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Mechanical and anticorrosive properties of graphene/epoxy resin composites coating prepared by in-situ method.

Zhang Z, Zhang W, Li D, Sun Y, Wang Z, Hou C, Chen L, Cao Y, Liu Y - Int J Mol Sci (2015)

Bottom Line: The graphene nanosheets-based epoxy resin coating (0, 0.1, 0.4 and 0.7 wt %) was prepared by a situ-synthesis method.The effect of polyvinylpyrrolidone/reduced graphene oxide (PVP-rGO) on mechanical and thermal properties of epoxy resin coating was investigated using nanoindentation technique and thermogravimetric analysis, respectively.The results showed also that the Rrcco (ca. 0.3 mm/year) of graphene nanosheets-based epoxy resin coating was far lower than neat epoxy resin (1.3 mm/year).

View Article: PubMed Central - PubMed

Affiliation: Research Center for Engineering Technology of Polymeric Composites of Shanxi Province, North University of China, Taiyuan 030051, China. zhangY@163.com.

ABSTRACT
The graphene nanosheets-based epoxy resin coating (0, 0.1, 0.4 and 0.7 wt %) was prepared by a situ-synthesis method. The effect of polyvinylpyrrolidone/reduced graphene oxide (PVP-rGO) on mechanical and thermal properties of epoxy resin coating was investigated using nanoindentation technique and thermogravimetric analysis, respectively. A significant enhancement (ca. 213% and 73 °C) in the Young modulus and thermal stability of epoxy resin coating was obtained at a loading of 0.7 wt %, respectively. Furthermore, the erosion resistance of graphene nanosheets-based epoxy resin coating was investigated by electrochemical measurement. The results showed also that the Rrcco (ca. 0.3 mm/year) of graphene nanosheets-based epoxy resin coating was far lower than neat epoxy resin (1.3 mm/year). Thus, this approach provides a novel route for improving erosion resistance and mechanical-thermal stability of polymers coating, which is expected to be used in mechanical-thermal-corrosion coupling environments.

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Load-displacement curves of GNS-based epoxy resin coating with different contents of (A) 0; (B) 0.1 wt %; (C) 0.4 wt %; and (D) 0.7 wt %.
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ijms-16-02239-f003: Load-displacement curves of GNS-based epoxy resin coating with different contents of (A) 0; (B) 0.1 wt %; (C) 0.4 wt %; and (D) 0.7 wt %.

Mentions: Figure 3 shows loading-unloading curves of neat epoxy resin coating and GNS-based epoxy resin coating. These curves were obtained from the nanoindentation test with a normal force of 800 mN. By increasing PVP-rGO content, nanoindentation curves shifted to the left and maximum depth reduced due to the increasing hardness. The Young’s modulus and hardness was concluded in Table 1. It clearly showed that modulus and hardness of GNS-based epoxy resin coating increased with increases in PVP-rGO content. For instance, the hardness and elastic modulus of GNS-based epoxy resin coating (0.7 wt %) was improved equaling 294% and 213% compared with that of neat epoxy resin coating, respectively. These results were attributed to the fact that graphene is the strongest material known to man [18,19]. Modulus and stiffness have a direct relationship and growth in stiffness will result in a higher modulus. Hardness has been defined as the resistance of material surface against the deformation caused by normal force, and elastic modulus is the ability of the material to recover its former shape. The indenter interacted with more graphene sheets by increasing content of PVP-rGO. So, the material resists more against the deformation caused by normal load and shows better elastic recovery. Consequently, hardness and modulus showed huge improvement with increases in PVP-rGO content. However, the huge improvement of hardness and elastic modulus (i.e., 294% and 213%) was firstly reported [6,7,8,9,10,11,20]. The good dispersion and adhesion of PVP-rGO in epoxy resin matrix also played an important role.


Mechanical and anticorrosive properties of graphene/epoxy resin composites coating prepared by in-situ method.

