Lignin and soy flour as adhesive materials in the fabrication of<i>Rhizophora</i>spp. particleboard for medical physics applications

Zuber, Siti Hajar; Hashikin, Nurul Ab Aziz; Yusof, Mohd Fahmi Mohd; Hashim, Rokiah

doi:10.1080/00218464.2020.1839430

Cited by 10 publications

(13 citation statements)

References 30 publications

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“…Both condensed polyflavonoid tannins and hydrolysable tannins have already been successfully used as wood composite adhesives [22][23][24][25][26][27][28][29][30][31].…”

Section: Introductionmentioning

confidence: 99%

Natural Tannins as New Cross-Linking Materials for Soy-Based Adhesives

et al. 2021

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Human health problems and formaldehyde emission from wood-based composites are some of the major drawbacks of the traditional synthetic adhesives such as urea formaldehyde resins. There have been many attempts to decrease formaldehyde emission and replace urea formaldehyde resins with bio-based adhesives for wood-based composites. Because of some weakness in soy-based adhesive, chemicals have been used as modifiers. Modified soy-based adhesives without any formaldehyde have been successfully used to prepare wood panels. To achieve this, different synthetic cross-linking chemicals such as phenol formaldehyde resins and polyamidoamine-epichlorohydrin were used. However, in reality, what we need are totally green adhesives that use natural materials. In our previous research work, the use of tannins in combination with soy-based adhesives to make wood composites was investigated. Thus, in this research work, the feasibility of using three types of natural tannins (quebracho, mimosa and chestnut tannins) as cross-linking materials for soy adhesive was studied. The chemical bond formation and adhesion behaviors of tannin-modified soy adhesives were also investigated by Matrix-Assisted Laser Desorption/Ionization Time-of-Flight Mass Spectrometry (MALDI-ToF-MS) and thermo-mechanical analysis (TMA). The results showed that at ambient temperature, both ionic and covalent bonds formed between tannin constituents and amino acids; however, at higher temperature, covalent bonds are largely predominate. Based on the results obtained from the thermo-mechanical analysis, the modulus of elasticity (MOE) of soy adhesive is increased by adding tannins to its formulation. In addition, the chemical bond formation was proved by MALDI-ToF-MS.

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“…Both condensed polyflavonoid tannins and hydrolysable tannins have already been successfully used as wood composite adhesives [22][23][24][25][26][27][28][29][30][31].…”

Section: Introductionmentioning

confidence: 99%

Natural Tannins as New Cross-Linking Materials for Soy-Based Adhesives

et al. 2021

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“…The micrographs of the particleboards with different percentages of binders are depicted in Figure 7 , Figure 8 and Figure 9 . For the sample with 6% binders, the void spaces between the molecules were reduced when compared to the binderless sample, demonstrating a much smoother appearance which can be attributed to the hot pressing that allows the auto-condensation process between the wood particles and the binders, binding them together [ 7 ]. For the Rhizophora spp.…”

Section: Resultsmentioning

confidence: 99%

“…The mass degradation of Rhizophora spp., soy flour and lignin occurred at 303.35 °C, 236.11 °C and 279.64 °C, respectively, where the particles started to decompose at these temperatures. The mass degradation temperature should not be exceeded in the compression process of the particleboard, in order to improve the efficiency between the fibre chain of the particles and the binders [ 7 ]. The process of auto-condensation during the hot pressing had bound the molecules of the binders together with the Rhizophora spp.…”

Section: Resultsmentioning

confidence: 99%

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Influence of Different Percentages of Binders on the Physico-Mechanical Properties of Rhizophora spp. Particleboard as Natural-Based Tissue-Equivalent Phantom for Radiation Dosimetry Applications

et al. 2021

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Rhizophora spp. particleboard with the incorporation of lignin and soy flour as binders were fabricated and the influence of different percentages of lignin and soy flour (0%, 6% and 12%) on the physico-mechanical properties of the particleboard were studied. The samples were characterised by Fourier transform infrared spectroscopy (FTIR), X-ray diffraction (XRD), scanning electron microscopy (SEM), energy dispersive X-ray (EDX), X-ray fluorescence (XRF) and internal bonding. The results stipulated that the addition of binders in the fabrication of the particleboard did not change the functional groups according to the FTIR spectrum. For XRD, addition of binders did not reveal any major transformation within the composites. SEM and EDX analyses for all percentages of binders added showed no apparent disparity; however, it is important to note that the incorporation of binders allows better bonding between the molecules. In XRF analysis, lower percentage of chlorine in the adhesive-bonded samples may be advantageous in maintaining the natural properties of the particleboard. In internal bonding, increased internal bond strength in samples with binders may indicate better structural integrity and physico-mechanical strength. In conclusion, the incorporation of lignin and soy flour as binders may potentially strengthen and fortify the particleboard, thus, can be a reliable phantom in radiation dosimetry applications.

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“…La compresión forzada sobre las paredes celulares de las fibras durante el prensado en caliente aumenta la compacidad en el tablero y reduce la presencia de espacios vacíos que pudieran afectar sus propiedades físicas y mecánicas (Zuber et al, 2020).…”

Section: Aglomerados Sin Adhesivos Sintéticosunclassified

Elaboración de tableros aglomerados auto adheridos a partir de residuos agroindustriales

Garcia

Ruiz

2022

ICBI

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La mayoría de los aglomerados para la construcción utilizan resinas plásticas basadas en compuestos tóxicos que se aplican a espacios cerrados y disminuyen la calidad del aire interior, además de ser considerados cancerígenos. No obstante, la creciente demanda de estos materiales por la construcción tras la acelerada urbanización, así como el limitado recurso forestal del que se obtienen hacen que sea fundamental buscar otro tipo de alternativas más amigables con el medio ambiente. Bajo esta premisa, se tuvo como objetivo desarrollar un compuesto aglomerado auto adherido para su uso como tableros de muros divisorios interiores mediante el aprovechamiento del desecho agroindustrial de la industria del aceite de palma y fibras de coco. La conformación del aglomerado se realizó mediante un proceso de termo compresión que permitió el ablandamiento de la lignina, lo que sirvió de aglutinante para las fibras y les confirió de rigidez sin la necesidad de utilizar adhesivos sintéticos.

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Lignin and soy flour as adhesive materials in the fabrication ofRhizophoraspp. particleboard for medical physics applications

Cited by 10 publications

References 30 publications

Natural Tannins as New Cross-Linking Materials for Soy-Based Adhesives

Natural Tannins as New Cross-Linking Materials for Soy-Based Adhesives

Influence of Different Percentages of Binders on the Physico-Mechanical Properties of Rhizophora spp. Particleboard as Natural-Based Tissue-Equivalent Phantom for Radiation Dosimetry Applications

Elaboración de tableros aglomerados auto adheridos a partir de residuos agroindustriales

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