Chemical composition of some plantation wood species (Eucalyptus saligna, Cupressus lusitanica and Eucalyptus paniculata) and assessment of compatibility with plaster

Youmssi, David Vernon Chokouadeu; Bampel, Yves Didier Modtegue; Njankouo, Jacques Michel; Tchinda, Jean-Bosco Saha; Ndikontar, Maurice Kor

doi:10.1007/s13196-017-0200-3

Cited by 10 publications

(9 citation statements)

References 16 publications

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Section: Resultscontrasting

confidence: 72%

“…The hemicellulose content of MMKW is 10.3 wt%, which is 1.63 and 1.20 times lower than that of MMB (16.8 wt%) and MMK (12.4 wt%), respectively. These lower values than those reported in the literature, such as Cupressus lusitanica 17 Triumpheta C. 41 indicate weak binding between lignin and cellulose in these fibres. This weak bonding could be an advantage for reducing the mechanical extraction energy of cellulose microfibres and nanofibres 42,43 which are a new attraction for the development of environmentally friendly textiles, films and foams.…”

Section: Chemical Compositioncontrasting

confidence: 71%

“…The pores in gypsum plaster are formed during the hydration of the plaster and give the material its lightness and good thermal and acoustic insulation properties. 17 Air bubbles are also found in the structure of gypsum plaster, which constitute stress concentration zones, leading to catastrophic failure of the plaster by disentanglement and fracture of gypsum crystals. 18,19 The addition of fibrous reinforcements improves the ductility and durability of the gypsum.…”

Section: Introductionmentioning

confidence: 99%

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Extraction and characterization of a novel tropical fibre Megaphrynium macrostachyum as a biosourced reinforcement for gypsum-based biocomposites

Betené,

Batoum,

Ndoumou Belinga

et al. 2023

Journal of Composite Materials

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Identifying the potential of new bast fibres is a solution for diversifying biobased reinforcements and replacing environmentally harmful synthetic fibres. In this study, fibres were extracted from Megaphrynium macrostachyum stems by biological and chemical retting. The chemical fibres were bleached with a 2.5wt% sodium hypochlorite (NaClO) solution. The biological, chemical and bleached fibres were analysed from a chemical, morphological, physical, mechanical and thermal point of view. The possibility of using these fibres as reinforcement in gypsum-based biocomposites for construction was analysed by three-point bending tests. Chemical analysis revealed a cellulose content of more than 56 wt% within the usual range (50-85 wt%) for reinforcing fibres. SEM images showed that bleaching cleans the surface of the fibres. Physical analysis by gravimetric analysis showed that the bleached fibre had the lowest density (1.01 g.cm−3), fineness (5.2tex) and water absorption (64wt%). In addition, the highest thermal stability (237°C) was obtained for the chemical fibre. Young’s modulus and tensile strength, evaluated according to ASTM D3822-07, were dispersed and depended on the fibre diameter, and the highest values were obtained for the chemical fibre (6.4 GPa and 251 MPa). In contrast, gypsum composites with a volume fraction of 1.5% bleached chemical fibre had the highest stiffness (258 MPa) and flexural strength (5 MPa). The results obtained for each fibre type are relatively close to those of other fibres in the literature, indicating that all three fibre types studied can be used as alternative raw materials for the manufacture of gypsum-based biocomposites.

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Section: Resultscontrasting

confidence: 72%

Section: Chemical Compositioncontrasting

confidence: 71%

Section: Introductionmentioning

confidence: 99%

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Extraction and characterization of a novel tropical fibre Megaphrynium macrostachyum as a biosourced reinforcement for gypsum-based biocomposites

Betené,

Batoum,

Ndoumou Belinga

et al. 2023

Journal of Composite Materials

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“…Leaching can extract non-fixed preservatives, but also some extractives naturally present in wood. The extractive contents (ethanol-toluene and hot water) obtained from those wood species were 3.4% for Ayous (non-published research work) and 5.0% for Sydney blue gum (Chokouadeu Youmssi et al, 2017). The PWLL obtained for almost all the treatments was higher than the extractive content Mbitnkeu Fetnga Tchebe, T., Saha Tchinda, J.-B., Ngueteu Kamlo, A., Chimeni Yomeni, D., Cheumani Yona, A. M., & Ndikontar Kor, M.: Ocena učinkovitosti nimovega olja (Azadirachta indica) ter baker-etanolaminskih pripravkov pri zaščiti lesa pred napadom podzemnega termita of the woods and showed that Neem oil as well as copper-ethanolamine were both leached.…”

