Hardener
Mostrando 1-11 de 11 artigos, teses e dissertações.
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1. Effect of moringa and bagasse ash filler particles on basalt/epoxy composites
Abstract This study evaluated the effect of moringa and nano ash filler particles on mechanical, chemical corrosion and moisture absorption of basalt fiber/epoxy composites. Epoxy resin and Araldite HY951 hardener was used as matrix along with the inclusion of filler particles while the bi-directional woven basalt fiber mat was used as the reinforcement in f
Polímeros. Publicado em: 09/09/2019
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2. Multi-walled carbon nanotube reinforced polymer as a bonded repair for Al 2024-T3 fatigue crack growth
ABSTRACT The influence on multi walled carbon nanotubes (MWCNT, or simply CNT) as a reinforcement material in an epoxy resin in order to decrease the fatigue crack propagation rate in the 2024 T3 aeronautical Al alloy was studied. CT samples were pre-cracked in a resonant fatigue machine until a 4 mm pre-crack length. Four groups of samples were considered:
Matéria (Rio J.). Publicado em: 06/12/2018
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3. Effect of the hardener to epoxy monomer ratio on the water absorption behavior of the DGEBA/TETA epoxy system
Abstract The water absorption behavior of the DGEBA/TETA epoxy system was evaluated as a function of the epoxy monomer to amine hardener ratio. Weight gain versus immersion time curves were obtained and the experimental points were fitted using Fickian and Non-Fickian diffusion models. The results obtained showed that for all epoxy monomer to hardener ratios
Polímeros. Publicado em: 04/03/2016
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4. Study of epoxy/CNT nanocomposites prepared via dispersion in the hardener
In this study, carboxylated (SWCNT-c) and pristine (SWCNT) single-walled carbon nanotubes were randomly dispersed in a hardener prior to mixing it with an epoxy resin. The influence of several parameters on the dispersion process were investigated. The produced samples were characterized by infrared spectroscopy, differential scanning calorimetry, dilatometr
Materials Research. Publicado em: 03/06/2011
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5. An investigation on graphene and nanoclay effects on hybrid nanocomposites post fire dynamic behavior
This paper deals with the post fire behavior of hybrid nanocomposites under dynamic loadings. A series of tests were performed to investigate how nanoparticles (i.e. nanoclay and graphene nanosheets) affect the post-fire overall composite behavior. Carbon fiber/epoxy-nanoclay and carbon fiber/epoxy-graphene nanosheets were manufactured. The nanoparticles emp
Materials Research. Publicado em: 2010-06
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6. INFLUENCE OF SiO2 ON MECHANICAL PROPERTIES OF DGEBA / INFLUÊNCIA DO SIO2 NAS PROPRIEDADES MECÂNICAS DA DGEBA
In this study we used a different route, simple and economical: the dissolution of the SiO2 powder DGEBA with a hardener to base polymercaptan ( aradur 90 ). Analysis was performed micro hardness in different percentages of the concentration of SiO2. The hardness of multicomponent solid is approximately equal to the average hardness of the material compositi
Publicado em: 2009
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7. Compósitos epóxi/nanotubos de carbono preparados com dispersão de reforço no endurecedor / Epoxy/carbon nanotubes composites prepared with reinforcemen dispersion in the hardener
Neste trabalho, a dispersão randômica de nanotubos de parede simples carboxilados (NCPSc) e nanotubos de parede simples (NCPS) inicialmente no endurecedor foi utilizada de modo a entender os benefícios desse processo, pois a grande maioria dos trabalhos na literatura baseiam-se em dispersão na resina epóxi. De acordo com o tipo de nanotubo (NC), houve u
Publicado em: 2008
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8. Relationship between the dielectric and mechanical properties and the ratio of epoxy resin to hardener of the hybrid thermosetting polymers
Foi investigada a relação entre as propriedades dielétricas (constante dielétrica, épsilon'; fator de perda, épsilon"; energia de ativação, Ea) e a proporção de resina epóxi (OG) para endurecedor em polímeros termorrígidos de resina epóxi (OG). A amplitude do pico de épsilon" decresce com o aumento da porcentagem em massa de OG até aproximada
Journal of the Brazilian Chemical Society. Publicado em: 2006-06
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9. A importância do silício nas relações entre herbívoros e Davilla elliptica (Dilleniaceae) St. Hil no cerrado
We analyzed the effect of the silicon content in the soil to the physical defenses of Davilla elliptica St. Hil. Results show that those plants with higher silicon content in the soil, uptake and accumulate more of this element on the leaf. The higher concentration of silicon on the leaf increased the number of thricoms and hardener the leaves. The increase
Publicado em: 2006
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10. A importÃncia do silÃcio nas relaÃÃes entre herbÃvoros e Davilla elliptica (Dilleniaceae) St. Hil no cerrado
We analyzed the effect of the silicon content in the soil to the physical defenses of Davilla elliptica St. Hil. Results show that those plants with higher silicon content in the soil, uptake and accumulate more of this element on the leaf. The higher concentration of silicon on the leaf increased the number of thricoms and hardener the leaves. The increase
Publicado em: 2006
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11. Fabrication of Amperometric Electrodes
Carbon fiber electrodes are crucial for the detection of catecholamine release from vesicles in single cells for amperometry measurements. Here, we describe the techniques needed to generate low noise (<0.5 pA) electrodes. The techniques have been modified from published descriptions by previous researchers (1,2). Electrodes are made by preparing carbon f
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