Effet de la microstructure, de la macrostructure et de la composition des copolymères à base de styrène et butadiène sur les propriétés de bitumes modifiés

Abstract : This study is focused to the modification of a mexican asphalt (AC-20 Salamanca) with styrene-butadiene copolymers which have different molecular characteristics by using a hot-mix process, and the obtained polymer-modified asphalts (PMA) were characterized by both rheological tests and fluorescence microscopy. The results show that for any concentration of polymer, the PMA may exhibit either emulsion-like or macronetwork morphology. It was found that the composition and block size of the SBS have strong effect on the ordering of the polystyrene and polybutadiene microdomains, and therefore they have strong effect on the morphology and rheological behavior of the PMA. It was established that the microstructure has strong effect on the swelling of polymer with maltenes but it has weak effect on the rheological behavior of the PMA because their rheological properties have similar behavior up to 40 % of vinyl units. Therefore, the molecular characteristics of polymer is critical as for the morphology as for the rheological behavior of the PMA. The rheological data at low temperature of the PMA had weIl fitting to the Maxwell-Voigt's model to predict the creep response of the material and to determine their activation energy. The rheological data at high temperature followed adequately the Palierne's model which regards as the PMA as an emuision-like material and uses the interfacial tension as the only adjustable parameter.
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Theses
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http://docnum.univ-lorraine.fr/prive/INPL_T_2005_ROJAS_GARCIA_J_M.pdf
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https://hal.univ-lorraine.fr/tel-01750000
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Submitted on : Thursday, March 29, 2018 - 12:35:38 PM
Last modification on : Thursday, January 31, 2019 - 1:27:49 AM

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José-Manuel Rojas-Garcia. Effet de la microstructure, de la macrostructure et de la composition des copolymères à base de styrène et butadiène sur les propriétés de bitumes modifiés. Alimentation et Nutrition. Institut National Polytechnique de Lorraine, 2005. Français. ⟨NNT : 2005INPL059N⟩. ⟨tel-01750000⟩

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