17][18] .…”

Section: Water Absorption Kineticssupporting

confidence: 93%

Study of the Moisture Absorption in Polymer Composites Reinforced with Vegetal Fiber Using Langmuir’s Model

2019

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This work aims to numerically study the moisture absorption in polymer composites reinforced with vegetal fiber, using the diffusive model of Langmuir, which considers the existence of water molecules inside the material free to diffuse and adsorb at the capillaries walls, in the solid. A threedimensional and transient mathematical modelling to describe the water absorption process by the composite and its numerical solution via finite volume method are presented and discussed. Results of the free solute concentration, entrapped solute concentration, local moisture content and average moisture content obtained at different instants of the process are presented and analyzed. It was verified that the concentration gradients of the molecules (free and entrapped) are higher at the material surface. In addition, as the concentration of free water increases, there is also an increase in entrapped water concentration within the material at any time of the process.

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Section: Water Absorption Kineticssupporting

confidence: 93%

Study of the Moisture Absorption in Polymer Composites Reinforced with Vegetal Fiber Using Langmuir’s Model

2019

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“…Higher temperatures tend to accelerate the water diffusion behaviour. It is believed that the phenomenon is due to quicker movement of water molecules at higher temperature [21,22]. At high temperature, there is also a chance of breakage of the addition H-bonds created in the cellulosic network [23].…”

Section: Water Sorption Behaviourmentioning

confidence: 99%

A Study on Water Absorption and Mechanical Properties in Epoxy-Bamboo Laminate Composite with Varying Immersion Temperatures

Widiastuti¹,

Pratiwi²,

Cahyo³

2020

Open Engineering

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Bamboo laminate composites could be the alternative materials in outdoor application. However, the life time prediction of this composite in humid environment became a concern considering hydrophilic property of the bamboo fibre. This research aimed to assess the changes of mechanical properties in the composite with the sorption of water. It employed hand lay-up method in developing the laminate composites with epoxy as the matrix and woven bamboo as the reinforced material. Water sorption characteristic was evaluated through a gravimetric analysis for different water immersion temperatures. The sorption on water was studied by four weeks immersion in room temperature as well as in elevated temperatures of 50∘ and 80∘C. Tensile test was performed to evaluate the mechanical properties of the composite. This research clearly showed the significant effect of bamboo fibre on the strength and water sorption behaviour of the composites. It was observed that the rate of water absorption depends on temperature of immersion. Larger debonding between the bamboo fibre and the epoxy matrix was found in higher water immersion temperature. The results of this study emphasized the importance of considering the deterioration of mechanical properties in outdoor applications of bamboo composite highly exposed to high temperature and humidity

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“…Widespread and abundant as they are, these two plant species emerge as good candidates to produce cellulose whiskers for applications such as in reinforcements to polymer composites. Despite some studies carried out on the development of new composite materials based on these bers (Abd Halip et al 2019;Bezerra et al 2017;Bezerra et al 2016;Silva et al 2016), their cellulose nanocrystals still remains to be developed.…”

Section: Introductionmentioning

confidence: 99%

Extraction And Characterization Of Cellulose Whiskers From The Brazilian Semiarid Northeast: Caroá And Macambira Fibers

Macedo

Santos

Oliveira³

et al. 2022

Preprint

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Cellulose nanocrystals were successfully extracted from caroá (Neoglaziovia variegata) and macambira (Bromelia laciniosa) fibers, which are native plants from the semi-arid Caatinga biome in Northeastern Brazil. Fibers were submitted to alkaline and bleaching treatments prior to sulfuric acid extraction. Morphology and chemical composition (holocellulose and cellulose content) of fibers were determined by scanning electron microscopy and chemical analysis, respectively. Cellulose nanocrystal structure, crystallinity and thermal stability were determined respectively by atomic force microscopy and thermogravimetric analysis. Results show that mercerization followed by bleaching were able to remove waxes and amorphous regions. Caroá fibers required one mercerization and three bleaching steps while macambira needed one mercerization and two bleaching steps prior to nanocrystal extraction. Alkaline treated and bleached samples had lower thermal stability as compared to untreated fibers due to removal of lignin and increased surface area. Caroá and macambira are renewable sources of cellulose nanocrystals with potential applications as reinforcements to nanocomposites.

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Water Absorption in Caroá-Fiber Reinforced Polymer Composite at Different Temperatures: A Theoretical Investigation

Cited by 6 publications

References 15 publications

Study of the Moisture Absorption in Polymer Composites Reinforced with Vegetal Fiber Using Langmuir’s Model

Study of the Moisture Absorption in Polymer Composites Reinforced with Vegetal Fiber Using Langmuir’s Model

A Study on Water Absorption and Mechanical Properties in Epoxy-Bamboo Laminate Composite with Varying Immersion Temperatures

Extraction And Characterization Of Cellulose Whiskers From The Brazilian Semiarid Northeast: Caroá And Macambira Fibers

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