Section: Leaching Izpiranjementioning

confidence: 90%

Efficiency evaluation of Neem (Azadirachta indica) oil and copper-ethanolamine in the protection of wood against a subterranean termite attack

Tchebe¹,

Tchinda²,

Kamlo³

et al. 2020

les-wood

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The demand for environmentally safe preservatives for wood is increasing all around the world. This study is focused on the evaluation of the ability of Neem (Azadirachta indica) seed oil and copper-ethanolamine to protect Sydney blue gum (Eucalyptus saligna) and Ayous (Triplochiton scleroxylon) against termites. Wood blocks were impregnated with solutions of Neem oil in acetone and/or an aqueous solution of copper-ethanolamine. Impregnated woods with a retention rate of up to 108.3 kg/m3 were obtained. A leaching experiment was used to determine the fixation of preservatives in wood. The termicidial effect of the preservatives was studied through exposure in a termitarium. Neem oil was less efficient for Sydney blue gum but showed significant protection for Ayous at a higher retention rate. At the concentration investigated, the treatment of both wood species with copper-ethanolamine solution was not suitable. However, a combination of copper-ethanolamine and Neem oil showed an improvement in the protection of Sydney blue gum wood. Nevertheless, the impregnated woods still suffered an increased termite attack after leaching.

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“…Residue II was retained by filtration, and it was washed with distilled water and dried in the oven at 150 0 C until dried and its weight was recorded after cooling. The Pectin content was determined using the following formulae [14].…”

Section: Quantitative Analysis Of Fibres' Constituents I Ethanol-benz...mentioning

confidence: 99%

Extraction, Treatment and Characterization of Banana Pseudo-Stem Fibers as Potential Utility in Textile Industry

Rukundo

2024

IDOSR JBBAF

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Extraction, treatment and characterization of banana pseudo stem fibres was achieved. The study revealed that water retting is the best way to extract fibers, however the gummy materials bending fibres together must be weakened by boiling the fibres rich material prior to retting where the fibres were able to be extracted at 14th day of retting. The fibers were treated using NaOH for scouring while bleaching was carried out using H2O2. The treatment of fibers was conducted to get rid of fat, wax and other impurities as well as undesired colors bonded to fibers that could not be removed through water retting. The best scouring concentration of NaOH was found to be 17.5 % while the best bleaching concentration of H2O2 was found to be 2 %. More so, FTIR was carried out for both treated and untreated fibers and it was shown that wax, fat and other impurities can be removed by fibres’ scouring and bleaching. This was further confirmed by the use of Soxhlet to extract ethanol-benzene extract from both treated and untreated fibres, where untreated fibres showed a considerable weight loss while the treated fibers did not show any weight loss. Thereafter, mercerization was carried out and it was found out that the best mercerization concentration of NaOH is 15%. Furthermore, the quantitative analysis of the banana pseudo-stem fibers revealed that the fibers have, ethanol-benzene extractives of 4.2 %, pectin content of 3.07%, Lignin content of 18%, cellulose content of 68.3% and ash content of 4.2 %. The fibers showed a water, oil and vapor absorption of 71%,59 % and 8% respectively. Also, the thermal analysis showed that the degradation temperature is 370 0C while the fibers started to display thermal instability at 290 0C. Moreover, SEM and XRD analysis showed that the treatment of fibres participated in removal of wax and oil as well as other gummy materials, which also is in line with FTIR results obtained. Keywords: Extraction, Banana Pseudo-stem Fibers, Scouring, Bleaching, Mercerization, Characterization, Textile

show abstract

Chemical composition of some plantation wood species (Eucalyptus saligna, Cupressus lusitanica and Eucalyptus paniculata) and assessment of compatibility with plaster

Cited by 10 publications

References 16 publications

Extraction and characterization of a novel tropical fibre Megaphrynium macrostachyum as a biosourced reinforcement for gypsum-based biocomposites

Extraction and characterization of a novel tropical fibre Megaphrynium macrostachyum as a biosourced reinforcement for gypsum-based biocomposites

Efficiency evaluation of Neem (Azadirachta indica) oil and copper-ethanolamine in the protection of wood against a subterranean termite attack

Extraction, Treatment and Characterization of Banana Pseudo-Stem Fibers as Potential Utility in Textile Industry

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