13 documents found, page 1 of 2
Selection of materials for blast furnace injection using quality indicators.
Campos, Alex Milton Albergaria; Novack, Kátia Monteiro; Assis, Paulo SantosThe injection of pulverized materials is a technique used in most of the blast furnaces in the world to reduce coke and charcoal consumption. In addition, injection is one of the main variables of the blast furnace heat control. Coal is the most used material for the injection, but some industries have been attempting to use other materials, usually mixtures, in order to reduce the total dependence on it. The q...
Influence of Moringa oleifera derivates in blends of PBAT/PLA with LDPE.
Quintão, Cristiane Medina Finzi; Novack, Kátia Monteiro; Silva, Ana Cláudia Bernardes; Silva, Thais Dhayane; Moreira, Lucas Emiliano de SouzaThere are few studies about Moringa oleifera derivates in polymer developments where vegetable oil was used as a plasticizer and a biodegrading agent. The polymerization of moringa oil (MO) was carried out assisted by microwaves without catalysts presence. There aren’t studies about the polymerization of MO using microwaves technology. Moringa’s oil and its polymer (PMO) were used as a biodegrading agent for mi...
Moringa oleifera oil and polymer in mixtures with commercial polymers – compari...
Quintão, Cristiane Medina Finzi; Silva, Ana Cláudia Bernardes; Melo, Tânia Márcia Sacramento; Moreira, Lucas Emiliano de Souza; Silva, Thais D.Composites may be obtained by the mixture of two materials, which one of them is a polymer, with the objective of produced a material with a specific characteristics. Vegetable oils (VO) are mixture with conventional polymer to improve biodegradation capacity without loss mechanical properties. VOs polymers are an alternative to conventional polymers on composites. Previous studies showed that the mixture of Mo...
Combustion of biomass and charcoal made from babassu nutshell.
Protásio, Thiago de Paula; Guimarães Júnior, Mário; Mirmehdi, Seyedmohammad; Trugilho, Paulo Fernando; Napoli, Alfredo; Novack, Kátia MonteiroNos últimos anos, pesquisadores têm analisado o uso de resíduos lignocelulósicos para geração de energia. No entanto, há uma falta de informação sobre a combustibilidade da biomassa residual, especialmente a casca e o carvão vegetal do coco babaçu. Neste estudo foram utilizadas as análises termogravimétricas (TGA), térmica diferencial (DTA) e de calorimetria exploratória diferencial (DSC) para: avaliar a combus...
Starch/PVA-based nanocomposites reinforced with bamboo nanofibrils.
Guimarães Júnior, Mário; Botaro, Vagner Roberto; Novack, Kátia Monteiro; Teixeira, Fábio Gomes; Tonoli, Gustavo Henrique DenzinThis work aimed to evaluate the effect of including different concentrations of bamboo nanofibrils on physical, mechanical, morphological and structural properties of nanocomposites from cassava starch and polyvinyl alcohol (PVA). Nanocomposites were prepared with blends of starch/PVA and nanofibrils of bamboo. Chemical pre-treatments and mechanical defibrillation were used to obtain the nanofibrils. The mixtur...
Efeito compatibilizante de copolímeros contendo segmentos líquido-cristalinos e...
Novack, Kátia Monteiro; Stellet, Carla Andrade; Gomes, Ailton de SouzaUma série de copolímeros com segmentos líquido-cristalinos foram sintetizados por policondensação em solução a alta temperatura e misturados com poli(tereftalato de etileno) (PET) e um poliéster líquido-cristalino termotrópico (TLCP), previamente sintetizado. Os copolímeros foram utilizados com sucesso como compatibilizantes nas misturas PET/TLCP. As técnicas de caloria diferencial de varredura, análises dinâmi...
Synthesis and characterization of hydrogels from cellulose acetate byesterifica...
Senna, André Martins; Novack, Kátia Monteiro; Botaro, Vagner RobertoHydrogels were prepared from cellulose acetate with a degree substitution (DS) 2.5 dissolved indimethylformamide by esterification crosslinking with Ethylenediaminetetraacetic dianhydride (EDTAD)catalyzed by triethylamine. Subsequent conversion of the unreacted carboxyl groups to sodium carbox-ylates by the addition of aqueous NaHCO3was performed to enhance the water affinity of the gels. Theabsorbency of the p...
Caracterização anatômica da fibra de bambu (Bambusa vulgaris) visando sua utili...
Guimarães Júnior, Mário; Novack, Kátia Monteiro; Botaro, Vagner RobertoO desenvolvimento de materiais compósitos utilizando fibras vegetais como reforço é crescente e vêm conquistando novos segmentos de mercado, pois as fibras vegetais apresentam baixo custo, biodegradabilidade, menor densidade e boas propriedades mecânicas, físicas e térmicas adequadas às aplicações industriais. Este trabalho apresenta os resultados de recentes pesquisas sobre a fibra de Bambusa vulgaris realizad...
Biological evaluation of crude and degummed oil from Moringa oleifera seeds.
Andrade, Graziela de Fátima; Melo, Tânia Márcia Sacramento; Guedes, Claudia Dumans; Novack, Kátia Monteiro; Santos, Rinaldo Cardoso dosThe aim of this work was to evaluate the oil extracted from Moringa oleifera (fam. Moringaceae) seeds from the nutritional standpoint. Nutritional evaluation of crude or degummed moringa oil or soybean oil (as a control) involved the determination of the Food Efficiency (FE) in male Fisher rats and the fatty acid composition of the moringa oil. Hepatic and renal functions were assessed by measuring serum transa...
Caracterização físico-química de fibra e polpas de Bambusa vulgaris Schrad para...
Guimarães Júnior, Mário; Novack, Kátia Monteiro; Botaro, Vagner Roberto; Protásio, Thiago de Paula; Couto, Allan MottaAtualmente é crescente o interesse pelos compósitos poliméricos reforçados com fibras naturais vegetais em substituição às fibras manufaturadas. Isto se deve ao fato das fibras vegetais serem menos abrasivas, biodegradáveis, apresentar baixa densidade e excelentes propriedades mecânicas e térmicas. Várias fibras vegetais vêm sendo utilizadas nos mais variados tipos de compósitos, dentre as quais as de bambu se ...