Monitoramento das propriedades térmicas das borrachas naturais de novos clones: IAC 301 e IAC 303

A borracha natural (BN) de três clones de seringueira [Hevea brasiliensis (Willd. exAdr. de Juss. Muell.-Arg.)] de um período de sete meses foi obtida por coagulação do látex com solução de ácido acético a 10% e seca a 65°C. As curvas TG-DTG foram utilizadas para monitorar as propriedades térmicas da BN. Os resultados indicaram pequenas variações entre clones e coletas, exceto no valor de Tf-T0, indicando que o clone IAC 301 sofre degradação mais rápida durante o processo termo degradação da BN seca. Não houve diferenças significativas nos valores de Tg entre clones e coletas.

Estudo da influência de argilas organofílicas no processo de biodegradação do PLA

In this study nanocomposites of PLA and organoclays Cloisite 20A and Cloisite 30B were prepared by melt intercalation. The influence from the organoclays on the biodegradation of PLA was evaluated based on the respirometry method. The incorporation of clay Cloisite 20A did not change the mineralization curve of PLA. The nanocomposite with Cloisite 30B, on the other hand, presented a different behavior, indicating a delay in the polymer biodegradation. The materials were characterized by X-ray Diffraction, Thermogravimetric Analysis and Differential Scanning Calorimetry. The materials characterization indicated nanocomposites with an intercalated structure as well as reduced thermal stability and a slight increase in the degree of crystallinity compared to the pure polymer.

Práticas de gestão ambiental das indústrias coureiras de Franca-SP

The leather footwear industry is an important sector in the Brazilian economy. The tannery industry accounted for $ 2.05 billion to exports in 2011, which represents a contribution of 6.86% to the Brazilian balance of trade. However, it is a highly polluting industry generating highly toxic and hazardous waste. Therefore, it is extremely important to search for environmental management actions that allow a cleaner production and waste recycling to prevent its discharge into the environment resulting in the deterioration of nature and quality of human life. Thus, based on a literature review and exploratory research, this study consisted of an analysis of some environmental management actions adopted by the leather industry in Franca - SP verifying if the industries have certifications or follow standards that characterize a responsible environmental management. This study is justified by the fact that tanneries and footwear industries produce highly hazardous waste, and therefore environmental actions are necessary to treat the waste effectively in order to minimize its environmental impacts. The literature review and empirical research conducted demonstrated the development of new techniques and technologies aiming at mitigating the impacts of leather waste in the environment. These actions are crucial for companies to remain competitive and focused on sustainability in this rapidly growing market.

Plataformas bio(muco) adesivas poliméricas baseadas em nanotecnologia para liberação controlada de fármacos - propriedades, metodologias e aplicações

Studies using bio(muco)adhesive drug delivery systems have recently gained great interest, which can promote drug targeting and more specific contact of the drug delivery system with the various absorptive membranes of the body. This technological platform associated with nanotechnology offers potential for controlling drug delivery; therefore, they are excellent strategies to increase the bioavailability of drugs. The objective of this work was to study nanotechnology-based polymeric bio(muco)adhesive platforms for controlling drug delivery, highlighting their properties, how the bio(muco)adhesion can be measured and their potential applications for different routes of administration.

Degradação de membrana impermeabilizante de polietileno de alta densidade usada em tanques de armazenamento de vinhaça

High-density polyethylene (HDPE) water-proof membranes are used as coatings in vinasse (leachate from sugar cane) storage tanks. The leachate is pumped into the tanks at temperatures of 80-90 °C. Due to these high temperatures and acidity of the waste, these membranes can be degraded, cracked and then loose the function for which they have been designed. This may cause contamination of the soil and groundwater. This study evaluated the effect of vinasse in HDPE membranes after 4 months of exposure in a controlled environment. An aggressive, alkaline pH liquid (sodium hydroxide) was also used. The objective was to evaluate the membrane resistance in contact with acidic and alkaline residues. Physical and mechanical tests, measurement of the carbon black content and thermo gravimetric analysis (TGA) were used to determine degradation of polymer membranes after chemical immersion. While sodium hydroxide resulted caused only minor changes in the physical properties, vinasse induced a thickness change of 7.8%. With immersion in vinasse, an average decrease in strength and deformability (yield) of 34% and 23.5% were measured, respectively. The stiffness increased by 7.8% (average) and the tear strength decreased by 2.7% (average).

β- glucanas de Lasiodiplodia theobromae MMBJ: avaliação da atividade imunomoduladora e como filme transportador de fármaco

Coordenação de Aperfeiçoamento de Pessoal de Nível Superior (CAPES)

Biodegradação de filmes de polietileno de baixa densidade (PEBD), polihidroxibutirato-co-hidroxivalerato (PHBV) e blenda de PEBD/PHBV (70/30), em coluna de solo

Coordenação de Aperfeiçoamento de Pessoal de Nível Superior (CAPES)

Tubos de concreto com adição de resíduos de borracha de pneu

Pós-graduação em Engenharia Civil - FEIS

Simulação computacional e síntese de polímero molecularmente impresso para extração em fase sólida (MISPE) de ciprofloxacina em urina

Pós-graduação em Química - IQ

Estudo comparativo da textura superficial entre os materiais estéticos indiretos

The purpose of this study was to evaluate surface rugosity among indirect esthetic materials (Vita VMK 95, Solidex, Artglass, Targis). Ten samples of each material in the cilindric shape with dimension 6 x 6 mm were manufactured. The surface were submitted to finishing and polishing, according to manufacturer's recommendations. The samples were submitted to measuremenst, using the Hommel Tester T500 device. The average values of maxim surface rugosity among the materiais ín question, were 5, 73pm; 5, 15pm; 6, 83 j.Jm e 3, 72 j.Jm, respectively. Sample were also subjectted to variance analysis- ANOVA (5%), had detected significance. Concluded that the material Solidex did not present significant statistical differences among groups, while Targis presented significant statistical differences in relation to the Artglass and the ceramic Vita vmk95.

Sistemas anfifílicos derivados de megiumina: uma nova abaordagtem no desenvolvimento de biomateriais supramoleculares

Pós-graduação em Química - IQ

Efeito da adição de moléculas anfifílicas na formação de filmes Langmuir e Langmuir-Blodgett de derivados alquilados do politiofeno: aplicação em sensores

Coordenação de Aperfeiçoamento de Pessoal de Nível Superior (CAPES)

Plásticos comerciais tratados a plasma para dispositivos ópticos e embalagens alimentícias

Coordenação de Aperfeiçoamento de Pessoal de Nível Superior (CAPES)

Tall oil e seus subprodutos: alternativas como preservantes para madeira

Pós-graduação em Engenharia Mecânica - FEG

Otimização de rotas tecnológicas de processamento e distribuição de resíduos municipais

Pós-graduação em Engenharia Mecânica - FEG