We characterised, from both a morphological and a rheological point of view, polymer modiWed 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 4wt%, 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 Wller and do not change signiWcantly the viscoelastic behaviour of the base asphalt. On the contrary, at higher polymer concentrations, a swelled polymer-rich phase creates a network that strongly inXuences the viscoelastic properties. In this case the material becomes unstable and tends to give macroscopic phase separation if stored at high temperature without stirring.
|Autori:||POLACCO G; A. MUSCENTE; D. BIONDI AND S. SANTINI|
|Titolo:||Effect of composition on the properties of SEBS modified asphalts|
|Anno del prodotto:||2006|
|Digital Object Identifier (DOI):||10.1016/j.eurpolymj.2005.11.024|
|Appare nelle tipologie:||1.1 Articolo in rivista|