Dimensional stabilization of wood by chemical modification using isopropenyl acetate

Giridhar, B.N.; Pandey, Krishna K.; Prasad, Basheshar; Bisht, Surendra Singh; Vagdevi, H. M.

doi:10.4067/s0718-221x2017005000002

Cited by 10 publications

(8 citation statements)

References 11 publications

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“…En el mismo sentido, la disminución en la magnitud de la higroexpansión en la madera como efecto del tratamiento con sales de boro es interpretado por el bloqueo de los lúmenes celulares por cristales de boro y por la alteración de los componentes químicos presentes en la pared celular. Otros factores son la especie, el contenido de humedad y densidad de la madera en estudio (Hernández, 2007;Islam et al, 2012;Qian et al, 2019;Kocaefe et al, 2015;Sargent, 2019); la concentración, retención y clase de las sustancias de impregnación, (Temiz et al, 2008;Lesar et al, 2011;Qian et al, 2013;Petr y Aleš, 2014;González-Laredo et al, 2015;Giridhar et al, 2017;Qian et al, 2018;He et al, 2019); así como los tiempos, presiones y temperaturas aplicados en los procesos (Esteves y Pereira, 2009;Caldeira, 2010;Soltani et al, 2013;Gérardin, 2016;Fu et al, 2019). Como resultado, la biodiversidad de especies, reflejada en densidades y en estructuras anatómicas y en planos leñosos particulares a cada especie, árbol y tipo de tejido, así como las diferentes perspectivas experimentales, repercuten en una amplia variabilidad en los parámetros de higroscopía que caracterizan a una madera.…”

Section: Higroexpansionesunclassified

“…Caso especial es S. campanulata, madera con densidad básica muy baja (ρ 0 = 269 kg m-3) cuyo índice de antihigroexpansión es de 63%, el más alto. Si bien las magnitudes son comparables a las reportadas en la bibliografía por Dubey et al, (2011);Islam et al, (2012); Qian et al, (2013); Soltani et al, (2013); Jiang et al, (2015) y Giridhar et al (2017), la correlación de estos datos con las densidades es baja: I A = 0,073 ρ 0 + 4,7 (R² = 0,21).…”

Section: Coeficientes De Higroexpansiónunclassified

“…Sin embargo, para homogeneizar resultados con respecto a la variación del contenido de humedad, es conveniente determinar los coeficientes de higroexpansión, los cuales ponderan la variación geométrica por el incremento en el contenido de humedad (Torelli y Gorišek, 1995;Lesar et al, 2011). Para fines de valoración del efecto de un proceso de estabilización dimensional, se utiliza el índice de antihigroexpansión, que contrasta los estados de la madera antes y después del tratamiento de humectación (Dubey et al, 2011;Islam et al, 2012;Soltani et al, 2013;Qian et al 2013;Jiang et al, 2015;Giridhar et al, 2017, Qian et al, 2018. En el mismo contexto, la relación de anisotropía es el parámetro que califica la estabilidad dimensional respecto a sus ejes tangencial y radial (Hernández, 2007;Shukla y Kandem, 2010).…”

Section: Introductionunclassified

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Características higroscópicas de las maderas Spathodea campanulata, Fraxinus americana y Albizia plurijuga impregnadas con boro

Sotomayor-Castellanos

Ávila-Calderón

2021

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El objetivo de la investigación fue evaluar si el impregnado de la madera con sales de boro reduce su higroscopicidad y mejora su estabilidad dimensional. En probetas de pequeñas dimensiones de madera de Spathodea campanulata, Fraxinus americana y Albizia plurijuga se aplicó un tratamiento caliente-frío de sales de boro con una concentración de 3%. Se realizaron pruebas de higroscopía y tanto antes como después del impregnado con sales de boro, se analizó la densidad básica, contenido de humedad, higroexpansiones radial, tangencial, longitudinal y volumétrica, puntos de saturación de la fibra, coeficientes de higroexpansión, índice de antiexpansión y relación de anisotropía. Después del baño, las características higroscópicas se modificaron según las especies y las direcciones observadas. El tratamiento mejora la estabilidad dimensional de S. campanulata en 63%, de F. americana en 21% y para A. plurijuga en 18%. Es recomendable investigar la influencia de las características anatómicas sobre las propiedades higroscópicas de estas especies.

