Wanderson G. Trindade
University of São Paulo
Izod impact strength testComposite numberUltimate tensile strengthDecompositionBagasseComposite materialAbsorption of waterThermosetting polymerFlexural strengthOrganic chemistryChemical modificationChemistryMaterials scienceHemicelluloseSISALPhenolChlorine dioxideCelluloseEthanolFurfuryl alcoholLigninSisal fiberIonized airSugar caneClosed cellPyrolysisCrystallinityFiberPolymerThermal stabilityReaction mechanismReinforcementDynamic mechanical analysisFlexural modulusAdhesionThermal conductivity
8Publications
7H-index
566Citations
Publications 8
Newest
#1Wanderson G. Trindade (USP: University of São Paulo)H-Index: 7
#2Jane Maria Faulstich de Paiva (UFSCar: Federal University of São Carlos)H-Index: 16
Last. Elisabete Frollini (USP: University of São Paulo)H-Index: 38
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Curaua fibers were treated with ionized air to improve the fiber/phenolic matrix adhesion. The treatment with ionized air did not change the thermal stability of the fibers. The impact strength increased with increase in the fiber treatment time. SEM micrographs of the fibers showed that the ionized air treatment led to separation of the fiber bundles. Treatment for 12h also caused a partial degradation of the fibers, which prompted the matrix to transfer the load to a poorer reinforcing agent d...
19 CitationsSource
#1Wanderson G. Trindade (USP: University of São Paulo)H-Index: 7
#2W. HoareauH-Index: 1
Last. Elisabete FrolliniH-Index: 38
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Composites based on phenolic matrices and unmodified and chemically modified sugar cane bagasse and curaua fibers were prepared. The fibers were oxidized by chlorine dioxide, mainly phenolic syringyl and guaiacyl units of the lignin polymer, followed by grafting furfuryl alcohol (FA), which is a chemical obtained from a renewable source. The fibers were widely characterized by chemical composition analysis, crystallinity, UV−vis diffuse reflectance spectroscopy, SEM, DSC, TG, tensile strength, a...
101 CitationsSource
#1William Hoareau (University of Bordeaux)H-Index: 8
#2Wanderson G. Trindade (University of Bordeaux)H-Index: 7
Last. Elisabete Frollini (USP: University of São Paulo)H-Index: 38
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Abstract Sugar cane bagasse and curaua acidolysis lignins were used to get a better understanding of the mechanism involved in a new chemical modification of sugar cane bagasse and curaua fibres, consisting in a selective oxidation of lignin by chlorine dioxide and reacting some of the created unsaturated units (quinones or muconic derivatives) with furfuryl alcohol (FA). The objective of the treatment was to create a fibre coating increasing compatibility between fibres and phenolic resins in c...
167 CitationsSource
#1Wanderson G. Trindade (USP: University of São Paulo)H-Index: 7
#2William Hoareau (University of Bordeaux)H-Index: 8
Last. Alain Castellan (University of Bordeaux)H-Index: 33
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A new chemical modification of sugar cane bagasse fibers for phenolic thermoset composites is presented. It consists in creating quinones in the lignin portions of fiber and react them with furfuryl alcohol to create a coating around the fiber more compatible with the phenolic resins used to prepare polymeric matrix. Sodium periodate was used in suitable conditions to oxidize mainly phenolic syringyl and guaiacy units of the lignin polymer to create quinones, which were characterized by UV-visib...
66 CitationsSource
#1Jane Maria Faulstich de Paiva (USP: University of São Paulo)H-Index: 16
#1Jane M. F. Paiva (USP: University of São Paulo)H-Index: 4
Last. Luiz C. PardiniH-Index: 1
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Abstract Thermoset polymers (phenolic and lignophenolic) are used as matrix materials for polymeric composites. A great deal of effort has been done in order to use vegetal fibers, obtained from sugarcane bagasse and sisal, to reinforce such matrices, because they are readily available and they are renewable resources. Carbon reinforced materials are usually obtained by using high strength carbon fibers for high-tech demanding aerospace and aeronautical uses. Phenolic type resins are commonly us...
15 CitationsSource
#1Elisabete Frollini (USP: University of São Paulo)H-Index: 38
#2Jane Maria Faulstich de Paiva (USP: University of São Paulo)H-Index: 16
Last. Sandra Patricia da Silva Tita (USP: University of São Paulo)H-Index: 3
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Alkali and ionized air treated and untreated lignocellulosic fibers, such as sisal, jute and curaua, were used to reinforce phenolic and lignophenolic matrix materials. The results favor sisal fiber for its excellent performance as a reinforcing agent of phenolic and lignophenolic matrices, increasing the impact strength up to 35 fold in relation to that obtained with thermoset composites. The use of lignin as a partial substitute for phenol in closed cell lignophenolic foams reduces the thermal...
27 CitationsSource
In this work phenolics pre-polymer (resol type) and pre-polymer lignin-phenol (40% w/w sugar cane bagasse lignin) were synthesized. These pre-polymers were used to prepare matrice of several composites reinforced with bagasse fibers, sisal fibers and curaua fibers. The bagasse and sisal fibers were extracted with cyclohexane/ethanol. The improvement in impact strength was small for sugar cane bagasse reinforced composites and it was very significant for sisal reinforced composites. The curaua fi...
15 CitationsSource
#1Jane M.F Paiva (UNIFESP: Federal University of São Paulo)
Last. Elisabete FrolliniH-Index: 38
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