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Long-term performance of a polyamide-12-based fuel line with a thin poly(ethylene-co-tetrafluoroethylene) (ETFE) inner layer exposed to bio- and petroleum diesel
KTH, School of Engineering Sciences in Chemistry, Biotechnology and Health (CBH), Fibre- and Polymer Technology.
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2018 (English)In: Polymer degradation and stability, ISSN 0141-3910, E-ISSN 1873-2321, Vol. 156, p. 170-179Article in journal (Refereed) Published
Abstract [en]

The long-term performance of a polyamide-12 (PA12)-based (bio)diesel fuel line/pipe with a thin poly(ethylene-co-tetrafluoroethylene) (ETFE) inner layer was investigated in “close to real” and high-temperature isothermal conditions with fuel on the inside and air on the outside of the pipe. The inner carbon-black-containing ETFE layer resisted fuel attack, as revealed by the small fuel uptake, the very low degree of oxidation, and the unchanged electrical conductivity, glass transition and melting behaviour. The properties of the ETFE layer remained the same after exposure to all the fuel types tested (petroleum diesel, biodiesel and a blend of 80% diesel with 20% biodiesel). Because of the presence of the ETFE layer on the inside, the fuel pipe experienced noticeable changes only in the outer PA12 pipe layer through migration of plasticizer, annealing and slight oxidation. The evaporation of plasticizer was found to be diffusion-controlled and it led to an increase in the glass transition temperature of PA12 by 20 °C. This, together with a small annealing-induced increase in crystallinity, resulted in a stiffer and stronger pipe with an increase in the flexural/tensile modulus and strength. The oxidation of PA12 remained at a low level and did not lead to an embrittled pipe during the simulated lifetime of the vehicle. This study reveals that fluoropolymers have a great potential for use as fuel-contacting materials in “demanding” motor vehicle fuel line systems. 

Place, publisher, year, edition, pages
Elsevier Ltd , 2018. Vol. 156, p. 170-179
Keywords [en]
Ageing, Biodiesel, Diesel, Fuel pipe, Plasticizer loss, Poly(ethylene-co-tetrafluoroethylene), Polyamide, Carbon black, Diesel fuels, Ethylene, Fluorine containing polymers, Gasoline, Glass, Oxidation, Plasticizers, Polyamides, Reinforced plastics, Electrical conductivity, Fuel pipes, High temperature, Isothermal conditions, Long term performance, Tetrafluoroethylene, Glass transition
National Category
Environmental Engineering
Identifiers
URN: urn:nbn:se:kth:diva-236649DOI: 10.1016/j.polymdegradstab.2018.09.003ISI: 000448091400017Scopus ID: 2-s2.0-85053044298OAI: oai:DiVA.org:kth-236649DiVA, id: diva2:1262851
Funder
Swedish Energy Agency, 32519-3
Note

Export Date: 22 October 2018; Article; CODEN: PDSTD; Correspondence Address: Wei, X.-F.; KTH Royal Institute of Technology, School of Engineering Sciences in Chemistry, Biotechnology and Health, Fibre and Polymer TechnologySweden; email: xinfengw@kth.se; Funding details: 32519-3; Funding text: The financial support from the Swedish Energy Authority (project no. 32519-3 ), Volvo Cars AB (Göteborg, Sweden) and Scania CV AB (Södertälje, Sweden) is gratefully acknowledged. QC 20181113

Available from: 2018-11-13 Created: 2018-11-13 Last updated: 2018-11-13Bibliographically approved

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Wei, Xin-FengGedde, Ulf WHedenqvist, Mikael S.

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