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Effects of ethanol content and temperature on the permeation of fuel through polyamide-12-based pipes
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- Kallio, Kai J., 1967- (author)
- Volvo Car Corporation, Polymer Centre
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- Hedenqvist, Mikael S. (author)
- KTH,Polymera material
- (creator_code:org_t)
- elsevier, 2010
- 2010
- English.
- In: Polymer testing. - : elsevier. - 0142-9418 .- 1873-2348. ; 29:5, s. 603-608
- Journal article (peer-reviewed)
Abstract
Subject headings
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- A new test method has been developed which enables the fuel permeation properties of polyamide-12 (PA-12) - based pipes to be investigated. Fuel lines were exposed to circulating fuel with equal volume contents of toluene, isooctane and 0, 25 or 85 vol.% ethanol for up to 6 months at 60-110 degrees C. The pipes were either of a single PA12-layer or a multi-layer type, the latter having a poly(vinylidene fluoride) barrier layer between two PA12 sections. With a Thwing-Albert cup attached to the fuel line, it was possible to expose a pipe-section to surrounding air running in a separate pipe loop at a controlled flow-rate. Gas/vapour samples were collected from this loop using a syringe and, subsequently, analysed with a flame ionization detector. It was observed in the case of multi-layer pipes that the presence of ethanol increased the permeability (average values) of the "total" fuel as well as of the individual hydrocarbons. In addition, the 60 degrees C fuel permeability (85 vol.% ethanol) increased after a high temperature (110 degrees C peak) cycle, whereas the ethanol-free fuel flux seemed to decrease.
Subject headings
- TEKNIK OCH TEKNOLOGIER -- Materialteknik -- Annan materialteknik (hsv//swe)
- ENGINEERING AND TECHNOLOGY -- Materials Engineering -- Other Materials Engineering (hsv//eng)
Keyword
- Polyamide-12
- ageing
- fuel lines
- permeation
- hydrocarbons
- ethanol
- Other materials science
- Övrig teknisk materialvetenskap
Publication and Content Type
- ref (subject category)
- art (subject category)
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