Abstract
Poly (styrene-butadiene-styrene) block copolymer (SBS) is the most common thermoplastic elastomer (TPE) used for modified asphalt. The unsaturated double bond of its polybutadiene block is prone to crosslinking and aging, which affects the performance and service life of modified asphalt. To solve this problem, acrylate soft monomers are used to replace butadiene, and hard monomers with high glass transition temperature (<I>T</I><sub>g</sub>) are used to replace styrene. Such new TPEs are designed to improve the chemical stability of the soft segment and improve the modification high and low temperature properties of asphalt. Firstly, the monomers used for flexible block and rigid block are screened out based on monomer price and <I>T</I><sub>g</sub>, and the polymerization method of each monomer is analyzed. Then, the polymerization methods and topological structures of block-type TPE prepared by rigid and flexible monomers are summarized and compared. The most suitable topological structure is linear or comb type. For linear TPE, a living polymerization method should be used, and each block is selected for copolymerization with monomers to adjust <I>T</I><sub>g</sub>. For comb-type TPE, the proposed synthetic route is: firstly prepare the telechelic graft chain, and then carry out free radical copolymerization. Finally, several schemes for the preparation of telechelic graft chains are proposed. A synthesis scheme of polyacrylate thermoplastic elastomer is proposed by summarizing the existing monomers, polymerization methods and initiator molecular structures, which provides a guideline for replacing SBS and for improving the comprehensive performance and service life of modified asphalt.
Sign-in/Register to access full text options 
Free) 
Talk to us
Join us for a 30 min session where you can share your feedback and ask us any queries you have
Schedule a call
