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. 2019 Apr 11;11(4):665.
doi: 10.3390/polym11040665.

Preparation of Octadecyl Amine Grafted over Waste Rubber Powder (ODA-WRP) and Properties of Its Incorporation in SBS-Modified Asphalt

Meizhao Han  1 , Xiang Zeng  2 , Yaseen Muhammad  3   4 , Jing Li  5   6 , Jing Yang  7 , Song Yang  8 , Yunhao Wei  9 , Fei Meng  10
Affiliations

Preparation of Octadecyl Amine Grafted over Waste Rubber Powder (ODA-WRP) and Properties of Its Incorporation in SBS-Modified Asphalt

Meizhao Han et al. Polymers (Basel). .

Abstract

Through a covalent grafting reaction, octadecyl amine (ODA) was grafted on the surface of waste rubber powder (WRP) to obtain an ODA-WRP modifier, which was in turn compounded with a styrene-butadiene-styrene block copolymer (SBS) to prepare ODA-WRP/SBS-modified asphalt. The three major indicators (i.e., dynamic shear rheometer (DSR), multi-stress creep recovery (MSCR), and separation tests) showed that 1-ODA-WRP effectively improved the complex shear modulus (G*), elastic Modulus (G'), and loss modulus (G″) by 36.47%, 40.57%, and 34.77% (64 °C and 10 Hz), respectively, as compared to pristine SBS-modified asphalt. Fluorescence microscopy (FM) results concluded that the enhancement in mechanical properties was accredited to the better compatibility of various components in asphalt and establishment of network structure between ODA-WRP and SBS in ODA-WRP/SBS-modified asphalt. Fourier infrared spectroscopy (FT-IR) and scanning electron microscope (SEM) analyses confirmed the successful synthesis of ODA-WRP. This study could be of great help in synthesizing ODA-WRP asphalt modified with SBS for highways and construction applications.

Keywords: composite network structure; covalent grafting reaction; lipophilicity; mechanical properties; waste rubber powder.

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Conflict of interest statement

The authors declare no conflict of interest.

Figures

Figure 1
Figure 1
Preparation process of octadecyl amine grafted over waste rubber powder (ODA-WRP).
Figure 2
Figure 2
Preparation process of different kinds of WRP/styrene-butadiene-styrene (SBS)-modified asphalt.
Figure 3
Figure 3
Effect of different WRPs on the performance of WRP/SBS-modified asphalt.
Figure 4
Figure 4
Variation in G* with: (a) frequency at a constant temperature of 64 °C and (b) temperature at constant frequency of 10 Hz for different kinds of ODA-WRP asphalt.
Figure 5
Figure 5
Variation in G′ with: (a) frequency at 64 °C and (b) temperature at 10 Hz for different kinds of ODA-WRP asphalt.
Figure 6
Figure 6
Variation in G″ with: (a) frequency at 64 °C and (b) temperature at 10 Hz for different kinds of ODA-WRP.
Figure 7
Figure 7
Time-strain relation of different asphalt samples at 82 °C under: (a) 0.1 KPa and (b) 3.2 KPa.
Figure 8
Figure 8
Segregation test results for various asphalt samples.
Figure 9
Figure 9
FM images of WRP at 200× (a) and 400× (b); 1-ODA-WRP at 200× (c) and 400× (d); and 3-ODA-WRP at 200× (e) and 400× (f).
Figure 10
Figure 10
Formation mechanism of the ODA-WRP/SBS network structure.
Figure 11
Figure 11
Swelling mechanism of different types of WRP.
Figure 12
Figure 12
FT-IR spectra of WRP, 1-ODA-WRP, 2-ODA-WRP, and 3-ODA-WRP.
Figure 13
Figure 13
The energy dispersive spectroscopy (EDS) analyses of (a) WRP, (b) 1-ODA-WRP, and (c) 3-ODA-WRP.
Figure 13
Figure 13
The energy dispersive spectroscopy (EDS) analyses of (a) WRP, (b) 1-ODA-WRP, and (c) 3-ODA-WRP.
Figure 14
Figure 14
SEM analysis of WRP (a,b), 1-ODA-WRP (c,d), and 3-ODA-WRP (e,f).
Figure 14
Figure 14
SEM analysis of WRP (a,b), 1-ODA-WRP (c,d), and 3-ODA-WRP (e,f).
See this image and copyright information in PMC

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