Sandra Patricia da Silva Tita
University of São Paulo
Izod impact strength testBagasseNuclear chemistryComposite materialAbsorption of waterThermosetting polymerDispersion (optics)Flexural strengthChemical modificationMaterials scienceMetric (mathematics)Residual strengthSISALPhenolSuccinic anhydrideTest (assessment)LigninSisal fiberIonized airClosed cellTreatment methodFiberStructural engineeringThree point flexural testThermal conductivity
Publications 4
#1Sandra Patricia da Silva Tita (USP: University of São Paulo)H-Index: 3
Last. Volnei Tita (USP: University of São Paulo)H-Index: 19
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Chemical modification of fiber surfaces can increase wettability of composites reinforced by vegetal fibers and, consequently, the dispersion of the fiber in the matrix and mechanical properties can be improved. Although there are some studies about agents for chemical modifications of vegetal fiber surfaces, there are few data and discussion about the usage of lignin. In the present work, chemical modifications of sugarcane bagasse and sisal fibers using lignin (previously hydroxymethylated) we...
10 CitationsSource
#2Murilo SartoratoH-Index: 3
Last. Volnei TitaH-Index: 19
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#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
Phenolic and lignophenolic (40% sugarcane bagasse lignin/phenol w/w) pre-polymers were synthesized to produce thermoset matrices composites, using sugarcane bagasse as reinforcing agent. This lignocellulosic material was modified by chemical and/or physical methods (alkali treatment, esterification, ionized air). Sugarcane bagasse showed a small improvement in impact strength for both phenolic and lignophenolic matrices. The surface treatment methods improved dispersion as well as adhesion betwe...
36 CitationsSource