Properties of paving epoxy asphalt with epoxy-terminated hyperbranched polyester. Issue 1 (2nd January 2022)

• Record Type: Journal Article
• Authors: Xu, Peijun; Du, Xiaoming; Cong, Peiliang; Zhou, Zhenjun
• Is Part Of: Road materials and pavement design. Volume 23:Issue 1(2022)
• Page Start: 234
• Page End: 246
• Publication Date: 2022-01-02
• Subjects: Epoxy asphalt -- hyperbranched polymer -- viscosity reduction -- toughness -- compatibility; Road materials -- Periodicals; Highway engineering -- Periodicals; Pavements -- Design and construction -- Periodicals; 625.805
• DOI: 10.1080/14680629.2020.1826342
• Languages: English
• ISSNs: 1468-0629

Abstract

ABSTRACT: Epoxy asphalt is a high performance pavement material, but the poor toughness of epoxy asphalt at low temperature has limited its utilisation. Hyperbranched polyester (HBP) is a spherical polymer with highly branched structures, which can effectively improve the toughness of epoxy asphalt. However, hydroxyl-terminated HBP would accelerate the reaction rate of epoxy asphalt because of the rapid reaction between hydroxyl groups of HBP and epoxy groups of resin. We modified the hydroxyl end groups of HBP as epoxy end groups to avoid its curing reaction with epoxy resin and further reduce the viscosity of epoxy asphalt. Epoxy-terminated HBP also has good compatibility with epoxy resin to improve phase structure uniformity of epoxy asphalt. Moreover, with the help of hyperbranched structure, epoxy-terminated HBP still can improve the toughness of epoxy asphalt, which can be proved by the fracture surface morphology, mechanical properties, and dynamic thermomechanical properties.