Ionic pairs in PPA-modified bitumen: insights from model compounds

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DOIResolve DOI: http://doi.org/10.1021/ef8002526
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TypeArticle
Journal titleEnergy & Fuels
Volume22
Issue5
Pages33903394; # of pages: 5
Subjectasphalt, bitumen, modification, polyphosphoric acid, models; Roads/Pavement
AbstractThe reaction between polyphosphoric acid (PPA) and bitumen is ill understood. To help define possible reactions, model compounds, isoquinoline and 1-methyl-2-quinolinone, were reacted with PPA. Both compounds formed salts with PPA. An infrared study of the salts revealed that PPA releases a terminal proton, as opposed to an internal one, and that with isoquinoline, the charges of the ionic pair are localized, but stabilized by bound water. With 1-methyl-2-quinolinone, the charges are delocalized and stabilized by resonance. This study demonstrates that ionic pairs need an environment of high dielectric constant to form in bitumen.
Publication date
LanguageEnglish
AffiliationNRC Institute for Research in Construction; National Research Council Canada
Peer reviewedYes
NRC number50428
19574
NPARC number20377975
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Record identifier4573af28-f393-41c8-b11d-8decc1aec24b
Record created2012-07-24
Record modified2016-05-09
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