Encontrados 19 documentos, a visualizar página 1 de 2
Manufacture and performance of peanut skin cellulose nanocrystals
Manrich,Anny; Martins,Maria Alice; Mattoso,Luiz Henrique CapparelliABSTRACT: Due to their remarkable characteristics, cellulose nanocrystals are strategic materials that has various industrial applications, and are capable of being produced from vegetable fibers derived from the discards of agricultural practices. Peanut(Arachis hypogaea L.) peel is a residue considered of low commercial value and high polluting potential that needs new applications in order to mitigate these ...
PROCESSAMENTO E APLICAÇÃO DE BIOMATERIAIS POLIMÉRICOS: AVANÇOS RECENTES E PERSP...
Bernardo,Marcela Piassi; Paschoalin,Rafaella Takehara; Santos,Danilo Martins dos; Bilatto,Stanley; Farinas,Cristiane Sanchez; Correa,Daniel SouzaBiomaterials have been intensively investigated due to the increase in the elderly population and high prevalence of several disorders, such as cardiovascular and orthopedic diseases. Polymeric and composite polymeric materials in combination with different processing techniques, such as electrospinning, solution blow spinning, ultrathin film preparation, and 3D printing are promising for obtaining biomaterials...
Mechanical and water absorption properties and morphology of melt processed Zei...
Torres,Sandro Junior Vessoni; Medeiros,Gabriela Brunosi; Rosário,Francisco; Yamashita,Fabio; Mattoso,Luiz Henrique Capparelli; Corradini,ElisângelaAbstract Blends of zein and poly(vinyl alcohol) (PVAl) were processed in an internal mixer (150ºC, 50 rpm) for 5-8 minutes. Glycerol and oleic acid were used as plasticizers. The mixtures obtained were then compression molded and further characterized by Fourier transform infrared spectroscopy (FTIR), water-absorption experiments, mechanical tests, and scanning electron microscopy (SEM). FTIR analysis indicated...
Non-isothermal decomposition kinetics of conductive polyaniline and its derivat...
Alves,William Ferreira; Malmonge,José Antonio; Mattoso,Luiz Henrique Capparelli; Medeiros,Eliton Souto deAbstract The non-isothermal decomposition kinetics of conductive polyaniline (PANI) and its derivatives, poly(o-methoxyaniline) (POMA) and poly(o-ethoxyaniline) (POEA), was investigated by thermogravimetric analysis (TGA), under inert and oxidative atmospheres, using Flynn-Wall-Ozawa’s approach to assess the kinetic parameters of the decomposition process. The order of reaction was found to be dependent on the ...
Thermoplastic Waxy Starch Films Processed by Extrusion and Pressing: Effect of ...
Manoel,Anderson Felix; Claro,Pedro Ivo Cunha; Mattoso,Luiz Henrique Capparelli; Marconcini,José Manoel; Mantovani,Gerson LuizThermoplastic starch properties depends of plastification process. The aim of this study was to analyze the effect of concentration of glycerol and water on plastification, glass transition temperature (Tg) and tensile properties of thermoplastic waxy starch (TPWS). Formulations were extruded in the following concentrations of starch/glycerol/water: 70/30/0 (TPWS 0%); 70/25/5 (TPWS 5%); 70/20/10 (TPWS 10%) weig...
Caracterização morfológica de nanocristais de celulose por microscopia de força...
Moraes,Ariana de Souza; Góes,Thais Soares de; Hausen,Moema; Morais,João Paulo Saraiva; Rosa,Morsyleide de Freitas; Menezes,Aparecido Júnior deRESUMO O isolamento de nanocristais de celulose (CNCs) de fibras vegetais é uma alternativa promissora para sua aplicação como reforço em matrizes poliméricas. A caracterização dos CNCs é fundamental para a confiabilidade da técnica, além de determinar as aplicações possíveis a partir de cada tipo de fibra. A partir da técnica de microscopia de força atômica, um estudo da morfologia e distribuição dos CNCs de s...
Effect of Fiber Treatment Condition and Coupling Agent on the Mechanical and Th...
Simão,José Alexandre; Carmona,Vitor Brait; Marconcini,José Manoel; Mattoso,Luiz Henrique Capparelli; Barsberg,Søren Talbro; Sanadi,Anand RameshAbstract This paper reports on a study of highly filled composites of polypropylene (PP) and 75% by weight sugarcane bagasse fiber with and without alkali treatment and with and without coupling agent (SEBS-g-MA). Composites were prepared using a Rheomix600 mixer connected to a HAAKE torque rheometer. The thermal and mechanical behavior of these composites were investigated by thermogravimetry (TGA), differenti...
Desenvolvimento de filmes poliméricos ultrafinos e reticulados para aplicações ...
Medeiros,Eliton Souto de; Martinez,Rodrigo Andrade; Bernardes Filho,Rubens; Gregório Filho,Rinaldo; Mattoso,Luiz Henrique CapparelliResumo Este trabalho propõe um novo método de produção de filmes estáveis para aplicações em sensores baseado na deposição pela técnica de automontagem de poli(o-etoxianilina) alternada com fenol-formaldeído (POEA/PF) seguida por cura térmica. O processo de reticulação foi caracterizado por espectroscopias no infravermelho por transformada de Fourier e no ultravioleta-visível, microscopia de força atômica e est...
Preparação de novos nanobiocompósitos comestíveis ativos contendo nanoemulsão d...
Moura,Marcia Regina de; Aouada,Fauze Ahmad; Souza,Juliana Reghine; Mattoso,Luiz Henrique CapparelliNeste trabalho, o objetivo foi produzir nanobiocompósitos biodegradáveis à base de pectina e nanoemulsão de canela que tenham propriedades satisfatórias para aplicação como embalagens ativas. Foram detalhados os procedimentos de preparação das nanoemulsões e incorporação dessas na matriz polimérica. Foi apresentada uma metodologia nova de análises dos melhores nanocompósitos através de um planejamento baseado e...
Effect of rootstock on the scion of Hevea brasiliensis through metabolic analys...
Nascimento,Eduardo Sanches Pereira do; Oliveira,Clayton Rodrigues de; Gonçalves,Paulo de Souza; Costa,Reginaldo Brito da; Moreno,Rogério Manoel BiagiIn this study, the effect of rootstock on grafting through metabolomic analysis of latex (Hevea brasiliensis) samples was verified by ¹H nuclear magnetic resonance (NMR) and multivariate data analysis. Sixteen metabolites present in the latex cytosol were characterized by NMR. PCA analysis showed that the latex samples of the RR and GR groups can be differentiated. The GR group samples present a metabolic profi...