Degradation of carbon-black-filled acrylonitrile butadiene rubber in alternative fuels: Transesterified and hydrotreated vegetable oils
2016 (English)In: Polymer degradation and stability, ISSN 0141-3910, E-ISSN 1873-2321, Vol. 123, 69-79 p.Article in journal (Refereed) PublishedText
The deterioration of acrylonitrile butadiene rubber (NBR), a common sealing material in automobile fuel systems, when exposed to rapeseed biodiesel and hydrotreated vegetable oil (HVO) was studied. The fuel sorption was hindered in HVO-exposed rubber by the steric constraints of bulky HVO molecules, but it was promoted in biodiesel-exposed rubber by fuel-driven cavitation in the NBR and by the increase in diffusivity of biodiesel after oxidation. The absence of a tan δ peak of the bound rubber and the appearance of carbon black particles devoid of rubber suggested that the cavitation was made possible in biodiesel-aged rubber by the detachment of bound rubber from particle surfaces. The HVO-exposed NBR showed a small decrease in strain-at-break due to the migration of plasticizer from the rubber, and a small increase in the Young’s modulus due to oxidative crosslinking. A drastic decrease in extensibility and Payne-effect amplitude of NBR on exposure to biodiesel was explained as being due to the damage caused by biodiesel to the continuous network of bound rubber-carbon black. A decrease in the ZnO crystal size with increasing exposure time suggested that the particles are gradually dissolved in the acidic components of oxidized biodiesel. The Zn2+ cations released from the dissolution of ZnO particles in biodiesel promoted the hydrolysis of the nitrile groups of NBR.
Place, publisher, year, edition, pages
Elsevier, 2016. Vol. 123, 69-79 p.
Acrylonitrile butadiene rubber, Biodiesel, Bound rubber degradation, HVO
Other Chemistry Topics Polymer Chemistry
IdentifiersURN: urn:nbn:se:kth:diva-181471DOI: 10.1016/j.polymdegradstab.2015.11.019ISI: 000368204100007ScopusID: 2-s2.0-84949575368OAI: oai:DiVA.org:kth-181471DiVA: diva2:899632
QC 201602022016-02-022016-02-022016-02-24Bibliographically approved