Effects of ethanol content and temperature on the permeation of fuel through polyamide-12-based pipes
2010 (English)In: Polymer testing, ISSN 0142-9418, E-ISSN 1873-2348, Vol. 29, no 5, 603-608 p.Article in journal (Refereed) Published
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.
Place, publisher, year, edition, pages
elsevier , 2010. Vol. 29, no 5, 603-608 p.
Polyamide-12, ageing, fuel lines, permeation, hydrocarbons, ethanol
Other Materials Engineering
IdentifiersURN: urn:nbn:se:kth:diva-12033DOI: 10.1016/j.polymertesting.2010.03.008ISI: 000279522000011ScopusID: 2-s2.0-77955304821OAI: oai:DiVA.org:kth-12033DiVA: diva2:299739
QC 20100722 Uppdaterad från submitted till published (20110203).2010-02-252010-02-232012-02-23Bibliographically approved