Modification of Alkyl Group Terminated Hyperbranched Polyester on Paving Epoxy Asphalt

Epoxy asphalt is a kind of high performance asphalt material that has been widely used in steel deck pavement. However, because high modulus and low toughness also exist in thermosetting epoxy asphalt mixture at low temperature, crack would be initiated by innerstress caused by temperature change. Hyperbranched polyester (HBP) is a kind of toughness modifier with low viscosity and high reactivity for thermosetting materials. It can effectively improve the toughness of thermosetting epoxy asphalt. However, hydroxyl end groups of HBP would accelerate the reaction rate of epoxy asphalt and disturb the phase dispersion between resin phase and asphalt phase. Therefore, it is necessary to modify the hydroxyl end groups of HBP as inert alkyl end groups to avoid its rapid curing reaction with epoxy resin. And by this, the excellent effects of HBP, such as viscosity reduction, compatibility improvement and toughening on thermosetting materials can be obviously observed in the HBP modified epoxy asphalt. Adding different alkyl end groups modified HBP into epoxy asphalt, not only the viscosity of epoxy asphalt can be reduced, but also the toughness of cured epoxy asphalt can be improved significantly.

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  • English

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  • Accession Number: 01667264
  • Record Type: Publication
  • Files: TRIS
  • Created Date: Feb 15 2018 3:54PM