Fluoroelastomer Compatibility with Biodiesel Fuels

Thomas, E.; Fuller, Robert E.; Terauchi, Kenji

doi:10.4271/2007-01-4061

Cited by 35 publications

(18 citation statements)

References 8 publications

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“…92,93 To analyze the behavior of polymeric materials exposed to mixtures of fuels, many studies have used continuous immersion tests. 94,95 The results of polymer degradation are established from structural changes, mass gain, mass loss, dimensional changes and a variation of mechanical properties such as hardness, tensile strength, bending, etc.…”

Section: Effects Of Biodiesel On the Degradation Of Polymeric Materiamentioning

confidence: 99%

The oxidative stability of biodiesel and its impact on the deterioration of metallic and polymeric materials: a review

Zuleta¹,

Baena

Ríos³

et al. 2012

J. Braz. Chem. Soc.

141

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O objetivo deste artigo é analisar as principais questões com relação às estabilidades oxidativa e de armazenamento de biodiesel e como elas afetam diferentes materiais metálicos e poliméricos presentes em peças de automóvel e em estruturas de armazenamento de biodiesel. Adicionalmente, este trabalho apresenta uma revisão das técnicas para a medição da estabilidade oxidativa e para avaliação da degradação de materiais metálicos e poliméricos. Quando biodiesel é oxidado, ocorre uma série de mudanças nas suas propriedades, tais mudanças afetam não só a qualidade do biodiesel, mas também as propriedades dos materiais que estão em contato com o biodiesel. Com a oxidação, propriedades do biodiesel como o índice de acidez, índice de peróxidos e viscosidade aumentam, entretanto os índices de iodo e teor de ésteres metílicos diminuem. As alterações das propriedades químicas e físicas do biodiesel podem afetar a integridade e a estabilidade dos materiais que estão em contato com o combustível. A atual situação relacionada com a estabilidade dos materiais revistos neste artigo poderia limitar o uso extensivo de biodiesel, como tem sido proposto em vários países, e deveria ser considerada como um fenômeno de grande importância na tecnologia de biodiesel.The purpose of this paper is to analyze the main issues concerned with the oxidative and storage stabilities of biodiesel and how they affect different metallic and polymeric materials present in automotive parts and in biodiesel storage structures. In addition, this work presents a review of the techniques used for measuring the oxidative stability and for evaluating the degradation of metallic and polymeric materials. When biodiesel is oxidized, a series of changes in its properties occurs. These changes not only affect biodiesel quality, but also the properties of the materials that are in contact with it. Upon oxidation, biodiesel properties like the acid value, peroxide value and viscosity increase, while the iodine value and the content of methyl esters decrease. The changes in the chemical and physical properties of biodiesel can affect the integrity and stability of the material. The situation reviewed in this paper, which talks about the stability of materials, could limit the extensive use of biodiesel. Such measures have been proposed in several countries, and it is a topic of great importance for biodiesel technology.

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Section: Effects Of Biodiesel On the Degradation Of Polymeric Materiamentioning

confidence: 99%

The oxidative stability of biodiesel and its impact on the deterioration of metallic and polymeric materials: a review

Zuleta¹,

Baena

Ríos³

et al. 2012

J. Braz. Chem. Soc.

141

View full text Add to dashboard Cite

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“…Similarly, higher fluorine content in fluoroelastomers contributes towards the higher resistance against fuel permeation/attack. To date, the least resistant fluoroelastomer evaluated in biodiesel has 64% fluorine content by weight (Thomas et al, 2007). Based on this, biodiesel is said to have sufficient compatibility with fluoroelastomer only if the existing fluoroelastomer has a minimum fluorine content of 64 wt.%.…”

Section: Evaluated Materials In Existing Compatibility Studiesmentioning

confidence: 99%

“…Determines the average corrosion rate by accelerating the metal deterioration by simulating the conditions of interest through immersion study (typically static) ASTM G59 Determines the corrosion rate by monitoring the relationship between the electrochemical potential and current generated between electrically charged electrodes Anisha et al (2011) ASTM D471 Determines the effects on elastomers by accelerating the elastomer degradation by simulating the conditions of interest Thomas et al (2007), McCormick and Terry, (2006), Haseeb et al (2010b) copper, brass and carbon steel by 698%, 262% and 426%, respectively. The higher corrosion rate under ASTM G31 than ASTM G59 nevertheless shows that the corrosion rate of metals in biodiesel increases with duration.…”

Section: Astm G31mentioning

confidence: 99%

Compatibility of Biodiesel Fuel With Metals and Elastomers in Fuel Delivery System of a Diesel Engine

Chandran¹

2016

JOPR

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This article intends to evaluate available literature findings and determine if they are representative of the actual compatibility between fuel delivery materials (FDM) and biodiesel fuel in the physical system. The study will also evaluate current test standards on their effectiveness of representing the physical fuel delivery system. Although the compatibility of a number of materials with biodiesel fuel has been reported, there is a need to establish the exact materials present in the fuel delivery system. This is especially true for elastomers since their resistance is mainly dependent on their elemental compositions. While typical standards such as the ASTM G31 and ASTM D471 for metals and elastomers, respectively are deemed suitable for evaluating the effects of water content, total acid number and oxidised products in biodiesel on FDM degradation based on laboratory immersion studies, none of these standards resemble the actual engine operating conditions such as varying fuel pressure/temperature as well as presence of a wide range of materials in a typical diesel engine's fuel delivery system. As such, findings from existing studies so far are inadequate to conclusively determine the compatibility between FDM and biodiesel fuel in the actual fuel delivery system of a diesel engine.

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“…At room temperature, water is very slightly soluble in conventional diesel fuel (<100 ppm), but has significant solubility in B100 (up to 1200 ppm). (181) Water solubility in B20 is intermediate between these two extremes. The generally higher water levels in biodiesel can exacerbate problems with corrosion, wear, suspension of solids, and microbial growth.…”

Section: Other In-use Issuesmentioning

confidence: 99%

“…(181) While all the elastomers performed well with fresh, pure biodiesel, severe swelling occurred when the elastomers were exposed to fuels that were contaminated with water and/or free fatty acids. In field use applications, such conditions could be encountered, possibly leading to seal leakage or other operational problems.…”

Section: Materials Compatibilitymentioning

confidence: 99%