Avaliação mecânica e microestrutural de compósitos de poliéster com adição de cargas minerais e resíduos industriais

With the current growth in consumption of industrialized products and the resulting increase in garbage production, their adequate disposal has become one of the greatest challenges of modern society. The use of industrial solid residues as fillers in composite materials is an idea that emerges aiming at investigating alternatives for reusing these residues, and, at the same time, developing materials with superior properties. In this work, the influence of the addition of sand, diatomite, and industrial residues of polyester and EVA (ethylene vinyl acetate), on the mechanical properties of polymer matrix composites, was studied. The main objective was to evaluate the mechanical properties of the materials with the addition of recycled residue fillers, and compare to those of the pure polyester resin. Composite specimens were fabricated and tested for the evaluation of the flexural properties and Charpy impact resistance. After the mechanical tests, the fracture surface of the specimens was analyzed by scanning electron microscopy (SEM). The results indicate that some of the composites with fillers presented greater Young s modulus than the pure resin; in particular composites made with sand and diatomite, where the increase in modulus was about 168 %. The composites with polyester and EVA presented Young s modulus lower than the resin. Both strength and maximum strain were reduced when fillers were added. The impact resistance was reduced in all composites with fillers when compared to the pure resin, with the exception of the composites with EVA, where an increase of about 6 % was observed. Based on the mechanical tests, microscopy analyses and the compatibility of fillers with the polyester resin, the use of industrial solid residues in composites may be viable, considering that for each type of filler there will be a specific application

Estudo da influência de tratamentos químicos da fibra de sisal nas propriedades de compósitos com borracha nitrílica

Fundação de Amparo à Pesquisa do Estado de São Paulo (FAPESP)

Análise do efeito higrotérmico no comportamento em fadiga de compósitos de PPS/fibras de carbono

Fundação de Amparo à Pesquisa do Estado de São Paulo (FAPESP)

Influência da temperatura no desempenho mecânico de compósitos PEI/fibras de vidro

Fundação de Amparo à Pesquisa do Estado de São Paulo (FAPESP)

Compósitos de Al2O3/ZrO2 recobertos com hidroxiapatita dopada com íons Ag

Fundação de Amparo à Pesquisa do Estado de São Paulo (FAPESP)

Avaliação de Diferentes Compósitos na Resistência à Fratura de Núcleos de Preenchimento

Objective: To evaluate and compare the fracture strength of different composite resins used for core buildup. Method: Thirty-six bovine teeth were decoronated at the cervical third to standardize the length of specimens at 20 mm. Under constant irrigation, the canals were prepared with #5 Largo drills corresponding to the size and diameter of #3 Reforpost fiberglass post. The posts were cemented with Enforce resin sealer, being 16 mm inside the root canal and 4 mm outside the root canal, and the material was light-activated for 30 seconds at each side. The specimens were divided into 3 groups (n=12), in which cores (4 mm diameter and 5 mm high) were prepared from a prefabricated standard with three types of composite resins: Group 1: Z100 (3M), Group 2: Z250 (3M) and Group 3: P60 (3M). The specimens were fixed in a cylindrical device with an adaptor at 45o inclination. This device was adapted to a universal testing machine (EMIC) to simulate the force until fracture of the specimen. Data were subjected to ANOVA (p<0.05). Results: The Z250 resin cores presented the highest mean fracture strength (45.453 kgf), while the mean fracture strengths in Group 1 and Group 3 were 38.014 and 39.506 kgf, respectively. P60 caused the largest number of root fractures. Conclusion: Considering the characteristics and properties of the tested resins, Z250 appears as the most indicated for core buildup.

Desenvolvimento de métodos de cultivo de Gluconacetobacter xylinus para obtenção de compósitos à base de celulose bacteriana e colágeno tipo I adicionado in situ

Fundação de Amparo à Pesquisa do Estado de São Paulo (FAPESP)

Análise quantitativa de espectros de absorção no infravermelho de compósitos odontológicos fotoativados

Pós-graduação em Ciência dos Materiais - FEIS

Investigação reológica e análise mecânica de compósitos não-newtonianos

Fundação de Amparo à Pesquisa do Estado de São Paulo (FAPESP)

Obtenção de nanofibras de curauá e aplicação como reforço em compósitos baseados em PVA

Fundação de Amparo à Pesquisa do Estado de São Paulo (FAPESP)

Obtenção e caracterização elétrica e morfológica de compósitos de borracha natural com PZT

Coordenação de Aperfeiçoamento de Pessoal de Nível Superior (CAPES)

Obtenção e caracterização de compósitos de borracha natural e polianilina com ferrita de bário

Pós-graduação em Ciência dos Materiais - FEIS

Síntese e caracterização elétrica de compósitos poliméricos condutores com o poliuretano derivado de óleo de mamona como matriz

Pós-graduação em Ciência dos Materiais - FEIS

Estudo do grau de conversão e dureza em compósitos odontológicos fotopolimerizáveis

Coordenação de Aperfeiçoamento de Pessoal de Nível Superior (CAPES)

Otimização do processamento para obtenção de compósitos polímero/cerâmica com propriedades piezo e piroelétricas

Conselho Nacional de Desenvolvimento Científico e Tecnológico (CNPq)