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

From National Research Council Canada

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DOIResolve DOI: https://doi.org/10.1021/ef8002526
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Affiliation
  1. National Research Council of Canada. NRC Institute for Research in Construction
FormatText, Article
Subjectasphalt, bitumen, modification, polyphosphoric acid, models; Roads/Pavement
Abstract
The 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.
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  • Energy & Fuels 22, no. 5 (1 September 2008): 3390–3394.
LanguageEnglish
Peer reviewedYes
NRC numberNRCC 50428
NRC-IRC-19574
NPARC number20377975
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Record identifier4573af28-f393-41c8-b11d-8decc1aec24b
Record created2012-07-24
Record modified2020-04-15
Date modified: