The weak help the strong: Low-molar-mass organogelators harden bitumen

Langmuir

Volumn 25, Issue 15, 2009, Pages 8400-8403

  Isare, Benjamin ^a,b   Petit, Laurence ^c   Bugnet, Emmanuelle ^a,b   Vincent, Régis ^d   Lapalu, Laurence ^d   Sautet, Philippe ^c   Bouteiller, Laurent ^a,b  

^a SORBONNE UNIVERSITÉ   (France)

^b CNRS   (France)

^c UNIVERSITÉ DE LYON   (France)

^d TOTAL   (France)

Author keywords

[No Author keywords available]

Indexed keywords

DICARBOXYLIC ACID; FIBROUS NETWORKS; HARDNESS AND ELASTIC MODULUS; ORGANOGELATORS; ROOM TEMPERATURE; SELF-ASSEMBLE; THERMOREVERSIBLE GELS;

MECHANICAL PROPERTIES;

BITUMINOUS MATERIALS;

EID: 70350004523     PISSN: 07437463     EISSN: None     Source Type: Journal    
DOI: 10.1021/la804086h     Document Type: Article

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31. The reason that fibers (preferential 1D growth) are formed instead of compact crystals (3D growth) is not known but is probably related to the directionality imposed by the formation of hydrogen bonds between add groups.
32. Contrary to softening temperatures, penetrability measurements show no odd-even alternation. From our previous DFT calculations, this means that during hardness measurements the local structure of diacid monomers remains close to the solid state. Second, the downward trend of the penetrabilities with chain length means that some of the intermolecular interactions (hydrogen bonds and/or van der Waals) between diacid fibers are disrupted upon hardness measurements.
33. At temperatures higher than room temperature but lower than the softening temperature, the relative effect of the diacid is even stronger (Figure S4).