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Title: The performance of polymers used in automotive fuel handling applications
Author: McCourt, Mark Peter
ISNI:       0000 0001 3623 3904
Awarding Body: Queen's University Belfast
Current Institution: Queen's University Belfast
Date of Award: 2008
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Multilayer automotive fuel lines are currently being developed in response to stricter environmental legislation governing evaporative emissions. These fuel lines generally have different polymers, an Quter layer (pA 12), a high barrier inner layer (pVdF, THY or PBT) and an adhesive tie layer (modified PA 12) to bond together the outer and inner layers. A range of fuel line polymers were injection moulded and samples immersed in a conventional unleaded fuel, a standard test fuel and fuel components methanol, ethanol and toluene at 20°C. Weight gain, swelling and mechanical property analysis showed minimal change for the fluoropolymers but the tie layer resins exhibited gross swelling and significant reduction in mechanical properties. DMTA analysis showed that this was due to the plasticizing effect ofthe various fluids in the polymer matrices. Elevated temperature immersion studies on nylon 12, PVdF and PBT resins indicated that much higher diffusion coefficients were recorded for the nylon 12 resin, particularly at 600C. The results also showed that the PVdF exhibited the best barrier performance to these fluids, even at 600C. A range of multilayer tubes were manufactured at the University and the barrier performance ofthese tubes were determined using an EMS P-tester, the results confirmed that multilayer tubes with a PVdF inner layer exhibited low permeation values. An FTIR-ATR technique was developed to reduce the time tak.~n to measure the .diffusion of fuel components through polymer films. The results demonstrated that the diffusion coefficients measured using the FTIR-ATR technique correlated well with results obtained using the gravimetric method. The performance of a range of high temperature polymers, PA 4.6, PEl and (pPEIPA) to selected automotive fluids was also investigated. Relatively high absorptions of Fuel C, aggressive water and zinc chloride were recorded for the nylon 4.6. whilst the tensile modulus of the PPEIPA resin was shown to deteriorate significantly upon immersion in these fluids.
Supervisor: Not available Sponsor: Not available
Qualification Name: Thesis (Ph.D.) Qualification Level: Doctoral
EThOS ID:  DOI: Not available