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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 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.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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The TGA 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-f005: The TGA 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: The influence of PVP-rGO on the thermal stability of epoxy resin coating was characterized by TGA as shown in Figure 5. The TGA curves suggest that the thermal stability of epoxy resin coating could also be greatly improved by addition of PVP-rGO. For example, the temperature at 20% weight loss of neat epoxy resin coating was improved from 284.7 to 322.4 °C with the incorporation of 0.1 wt % PVP-rGO, and reached 356.3 °C in sample containing 0.7 wt % PVP-rGO, almost a 72 °C increase. The results were difficult to be observed in previous works [18,25,26,27]. The result was attributed to the physical barrier effect of the PVP-rGO that was brought about by its ultrahigh aspect ratio, which could create a “tortuous path” for the volatile degradation products. Moreover, the slow degradation of the polymer chains that absorbed at the matrix filler interface may also contribute to the greatly enhanced thermal stability of epoxy resin coating. In addition to this, this improvement in thermal stability could be attributed to the so called “tortuous path” effect of PVP-rGO, which delayed the escape of volatile degradation products and also char formation.


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)

The TGA 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-f005: The TGA 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: The influence of PVP-rGO on the thermal stability of epoxy resin coating was characterized by TGA as shown in Figure 5. The TGA curves suggest that the thermal stability of epoxy resin coating could also be greatly improved by addition of PVP-rGO. For example, the temperature at 20% weight loss of neat epoxy resin coating was improved from 284.7 to 322.4 °C with the incorporation of 0.1 wt % PVP-rGO, and reached 356.3 °C in sample containing 0.7 wt % PVP-rGO, almost a 72 °C increase. The results were difficult to be observed in previous works [18,25,26,27]. The result was attributed to the physical barrier effect of the PVP-rGO that was brought about by its ultrahigh aspect ratio, which could create a “tortuous path” for the volatile degradation products. Moreover, the slow degradation of the polymer chains that absorbed at the matrix filler interface may also contribute to the greatly enhanced thermal stability of epoxy resin coating. In addition to this, this improvement in thermal stability could be attributed to the so called “tortuous path” effect of PVP-rGO, which delayed the escape of volatile degradation products and also char formation.

Bottom Line: 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.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