Additive Effects of Aromatic Oil and Styrene–Butadiene–Styrene Triblock Copolymer Upon Feedstock Recycling of Degraded Polymer Modified Asphalt

Abstract

Additive effects of aromatic oil and styrene–butadiene–styrene triblock copolymer (SBS) upon feedstock recycling of degraded polymer modified asphalt (MS) are discussed from the yields of four constituents separated by solvent extraction, the average molecular weight of four constituents, physical properties (softening point and penetration), and the ratio of radical content in the degraded and recycled MS. For the recycling process of MS with aromatic oil only, the additive amount of aromatic oil should minimize because polymerization of the asphalt constituents was enhanced with the increase of the additive amount of aromatic oil. For the recycling process of the degraded MS with both aromatic oil and SBS, the required amount of aromatic oil in order to penetrate SBS into the asphalt constituent in the degraded MS was necessary because polymerization of the asphalt constituents was inhibited with the increase of the additive amount of aromatic oil.