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Polymers 2018, 10(1), 75; https://doi.org/10.3390/polym10010075

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

1
College of Bioresources Chemical and Materials Engineering, Shanxi University of Science & Technology, Xi’an 710021, Shanxi, China
2
National Demonstration Center for Experimental Light Chemistry Engineering Education, Shanxi University of Science & Technology, Xi’an 710021, Shanxi, China
3
School of Arts and Sciences, Shanxi University of Science & Technology, Xi’an 710021, Shanxi, China
*
Author to whom correspondence should be addressed.
Received: 14 November 2017 / Revised: 8 January 2018 / Accepted: 10 January 2018 / Published: 15 January 2018
(This article belongs to the Special Issue Applications of Graphene and Fullerene Nanocomposites)
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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. View Full-Text
Keywords: sulfonated grapheme; waterborne polyurethane; in situ method; mechanical resistance properties; wear resistance sulfonated grapheme; waterborne polyurethane; in situ method; mechanical resistance properties; wear resistance
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This is an open access article distributed under the Creative Commons Attribution License which permits unrestricted use, distribution, and reproduction in any medium, provided the original work is properly cited. (CC BY 4.0).
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Feng, J.; Wang, X.; Guo, P.; Wang, Y.; Luo, X. Mechanical Properties and Wear Resistance of Sulfonated Graphene/Waterborne Polyurethane Composites Prepared by In Situ Method. Polymers 2018, 10, 75.

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