Effect of composition on the properties of SEBS modified asphalts |
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Authors: | Giovanni Polacco Antonio Muscente Simona Santini |
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Institution: | a Dipartimento di Ingegneria Chimica, Università di Pisa, Via Diotisalvi 2, 56126 Pisa, Italy b Stazione Zoologica “A. Dohrn”, Villa Comunale, 80121 Napoli, Italy |
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Abstract: | We characterised, from both a morphological and a rheological point of view, polymer modified asphalts prepared by the addition of styrene-(ethylene-co-butylene)-styrene block copolymer to a soft base asphalt. It was found that, even if the two components showed poor compatibility and interfacial adhesion, storage-stable mixtures could be obtained if the polymer content was maintained below about 4 wt%, with respect to the total mass. In this case, the more polar part of asphalt stabilises the dispersed polymer-rich domains, which act similarly to a filler and do not change significantly the viscoelastic behaviour of the base asphalt. On the contrary, at higher polymer concentrations, a swelled polymer-rich phase creates a network that strongly influences the viscoelastic properties. In this case the material becomes unstable and tends to give macroscopic phase separation if stored at high temperature without stirring. |
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Keywords: | Polymer modified asphalts Styrene-(ethylene-co-butylene)-styrene (SEBS) Rheology |
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