Durability of lignocellulosic fibers treated with vegetable oil–phenolic resin

Saha, Prosenjit; Manna, Suvendu; Sen, Ramkrishna; Roy, Debasis; Adhikari, Basudam

doi:10.1016/j.carbpol.2011.09.070

Cited by 37 publications

(20 citation statements)

References 38 publications

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“…The closure of surface micropores present on the unmodified coir surface was evident on the surface of modified fibre. Rahman and Khan [38] and Saha et al [39] have also reported smoothening of lignocellulosic fibre surfaces upon surface modification. Unmodified geotextile samples exhibited highest water uptake and lowest tensile strength with passage of time.…”

Section: Surface Morphologymentioning

confidence: 94%

Experimental Investigations on Biological Resistance of Surface Modified Coir Geotextiles

Sumi¹,

Unnikrishnan²,

Mathew³

2016

Int. J. of Geosynth. and Ground Eng.

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Results of detailed experimental studies carried out to investigate the resistance of coir geotextiles modified using cashew nut shell liquid (CNSL) to attack of biological organisms are reported. A mixed spore suspension composed of four fungal stains, Chaetomium indicum, Curvularia lunata, Aspergillus fumigatus and Penicillium rubrum was used to study microbial susceptibility of coir geotextiles in humid warm atmosphere. Soil burial studies were carried out under controlled conditions for a period of 240 days to learn the behaviour of geotextiles in contact with specially prepared soil containing a variety of microorganisms. A field study was carried out to investigate the behaviour of coir geotextiles in subterranean termite mounds. The improved properties of modified coir geotextiles were substantiated on the basis of weight loss, moisture absorption, tensile strength and surface morphology. The results show that biological resistance of coir geotextiles was greatly improved by modification with CNSL. Tensile strength of unmodified samples reduced to 19 % whereas modified geotextiles retained 76 % of the initial tensile strength at the end of 240 days of soil burial. SEM images affirm that modification of coir with CNSL obtained in the present work could close the pores on fibre surface and delay biological degradation considerably.

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Section: Surface Morphologymentioning

confidence: 94%

Experimental Investigations on Biological Resistance of Surface Modified Coir Geotextiles

Sumi¹,

Unnikrishnan²,

Mathew³

2016

Int. J. of Geosynth. and Ground Eng.

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“…These results indicated that acid hydrolysis did not change the crystalline character of cotton linter. Moreover, the crystalline character of PCL didn't change upon addition of cotton linter or cotton nanolinter [25][26] .…”

Section: Particle Size and Zeta Potential Measurementsmentioning

confidence: 96%

Processing and Properties of PCL/Cotton Linter Compounds

et al. 2017

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Biodegradable compounds of poly(ε-caprolactone) (PCL)/ cotton linter were melting mixed with filling content ranging from 1% to 5% w/w. Cotton linter is an important byproduct of textile industry; in this work it was used in raw state and after acid hydrolysis. According to the results of torque rheometry no decaying of viscosity took place during compounding, evidencing absence of breaking down in molecular weight. The thermal stability increased by 20% as observed in HDT for PCL/cotton nanolinter compounds. Adding cotton linter to PCL didn't change its crystalline character as showed by XRD; however an increase in degree of crystallinity was observed by means of DSC. From mechanical tests in tension was observed an increase in ductility of PCL, and from mechanical tests in flexion an increase in elastic modulus upon addition of cotton linter, whereas impact strength presented lower values for PCL/cotton linter and PCL/cotton nanolinter compounds. SEM images showed that PCL presents plastic fracture and cotton linter has an interlacing fibril structure with high L/D ratio, which are in agreement with matrix/fibril morphology observed for PCL/cotton linter compounds. PCL/cotton linter compounds made in this work cost less than neat PCL matrix and presented improved properties making feasible its commercial use.

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“…Two clear advantages have been reported to obtain from alkalisteam explosion of lignocellulosic fibers: (a) increase to tensile strength due to part removal of noncellulosic materials such as pectin, hemicelluloses, and lignin 57 and (b) increase of chemical reactivity of free surface −OH groups due to destruction of inter and intramolecular hydrogen bonds as a result of alkalisteam treatment. 58 From the measured data presented in Table 1, it is evident that flexural strength and elongation at break of alkali-steam treated wood sample were increased up to 40% and 6% respectively compared to untreated wood. That was due to reorientation of cellulose chains within wood matrix after part removal of noncellulosic amorphous materials such as lignin, hemicelluloses, and pectin following alkali-steam treatment.…”

Section: ■ Resultsmentioning

confidence: 92%

New Biobased Surface Treatment to Improve Strength and Durability ofBombax ceiba

Saha

Chowdhury

Manna³

et al. 2015

ACS Sustainable Chem. Eng.

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Bombax ceiba, commonly known as silk-cotton, can be used as an inexpensive substitute for existing conventional hard-and softwoods as it is abundantly available and can be harvested from fast-growing plant species. However, its softness and high biodegradable nature restrict its use in such constructions where strength and durability are important. This study presents a treatment process with plant based chemicals to enhance the strength, hydrophobicity, and biodegradation resistance of the silk-cotton wood for its extensive use in long lasting engineering constructions. Soft lumbers of silk-cotton wood were modified with phenolic resin and neem oil. Chemical changes of the modified wood were investigated by Fourier-transform infrared (FTIR) and 13 C solid state NMR spectroscopy. Experimental results reveal that the hydroxyl groups of the wood surface were transesterified with the fatty acyl chains of the neem oil. Flexural strength and water repellence of chemically treated wood samples were found to enhance up to 50% and 75%, respectively. A soil burial test up to 90 days was also performed for evaluating the long-term strength retention of both untreated and treated samples. After exposure to soil burial the long-term flexural strength for the treated silk-cotton wood was found to retain up to 88% of its initial strength. The corresponding value for untreated sample was 32%. Leachate generated from the treated wood sample was investigated for toxicity by dipping the lumbers into different pH solutions and a high saline environment. Leachate study showed that the concentration of toxic chemicals in the leachate was within permissible limits.

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Durability of lignocellulosic fibers treated with vegetable oil–phenolic resin

Cited by 37 publications

References 38 publications

Experimental Investigations on Biological Resistance of Surface Modified Coir Geotextiles

Experimental Investigations on Biological Resistance of Surface Modified Coir Geotextiles

Processing and Properties of PCL/Cotton Linter Compounds

New Biobased Surface Treatment to Improve Strength and Durability ofBombax ceiba

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