Dimensional stability and colour responses of Pinus elliottii wood subjected to furfurylation treatments

Acosta, Andrey Pereira; Schulz, Henrique Römer; Barbosa, Kelvin Techera; Zanol, Gustavo Spiering; Gallio, Ezequiel; Delucis, Rafael de Ávila; Gatto, Darci Alberto

doi:10.4067/s0718-221x2020005000305

Cited by 9 publications

(7 citation statements)

References 4 publications

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“…The treatments also induced an increase in both C and hº for both woods, except the hº of the pine wood, which remained approximately unaffected. This indicates that the treated woods presented more homogeneous colour patterns compared to the untreated ones (Acosta et al, 2020c). 3.6.…”

Section: Colour Changesmentioning

confidence: 87%

“…This is attributed to a change in the moisture desorption/absorption mechanisms since no macromolecules from the wood are degraded in this temperature range. Recent studies also reported an increase in thermal stability of wood parts treated by in situ polymerization (Acosta et al, 2020c;Xie et al, 2013).…”

Section: Thermal Decompositionmentioning

confidence: 93%

“…1B). These results can be attributed to the pine wood anatomy and its low specific gravity associated with the presence of long and wide tracheids prone to be filled with resin, which transversely communicate to each other by radial pits (Acosta et al, 2020c). For Pacheco et al (2020), the lumens of tracheids belonging to a pine wood are of variable diameter with an average of ≈30 μm.…”

Section: Treatment Parametersmentioning

confidence: 99%

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Improvement in mechanical, physical and biological properties of eucalyptus and pine woods by raw pine resin in situ polymerization

Acosta

Barbosa

Amico

et al. 2021

Industrial Crops and Products

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A raw pine resin, which is a cheap, renewable and easily obtainable forest resource, was used to impregnate two different fast-growing solid woods (Eucalyptus grandis Hill Maiden and Pinus elliottii Engelm) and in situ polymerized to improve their hygroscopic, chemical, morphological, mechanical, and thermogravimetric properties. Biodegradation resistance against subterranean termites and white-rot fungus was also addressed. The treatment yielded changes in colorimetric properties, dimensional stability and surface hydrophobicity. Compared to its respective untreated wood, the treated pine one presented increases within 40-50 % in ASE, whereas the treated eucalyptus wood showed negative values around -15 % in this same comparison. Increases in MOE (70 %) and MOR (50 %) were obtained for the pine wood, whereas the same properties were unaffected for the eucalyptus wood. Thermal and biological properties of both woods were also positively affected. These results were associated with the solidified raw pine resin inside the wood structure, which was confirmed by infrared spectroscopy and SEM images, especially for the pine due to its large and long tracheids, as well as its lignin content and overall composition.

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Section: Colour Changesmentioning

confidence: 87%

Section: Thermal Decompositionmentioning

confidence: 93%

Section: Treatment Parametersmentioning

confidence: 99%

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Improvement in mechanical, physical and biological properties of eucalyptus and pine woods by raw pine resin in situ polymerization

Acosta

Barbosa

Amico

et al. 2021

Industrial Crops and Products

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“…The infrared spectra of modified poplar veneers with different FA solutions and the control group were shown in Figure 7, and the characteristic peak assignments were Compared with the control group, the FA-modified veneer with CA as the catalyst improved the distortion of the cell wall, but the effect was not ideal (Figure 6f). Although part of the wood fiber lumens was filled, more cracks appeared in the intercellular layer, which can be explained by that using CA produced a more hydrophobic FA solution [43]. Therefore, FA molecules cannot fill the pores in the cellular structure.…”

Section: Ftir Analysismentioning

confidence: 99%

Sound Insulation Performance of Furfuryl Alcohol-Modified Poplar Veneer Used in Functional Plywood

2022

Materials

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Plywood has poor sound insulation due to its insufficient areal density, which cannot satisfy the demands of an indoor acoustic environment. This report proposed to use furfuryl alcohol to impregnate poplar veneer as a raw material for plywood and explored the sound insulation potential of furfuryl alcohol-modified poplar veneer. The effect of different formulations on the sound insulation performance of modified veneers was discussed, such as furfuryl alcohol concentrations, catalyst categories, and solvent categories. The weight percent gain (WPG) and areal density (AD) were used to evaluate the impregnation effectiveness of furfuryl alcohol modification. The sound insulation was measured by the impedance tube method. The results showed that the WPG of the furfuryl alcohol-modified veneers was evident, and the AD was effectively improved. Furthermore, the average sound insulation of furfuryl alcohol-modified poplar veneer was 25.68~40.10 dB, which increased by 10.8~19.1% compared with that of unmodified veneer. The modified veneer with 50% furfuryl alcohol concentration, taking isopropanol as a solvent, and maleic anhydride as a catalyst, had the optimal sound insulation performance. At the same time, the cell microstructure and chemical components were characterized by scanning electron microscope (SEM), Fourier-transform infrared spectroscopy (FTIR), and Brunauer–Emmett–Teller (BET) theory to explain the sound insulation mechanism further. The results showed that the distortion of cell walls was improved, suggesting a change in the mechanical properties of the cell wall. At the same time, more micropores formed since the filling of furfuryl alcohol resin, yielding a tortuous propagation pathway, so the sound insulation performance improved. Finally, it demonstrated the potential of furfuryl alcohol-modified poplar veneer as raw material to prepare plywood with excellent sound insulation.

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“…On the other hand, pine woods have low natural durability and low mechanical performance, especially those woods planted in tropical countries, like Brazil (Acosta et al 2020b). These woods are susceptible to be degraded by both biotic (including fungi, insects, and termites) and abiotic (like ultraviolet radiation, rain, and humidity) agents, which restrict their useful life (Aydemir et al 2016).…”

Section: Introductionmentioning

confidence: 99%

Flammability of a softwood impregnated with alumina nanoparticles

Gallio

Acosta

Delucis

et al. 2021

J Indian Acad Wood Sci

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Micro-and nanoparticles of aluminum oxide (alumina) have been used to confer increased flammability to polymers. In the present study, different weight fractions of alumina nanoparticles were impregnated into a traditional softwood and the flammability of these treated woods was studied. Sodium polyacrylate (SPAC) was used as a surfactant and also as a positive control. The influence of the treatment in physical (apparent density), mechanical (static bending and hardness), and thermal (flame retardancy and thermal stability tests) characteristics were evaluated. The presence of alumina nanoparticles in the wood ultrastructure was confirmed by means of SEM/EDS analyses. Compared to the untreated pine wood and that wood impregnated with neat SPAC, the impregnation of alumina contents within 0.3-0.5 wt% reduced the flame spreading of the studied pine woods. Also compared to the untreated wood, similar thermal and mechanical properties were achieved. The studied pine wood became less flammable with alumina impregnation, and there was no detrimental effects to its mechanical properties.

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Dimensional stability and colour responses of Pinus elliottii wood subjected to furfurylation treatments

Abstract: Projeto acadêmico sem fins lucrativos desenvolvido no âmbito da iniciativa Acesso Aberto Caracterização da cor da madeira de clones...

Cited by 9 publications

References 4 publications

Improvement in mechanical, physical and biological properties of eucalyptus and pine woods by raw pine resin in situ polymerization

Improvement in mechanical, physical and biological properties of eucalyptus and pine woods by raw pine resin in situ polymerization

Sound Insulation Performance of Furfuryl Alcohol-Modified Poplar Veneer Used in Functional Plywood

Flammability of a softwood impregnated with alumina nanoparticles

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