Abstract
The thermal storage stability of styrene–butadiene–styrene (SBS) modified bitumen is not very well since phase separation would happen under high temperature. To solve this problem, 4,4′-diphenylmethane diisocyanate (MDI) is incorporated into bitumen/SBS blend, which could induce the formation of urethane/urea structure with large scale by chemical reaction between MDI and polar groups. For a comparison, Poly (ethylene glycol) (PEG) with hydroxyl group as substitute for partial SBS to study the effect of chemical reactivity on the structure and property of bituminous materials. Optical microscopy, rheological and DMA results indicate that the thermal stability and rutting resistance of bituminous materials are enhanced by MDI addition. This enhancement is more pronounced in the blend with existence of PEG, whose reason relates to the different chemical reactivity of hydroxyl group in different blends.
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