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. 2018 Jan 15;10(1):75.
doi: 10.3390/polym10010075.

Mechanical Properties and Wear Resistance of Sulfonated Graphene/Waterborne Polyurethane Composites Prepared by In Situ Method

Jianyan Feng  1   2 , Xuechuan Wang  3   4 , Peiying Guo  5 , Yujie Wang  6   7 , Xiaomin Luo  8   9
Affiliations

Mechanical Properties and Wear Resistance of Sulfonated Graphene/Waterborne Polyurethane Composites Prepared by In Situ Method

Jianyan Feng et al. Polymers (Basel). .

Abstract

In order to improve the dispensability of graphene oxide (GO) in waterborne polyurethane (WPU), sulfonated graphene (SGO) with superior dispersity was prepared by modifying graphene oxide with sodium 2-chloroethane sulfonate to introduce hydrophilic sulfonic groups into the structure. SGO/WPU composites were prepared using isophorone diisocyanate (IPDI), polytetramethylene ether glycol (PTMEG 2000), dimethylolpropionic acid (DMPA) and SGO as raw materials. The influence of SGO content on composite properties were investigated. The structure and morphology of SGO and SGO/WPU composites were characterized by infrared spectroscopy, X-ray diffractometry and transmission electron microscopy etc. Their mechanical properties and wear resistance were analyzed as well. The experimental results showed that SGO was successfully grafted onto polyurethane macromolecule by an in situ method and, with the introduction of sulfonic groups, the interfacial compatibility of GO and PU was improved significantly so that SGO evenly dispersed into WPU. The SGO that was grafted onto WPU macromolecules exhibited layered morphology with nanometers in the WPU matrix. With increasing SGO content, the tensile strength and the wear resistance of the film increased, but the addition of more than 0.8 wt % SGO yielded unfavorable results. When the added amount of SGO was 0.8 wt % of WPU, the tensile strength of the composite film was 46.53% higher than that of the blank group, and the wear resistance of the film was remarkably improved, which was due to a strong interaction between the SGO and WPU phases. Thus, the conclusion can be drawn that appropriate amount of SGO addition can enhance the mechanical properties of SGO/WPU composite film.

Keywords: in situ method; mechanical resistance properties; sulfonated grapheme; waterborne polyurethane; wear resistance.

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Conflict of interest statement

The authors declare no conflict of interest.

Figures

Figure 1
Figure 1
Schematic diagram about the synthesis route for SGO/WPU.
Figure 2
Figure 2
Schematic diagrams of sulfonated modified reaction of GO and synthesis of SGO/WPU.
Figure 3
Figure 3
FTIR spectra of the GO (a), SGO (b) and SGO/WPU-3 (c).
Figure 4
Figure 4
XPS spectra of SGO.
Figure 5
Figure 5
X-ray diffraction spectra of GO and SGO.
Figure 6
Figure 6
TEM microphotographs of GO (a,c) and SGO (b,d).
Figure 7
Figure 7
X-ray diffraction spectra of WPU and SGO/WPU.
Figure 8
Figure 8
TGA curves of the SGO, WPU and SGO/WPU nanocomposites.
Figure 9
Figure 9
TEM microphotographs of SGO/WPU.
Figure 10
Figure 10
Mechanical properties of SGO/WPU composites with different SGO contents.
Figure 11
Figure 11
Stand wears and tears of SGO/WPU composites with different SGO contents.
Figure 12
Figure 12
Schematic diagram of SGO enhanced wear-resistant.
See this image and copyright information in PMC

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