Poly Ether Ether Ketone
Mostrando 1-12 de 18 artigos, teses e dissertações.
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1. Temporal Evolution of Roughness Development on Polymer Surfaces Exposed to Non-Thermal Plasma
Processes such as ablation, erosion and corrosion generally create roughness patterns on solid surfaces. Despite the randomness of this phenomenon, some patterns can be described mathematically by studying statistically the mechanisms behind them. This paper reports an experimental study on the temporal evolution of the roughness development of polymer surfa
J. Braz. Chem. Soc.. Publicado em: 2020-10
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2. COVID-19, Sistema Renina-Angiotensina, Enzima Conversora da Angiotensina 2 e Nicotina: Qual a Inter-Relação?
Processes such as ablation, erosion and corrosion generally create roughness patterns on solid surfaces. Despite the randomness of this phenomenon, some patterns can be described mathematically by studying statistically the mechanisms behind them. This paper reports an experimental study on the temporal evolution of the roughness development of polymer surfa
Arq. Bras. Cardiol.. Publicado em: 2020-10
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3. Tribology of natural Poly-Ether-Ether-Ketone (PEEK) under transmission oil lubrication
Abstract High performance polymeric materials such as poly-ether-ether-ketone (PEEK) are increasingly being used for challenging tribological applications in order to replace metal parts in vehicle engines and transmissions. The tribology of natural PEEK, under oil-lubricated conditions, was studied for different metal counterbody finishes. Two different fin
Polímeros. Publicado em: 04/07/2019
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4. Sulfonated poly(ether ether ketone)/hydroxyapatite membrane as biomaterials: process evaluation
Abstract Poly(ether ether ketone) (PEEK) has excellent properties, such as high biocompatibility and an elastic modulus similar to bone, which makes it a suitable biomaterial. When modified with sulfuric acid (H2SO4) and hydroxyapatite (HA), its workability and bioactivity is enhanced, and this makes it of great importance in medicine. This study investigat
Polímeros. Publicado em: 18/03/2019
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5. Sulfonation degree effect on ion-conducting SPEEK-titanium oxide membranes properties
Abstract Polymeric membranes were developed using a SPEEK (sulfonated poly(ether ether ketone)) polymer matrix, containing titanium oxide (TiO2) (incorporated by sol-gel method). SPEEK with different sulfonation degrees (SD): 63% and 50% were used. The influence of sulfonation degree on membrane properties was investigated. The thermal analysis (TGA and DTGA
Polímeros. Publicado em: 21/09/2017
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6. Effect of surface finishing on friction and wear of Poly-Ether-Ether-Ketone (PEEK) under oil lubrication
Abstract The tribological properties of poly-ether-ether-ketone (PEEK) containing 30% of carbon fiber were studied in an oil-lubricated environment and different surface finishing of the metallic counterbody. Four different finishing processes, commonly used in the automotive industry, were chosen for this study: turning, grinding, honing and polishing. The
Polímeros. Publicado em: 08/12/2016
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7. Chemical and Thermal Evaluation of Commercial and Medical Grade PEEK Sterilization by Ethylene Oxide
Many polymers have been used as biomaterials due to their physicochemical characteristics and structural versatility. However, usage on the human body requires sterilization in order to prevent microbial contamination and diminish the risk of rejection or inflammation. This study presents the use of thermogravimetric analysis (TGA) as an alternative to monit
Mat. Res.. Publicado em: 03/06/2016
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8. Structural and Thermo-mechanical Evaluation of Two Engineering Thermoplastic Polymers in Contact with Ethanol Fuel from Sugarcane
Special polymers have been used in the manufacture of storage structures and pipelines avoiding corrosive processes during ethanol fuel transport/storage. Therefore, this work investigated comparatively the effects of the ethanol on the physical-mechanical properties of poly (ether ether ketone) (PEEK) and polyamide 11 (PA-11) based on ageing tests. The WAXD
Mat. Res.. Publicado em: 19/02/2016
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9. Nanostructured Polyelectrolytes Based on SPEEK/TiO2 for Direct Ethanol Fuel Cells (DEFCs)
Proton-conducting hybrid membranes consisting of poly(ether ether ketone) sulfonated (SPEEK) and titanium oxide (TiO2) were prepared using the sol-gel technique for application in direct ethanol fuel cells. The effect from TiO2 incorporation on membrane properties such as ethanol uptake, pervaporation and proton conductivity was investigated. The uptake and
Polímeros. Publicado em: 10/06/2014
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10. Evaluation of decomposition kinetics of poly (ether-ether-ketone) by thermogravimetric analysis
The non-isothermal thermogravimetric methods have been used extensively for the determination of kinetic parameters in polymers. The poly (ether ketones) are used as matrix in advanced high performance composites due its high thermal stability, excellent environmental performance and superior mechanical properties. In this work, the non-isothermal decomposit
Mat. Res.. Publicado em: 17/12/2013
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11. "Developments of hybrid membranes from sulfonated poly (aryl ether ketones) ketone and phosphonated copolysetsesquioxanes to application in proton exchange membrane fuel cell - PEMFC" / "Desenvolvimento de membranas híbridas a partir de poli(éter-éter-cetona) sulfonada e copolisilsesquioxanos fosfonados para aplicação em célula a combustível com membrana trocadora de prótons - PEMFC"
A atual membrana de referência para as células a combustível com membrana trocadora de prótons (PEMFC) é o Nafion que exibe boa estabilidade química e também alta condutividade de prótons sob condições hidratadas em temperaturas abaixo de 90C. Entretanto, a aplicação destas membranas ainda é limitada devido à perda de condutividade em temperatu
IBICT - Instituto Brasileiro de Informação em Ciência e Tecnologia. Publicado em: 25/07/2011
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12. Evaluation of crystallization kinetics of poly (ether-ketone-ketone) and poly (ether-ether-ketone) by DSC
Abstract: The poly (aryl ether ketones) are used as matrices in advanced composites with high performance due to its high thermal stability, excellent environmental performance and superior mechanical properties. Most of the physical, mechanical and thermodynamic properties of semi-crystalline polymers depend on the degree of crystallinity and morphology of
J. Aerosp. Technol. Manag.. Publicado em: 2010-08