Zhang Z, Zhang W, Li D, Sun Y, Wang Z, Hou C, Chen L, Cao Y, Liu Y - Int J Mol Sci (2015)

Load-displacement curves of GNS-based epoxy resin coating with different contents of (A) 0; (B) 0.1 wt %; (C) 0.4 wt %; and (D) 0.7 wt %.
© Copyright Policy
Related In: Results  -  Collection

License
Show All Figures
getmorefigures.php?uid=PMC4307360&req=5

ijms-16-02239-f003: Load-displacement curves of GNS-based epoxy resin coating with different contents of (A) 0; (B) 0.1 wt %; (C) 0.4 wt %; and (D) 0.7 wt %.
Mentions: Figure 3 shows loading-unloading curves of neat epoxy resin coating and GNS-based epoxy resin coating. These curves were obtained from the nanoindentation test with a normal force of 800 mN. By increasing PVP-rGO content, nanoindentation curves shifted to the left and maximum depth reduced due to the increasing hardness. The Young’s modulus and hardness was concluded in Table 1. It clearly showed that modulus and hardness of GNS-based epoxy resin coating increased with increases in PVP-rGO content. For instance, the hardness and elastic modulus of GNS-based epoxy resin coating (0.7 wt %) was improved equaling 294% and 213% compared with that of neat epoxy resin coating, respectively. These results were attributed to the fact that graphene is the strongest material known to man [18,19]. Modulus and stiffness have a direct relationship and growth in stiffness will result in a higher modulus. Hardness has been defined as the resistance of material surface against the deformation caused by normal force, and elastic modulus is the ability of the material to recover its former shape. The indenter interacted with more graphene sheets by increasing content of PVP-rGO. So, the material resists more against the deformation caused by normal load and shows better elastic recovery. Consequently, hardness and modulus showed huge improvement with increases in PVP-rGO content. However, the huge improvement of hardness and elastic modulus (i.e., 294% and 213%) was firstly reported [6,7,8,9,10,11,20]. The good dispersion and adhesion of PVP-rGO in epoxy resin matrix also played an important role.

Bottom Line: The graphene nanosheets-based epoxy resin coating (0, 0.1, 0.4 and 0.7 wt %) was prepared by a situ-synthesis method.The effect of polyvinylpyrrolidone/reduced graphene oxide (PVP-rGO) on mechanical and thermal properties of epoxy resin coating was investigated using nanoindentation technique and thermogravimetric analysis, respectively.The results showed also that the Rrcco (ca. 0.3 mm/year) of graphene nanosheets-based epoxy resin coating was far lower than neat epoxy resin (1.3 mm/year).

View Article: PubMed Central - PubMed

Affiliation: Research Center for Engineering Technology of Polymeric Composites of Shanxi Province, North University of China, Taiyuan 030051, China. zhangY@163.com.

ABSTRACT
The graphene nanosheets-based epoxy resin coating (0, 0.1, 0.4 and 0.7 wt %) was prepared by a situ-synthesis method. The effect of polyvinylpyrrolidone/reduced graphene oxide (PVP-rGO) on mechanical and thermal properties of epoxy resin coating was investigated using nanoindentation technique and thermogravimetric analysis, respectively. A significant enhancement (ca. 213% and 73 °C) in the Young modulus and thermal stability of epoxy resin coating was obtained at a loading of 0.7 wt %, respectively. Furthermore, the erosion resistance of graphene nanosheets-based epoxy resin coating was investigated by electrochemical measurement. The results showed also that the Rrcco (ca. 0.3 mm/year) of graphene nanosheets-based epoxy resin coating was far lower than neat epoxy resin (1.3 mm/year). Thus, this approach provides a novel route for improving erosion resistance and mechanical-thermal stability of polymers coating, which is expected to be used in mechanical-thermal-corrosion coupling environments.

Show MeSH
Related in: MedlinePlus