Electrospinning Strategy for the Preparation of Nanoporous Fibers as Modifier for Inducing  The Network Structure and Enhancing Mechanical Properties of Sbs Modified Asphalt

Abstract

Electrospinning is used to control the interface structure of macro-polyacrylonitrile (PAN) fibers, and nanoporous fibers (E-PAN) which possess enhanced adhesion and interface effects. Herein, E-PAN was prepared via electrospinning and was in turned incorporated into styrene-butadiene-styrene (SBS) asphalt to prepare PAN modified asphalt and the effect of E-PAN addition on the performance of modified asphalt was explored. FT-IR, XRD, SEM, AFM and AFM tests confirmed that E-PAN has a highly rough nanoporous skeleton without any prominent structural damage during the preparation process. The three major indexes, DSR, MSCR and TGA tests results showed that E-PAN modified asphalt exhibited excellent viscoelasticity, and anti-rutting and anti-fatigue properties and high thermal stability (THRI of 192.7 °C). FT-IR test of the four components of modified asphalt confirmed that E-PAN chemically crosslinked with saturates and aromatics in the base asphalt and SBS, which resulted in a uniform and well-developed network structure. In addition, BET and FM results also confirmed that E-PAN got fully swollen a similar swelling behavior to SBSin the base asphalt, and hence helped SBS to form an excellent network structure in asphalt. E-PAN played the important role of stress buffer, mutual entanglement and good thermal insulation inside the asphalt.

Keywords: mechanical properties, electrospinning, modified asphalt, four components of asphalt, viscoelastic properties