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Section: Higroexpansionesunclassified

Section: Coeficientes De Higroexpansiónunclassified

Section: Introductionunclassified

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Características higroscópicas de las maderas Spathodea campanulata, Fraxinus americana y Albizia plurijuga impregnadas con boro

Sotomayor-Castellanos

Ávila-Calderón

2021

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“…(Dong et al 2016;Wei et al 2018). The bamboo can be chemically modified, which changes its characteristics (Giridhar et al 2017). The xylan extracted from corncobs was used to treat bamboo in order to improve its dimensional stability in this work.…”

Section: Introductionmentioning

confidence: 99%

Dimensional stability of lotus leaf-like nanostructure superhydrophobic bamboo by modification using xylan

Gao

Jiang

et al. 2020

BioRes

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Xylan extracted from corncobs was used to modify bamboo and to improve its dimensional stability. A lotus leaf-like surface was prepared on the modified bamboo using a fresh lotus leaf and polydimethylsiloxane (PDMS) as the template and seal via soft lithography. The dimensional stability of bamboo was tested via anti-shrinkage efficiency (ASE), moisture excluding efficiency (MEE), weight percent gain (WPG), and its superhydrophobic property. The microstructures of lotus-like bamboo surface were analyzed via water contact angle (WCA), scanning electron microscopy, and atomic force microscopy (AFM). The study found that with increasing mass fraction of xylan content, the anti-swelling property and WPG of modified bamboo increased accordingly. When the mass fraction of xylan was 10%, its WPG was the largest (2.21%), and xylan had a better compatibilization effect on bamboo. The dimensional stability of bamboo was improved to a certain extent by xylan. Moreover, the anisotropy and superhydrophobicity of the lotus leaf-like bamboo treated by xylan were noticeably improved after modification, such that the WCA of the transverse, radial, and tangential sections were 157.5º, 145.5º, and 137.5º, respectively. This research lays a foundation for studies of dimensional stability of bamboo and the mechanism of modification to achieve hydrophobic properties.

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“…Hemicelluloses, accessible or non-crystalline cellulose, and lignin are mainly responsible for moisture uptake [3,5]. In these polymers, free hydroxyl groups (OH − anions) adsorb and release water depending on the changes in temperature and relative humidity causing cell walls-and all of the structure of wood-to adjust to the presence (or absence) of other OH − anions, such as those of water, thus giving way to changes in dimensional stability of wood, or to potential biological attacks by fungi [1,3,6].…”

Section: Introductionmentioning

confidence: 99%

Acetylation of tropical hardwood species from forest plantations in Costa Rica: an FTIR spectroscopic analysis

et al. 2020

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Acetylation of softwoods has been largely investigated to increase the dimensional stability and biological resistance of wood. However, the knowledge of this technology has not been applied to tropical hardwood species up to date. The objective of this work was to study the effect of acetylation on nine tropical hardwood species, from forest plantations in Costa Rica, by applying acetic anhydride in three different treatment times (1 h, 2.5 h, 4 h), as well as to evaluate this by Fourier-Transform Infrared Spectroscopy (FTIR). Results showed that weight percentage gain (WPG) of wood varied from 2.2 to 16.8%, with Vochysia ferruginea species showing the highest WPG, and Gmelina arborea and Tectona grandis species exhibiting the lowest WPGs. Tropical woods such as Enterolobium cyclocarpum, Hieronyma alchorneoides and Samanea saman exhibited statistical differences among treatment times, whereas the rest of the species studied showed no significant differences. In general, the most effective acetylation time was 2.5 h for all the species. The ratio of intensity (RI) from the FTIR spectra was greater at the 1732 cm −1 , 1372 cm −1 and 1228 cm −1 peaks for all tropical species, associated with lignin. A good correlation between the RI of those peaks and WPG was found; the same was also found between all RIs and each other. Meanwhile, RI associated to the hemicelluloses and lignin (1592 cm −1 and 1034 cm −1 peaks, respectively) showed no correlation with WPG, nor between each other or with the other RIs. Furthermore, it was suggested that RI at 1732 cm −1 (associated to acetyl groups C=O) can be considered as a reliable indicator of the degree of acetylation for tropical hardwood species. Finally, it was observed that tropical hardwoods having more suitable anatomical features, like larger vessel diameter, higher ray width and frequency, and lesser deposits such as gums and tyloses in the vessels, resulted in significantly higher WPGs.

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Dimensional stabilization of wood by chemical modification using isopropenyl acetate

Cited by 10 publications

References 11 publications

Características higroscópicas de las maderas Spathodea campanulata, Fraxinus americana y Albizia plurijuga impregnadas con boro

Características higroscópicas de las maderas Spathodea campanulata, Fraxinus americana y Albizia plurijuga impregnadas con boro

Dimensional stability of lotus leaf-like nanostructure superhydrophobic bamboo by modification using xylan

Acetylation of tropical hardwood species from forest plantations in Costa Rica: an FTIR spectroscopic analysis

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