Moisture adsorption and desorption properties of some tropical woods

Eligon, Ann Marie; Achong, A.; Saunders, R.

doi:10.1007/bf01151818

Cited by 10 publications

(8 citation statements)

References 3 publications

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“…34 This could be the explanation for the similarity between the values of water absorption found among the species. Regarding the lower values of moisture absorption in C. odorata and G. arborea, these can be explained by the lower water absorption value of these two wood species, 47,48 which causes the scarce amount of water absorbed by these species.…”

Section: Water Absorptionmentioning

confidence: 99%

Effects of adding TiO2 nanoparticles to a water-based varnish for wood applied to nine tropical woods of Costa Rica exposed to natural and accelerated weathering

et al. 2016

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The addition of titanium dioxide nanoparticles (TiO 2 nanoparticles) to a water-based varnish used for finishing tropical woods was studied. Three different concentrations of TiO 2 nanoparticles (0%, 1.0%, and 1.5%) were evaluated. The nanoparticles were characterized by means of the transmission electron microscopy and an X-ray diffractometer. The varnish prepared was evaluated for its viscosity, adhesion of the film to the wood, water absorption, and the effects of natural weathering on the color and quality of the varnish. It was found that viscosity decreases as the concentration of TiO 2 nanoparticles increases, while no variation was found in the thickness of the film. Except for Gmelina arborea and Tectona grandis, the adhesion was not statistically affected. It was found that, in the 9 species tested, incorporation of TiO 2 nanoparticles decreased the values of water absorption. The evaluation of natural weathering showed that the varnish with no added TiO 2 nanoparticles degraded completely after 1 year of weathering exposure, while the modified varnish film endured. Less color change was observed in lumber treated with the varnish containing TiO 2 nanoparticles. The best performance of the varnish in the nine tropical woods used was observed when TiO 2 nanoparticles were added at 1.5% concentration.

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Section: Water Absorptionmentioning

confidence: 99%

Effects of adding TiO2 nanoparticles to a water-based varnish for wood applied to nine tropical woods of Costa Rica exposed to natural and accelerated weathering

et al. 2016

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“…It moisture readily when subjected to changes in relative humidity of the environment (RH). 4 Then, was crosslinked with styrene in a 60 : 40 weight ratio (resin : styrene). The initiator was benzoyl woodflour-reinforced polymers can take up a high amount of water, which generally causes a reducperoxide (Lucidol 0.75,Akzo Chemical S.A.) added in an amount of 1.5% wt with respect to tion in mechanical properties.…”

Section: Introductionmentioning

confidence: 99%

Dependence of the mechanical properties of woodflour-polymer composites on the moisture content

Marcovich

Reboredo

Aranguren

1998

J. Appl. Polym. Sci.

103

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Woodflour of Eucaliptus saligna with two different chemical treatments (mercerization and esterification with maleic anhydride) was used as filler of an unsaturated polyester matrix. Woodflour was treated to increase the interfacial adhesion with the matrix, to improve the dispersion of the particles, and to decrease the water sorption properties of the final composite. The objective of this study was to determine the influence of the moisture content and the woodflour chemical modification on the physical and mechanical properties of the different composites. Results indicated that mechanical properties (compression and bending tests) were severely affected by moisture and chemical modifications. In wet conditions, the composites made from treated woodflour had the lowest flexural modulus and ultimate stress. It was found that this was a reversible effect, because the original values of the compression properties were recovered after drying. Temperature scans in dynamic mechanical tests showed that an irreversible change occurred during exposure to humid environments, probably due to the hydrolysis of the polyester matrix. Essentially, the same behavior was observed for matrix and composites; however, a wood-related transition overlapped the main transition in the case of wet composites.

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“…The water uptake of fibers can be explained by various theories such as the surface adsorption theory, solid solution theory, capillary condensation theory, twophase mechanism, and the pore-size distribution mechanism [113]. However, the exact sorption kinetics as well as the moisture content depends on the species [114], the fiber extraction method, the exact wood constituents, the temperature, the mechanical stress, the previous history of the fibers [113], and on ambient conditions such as the pH, electrolyte concentration, and valency of the counter-ion [115]. Additionally, the swellability of fibers is affected by the charge (water retention values of *90 and 170% for charges of 50 and 125 leq/g, respectively, for hardwood pulp).…”

Section: Water Sorption Of Single Fibersmentioning

confidence: 99%

Factors affecting the hygroexpansion of paper

Lindner

2017

J Mater Sci

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Paper is a widely used packaging material and is nowadays regaining importance, e.g., as bio-based and biodegradable material. Moreover, new technologies such as polymer-fiber composites, printed electronics and the deep drawing of paper are developing. The process stability and also the resulting quality of paper converting processes such as coating, metallization, printing, and the printing of electronics are highly affected by the hygroexpansion of paper. In order to reduce production instability and to choose and develop paper substrates with ideal characteristics, critical parameters need to be known. This paper offers an extensive overview of those parameters, starting at a molecular and microscopic level with the effect of the constituents and morphology of single fibers, before moving on to paper contents, chemical modifications and additives and finally concluding with paper production and fiber network modification. It was found that the major influences are single fiber sorption, inter-fiber contacts, microfibril angle, fiber morphology (length, width, curliness) and fiber orientation. This review gives new ideas and insights for technologists working in research, development and production optimization of paper-based products.

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Moisture adsorption and desorption properties of some tropical woods

Cited by 10 publications

References 3 publications

Effects of adding TiO2 nanoparticles to a water-based varnish for wood applied to nine tropical woods of Costa Rica exposed to natural and accelerated weathering

Effects of adding TiO2 nanoparticles to a water-based varnish for wood applied to nine tropical woods of Costa Rica exposed to natural and accelerated weathering

Dependence of the mechanical properties of woodflour-polymer composites on the moisture content

Factors affecting the hygroexpansion of paper

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