7 documents found, page 1 of 1
Preparation and Characterization of Nanowhiskers Cellulose from Fiber Arrowroot...
Sá,Renato Mariano de; Miranda,Cleidiene Souza de; José,Nadia MamedeThe agribusiness generates countless sources of biomass that are not appropriately and / or adequately utilized, turning them into industrial wastes. This study aims to explore the Arrowroot fiber as a source of raw material for the cellulose nanowhiskers production by acidic hydrolysis. Hydrolyses were carried out varying the temperature and the sulfuric acid concentration, with the hydrolysis reaction time fi...
Physicochemical, Mechanical and Morphologic Characterization of Purple Banana F...
Gonçalves,Ana Paula Bispo; Miranda,Cleidiene Souza de; Guimarães,Danilo Hansen; Oliveira,Jamerson Carneiro de; Cruz,Allan Moreira FaislonWeather conditions and the Brazilian fertile soil contribute to abundant natural resources in a wide variety of fiber types. These fibers have attracted interest in Materials Science area for such characteristics as: low cost, high elasticity modulus and renewability. In this context, the objective of this work was physical, chemical and morphological characterization of purple banana fibers (Musa velutina). Th...
Development of Starch Biofilms Using Different Carboxylic Acids as Plasticizers
Cruz,Luana Conceição da; Miranda,Cleidiene Souza de; Santos,Wilton Jesus dos; Gonçalves,Ana Paula Bispo; Oliveira,Jamerson Carneiro deBiodegradable films are widely exploited among scientists nowadays. Their positive environmental impact, besides their potential to promote better food conservation and an increase in shelf life motivate research in this field. Availability, low cost and biodegradability of starch increase the interest of using this material to produce biodegradable films. However, starch films tend to be brittle and they need ...
Effect of the Glycerol and Lignin Extracted from Piassava Fiber in Cassava and ...
Souza de Miranda,Cleidiene; Ferreira,Marina Santos; Magalhães,Mariana Tibo; Gonçalves,Ana Paula Bispo; Carneiro de Oliveira,JamersonSeveral alternatives have been considered to minimize the environmental impact caused by conventional polymers. This study aims to evaluate the chemical, mechanical and morphological properties of flexible thermoplastic films of cassava and corn starch, using glycerol and lignin as plasticizers and reinforcement. The films were produced through casting. It was observed that the presence of lignin effectively in...
Synthesis and characterization of polyesters derived from glycerol and phthalic...
Guimarães,Danilo Hansen; Brioude,Michel de Meireles; Fiúza,Raigens da Paz; Prado,Luis Antônio Sanches de Almeida; Boaventura,Jaime SoaresThe production of polyester via polycondensation between glycerol and phthalic acid using dibutyltin dilaurate is reported. Three glycerol:phthalic acid molar ratio used for the bulk polymerization were: 2:2; 2:3 and 2:4. FTIR confirmed the esterification of glycerol by the acid for all the polymers. DSC indicated no crystallinity, although the XRD plots indicate a very incipient crystallinity for the polymers ...
Synthesis and characterization of aliphatic polyesters from glycerol, by-produc...
Brioude,Michel de Meireles; Guimarães,Danilo Hansen; Fiúza,Raigenis da Paz; Prado,Luis Antônio Sanches de Almeida; Boaventura,Jaime SoaresIn the present work, polyesters were prepared from the polycondensation between glycerol and adipic acid using dibutyltin dilaurate as catalyst. Three glycerol: adipic acid molar ratio were used for the bulk polymerization namely: 2:2; 2:3 and 2:4. FTIR confirmed the esterification of glycerol by the acid for all the polymers. DSC and XRD indicated no crystallinity for all the polymers. The morphology of the ma...
Materiais híbridos orgânico-inorgânicos: preparação e algumas aplicações
José,Nadia Mamede; Prado,Luís Antônio Sanchez de AlmeidaThe preparation and application of organic-inorganic hybrid materials are under fast development and constitute an interesting research topic on account of the versatility and wide range of applications offered by these materials. These properties can be achieved due to the mixture of the components at the molecular level. The present review covers the state of the art, the most useful preparation routes and th...