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. 2018 Nov 13;10(11):1264.
doi: 10.3390/polym10111264.

Preparation and Properties of SBS-g-GOs-Modified Asphalt Based on a Thiol-ene Click Reaction in a Bituminous Environment

Jing Li  1   2 , Meizhao Han  3 , Yaseen Muhammad  4   5 , Yu Liu  6 , Zhibin Su  7 , Jing Yang  8 , Song Yang  9 , Shaochan Duan  10
Affiliations

Preparation and Properties of SBS-g-GOs-Modified Asphalt Based on a Thiol-ene Click Reaction in a Bituminous Environment

Jing Li et al. Polymers (Basel). .

Abstract

Styrene-butadiene styrene graphene oxide nanoplatelets (SBS-g-GOs)-modified asphalt was prepared by reacting thiolated GOs (GOs-SH) with SBS in asphalt using a thiol-ene click reaction. The temperature resistance and mechanical properties of asphalts were analyzed by dynamic shear rheology (DSR) and multiple-stress creep-recovery (MSCR) tests, which revealed that an optimum amount of GOs-SH (0.02%) can effectively improve the low temperature and anti-rutting performance of SBS asphalt. Segregation experiments showed that SBS-g-GOs possessed good stability and dispersion in base asphalt. Fluorescence microscopy results revealed that the addition of GOs-SH promoted the formation of SBS network structure. Textural and morphological characterization of GOs-SH and SBS were achieved by Fourier transform infra-red (FT-IR) spectroscopy, energy-dispersive X-ray spectroscopy (EDX), atomic-force microscopy (AFM), X-ray diffraction (XRD), and scanning electron microscopy (SEM), while surface chemical composition was tested by X-ray photoelectron spectroscopy (XPS). Based on textural characterization data, a suitable reaction mechanism was proposed that involved the preferential reaction between GOs-SH and 1,2 C=C of SBS. The currently designed GOs-SH incorporated asphalt via thiol-ene click reaction provides new ideas for the preparation of modified asphalt with enhanced mechanical properties for target-oriented applications.

Keywords: GOs-SH; SBS-g-GOs-modified asphalt; asphalt environment; mechanical properties; textural characterization; thiol-ene click reaction.

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Conflict of interest statement

The authors declare no conflict of interest.

Figures

Figure 1
Figure 1
Schematic representation of synthesis process of GOs-SH.
Figure 2
Figure 2
Proposed mechanism of thiol-ene click reaction of SBS-g-GOs.
Figure 3
Figure 3
Tests results of modified asphalt with different GOs-SH content.
Figure 4
Figure 4
Effect of GOs-SH content on G’ as a function of temperature at 10 Hz.
Figure 5
Figure 5
Effect of GOs-SH content on G′ as a function of shear frequency at 64 °C.
Figure 6
Figure 6
Variation in Tanδ (10 Hz) with temperature with variable GOs-SH content.
Figure 7
Figure 7
Variation in loss modulus G′′ (10 Hz) with temperature at variable GOs-SH content.
Figure 8
Figure 8
Time-strain relation of different asphalt samples at 0.1 KPa.
Figure 9
Figure 9
Time-strain relation of different asphalt samples at 3.2 KPa.
Figure 10
Figure 10
Test results of segregation experiment for various asphalt groups.
Figure 11
Figure 11
FM of SBS at 20 × 20 times (a) and 20 × 40 times (b), and SBS-g-GOs (0.04%) at 20 × 20 times (c) and 20 × 40 times (d).
Figure 11
Figure 11
FM of SBS at 20 × 20 times (a) and 20 × 40 times (b), and SBS-g-GOs (0.04%) at 20 × 20 times (c) and 20 × 40 times (d).
Figure 12
Figure 12
FT-IR spectra of GNPs, GOs-SH, and GOs.
Figure 13
Figure 13
EDX analysis chart of GOs (a) and GOs-SH (b).
Figure 14
Figure 14
XRD patterns of GOs, GNPs, and GOs-SH.
Figure 15
Figure 15
Appearance of GNPs (a,b) and GOs-SH (c,d) analyzed by AFM.
Figure 15
Figure 15
Appearance of GNPs (a,b) and GOs-SH (c,d) analyzed by AFM.
Figure 16
Figure 16
Single piece thickness test of GNPs (a,c) and GOs-SH (b,d) by AFM.
Figure 17
Figure 17
Mechanical properties analysis of GNPs (a) and GOs-SH (b) by AFM.
Figure 18
Figure 18
SEM analysis of GNPs (a–c) and GOs-SH (d–f).
Figure 19
Figure 19
High resolution XPS spectra of GOs-SH of C1s (a) and S2p (b).
Figure 20
Figure 20
XPS spectra of C1s of original SBS-modified asphalt (a) and SBS-g-GOs (0.04% GOs-SH) modified asphalt (b).
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