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.

摘要

环氧沥青是一种高性能的路面材料，但环氧沥青低温韧性差限制了其应用。超支化聚酯（HBP）是一种具有高度支化结构的球形聚合物，可有效提高环氧沥青的韧性。然而，羟基封端的HBP会加快环氧沥青的反应速度，因为HBP的羟基与树脂的环氧基反应迅速。我们将 HBP 的羟基端基改性为环氧端基，以避免其与环氧树脂发生固化反应，进一步降低环氧沥青的粘度。环氧封端的HBP还与环氧树脂具有良好的相容性，可提高环氧沥青的相结构均匀性。此外，在超支化结构的帮助下，