A novel hydroxyl epoxy phosphate monomer enhancing the anticorrosive performance of waterborne Graphene/Epoxy coatings
| Autor: | Obaid ur Rahman, Huimin Dou, Jiheng Ding, Haibin Yu, Wanjun Peng |
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| Rok vydání: | 2018 |
| Předmět: |
Materials science
Scanning electron microscope General Physics and Astronomy 02 engineering and technology 010402 general chemistry 01 natural sciences Dispersant law.invention Contact angle symbols.namesake X-ray photoelectron spectroscopy law Composite material Graphene Surfaces and Interfaces General Chemistry Epoxy 021001 nanoscience & nanotechnology Condensed Matter Physics 0104 chemical sciences Surfaces Coatings and Films Dielectric spectroscopy visual_art symbols visual_art.visual_art_medium 0210 nano-technology Raman spectroscopy |
| Zdroj: | Applied Surface Science. 427:981-991 |
| ISSN: | 0169-4332 |
| DOI: | 10.1016/j.apsusc.2017.08.224 |
| Popis: | Herein, we report the synthesis of a novel hydroxyl epoxy phosphate monomer (PGHEP) as an efficient dispersant for graphene to enhance the compatibility of the graphene in epoxy resin. Raman spectroscopy, Ultraviolet–visible spectroscopy (UV–vis) and X-ray photoelectron spectroscopy (XPS) studies were confirmed the π-π interactions between PGHEP and graphene. Well-dispersed states of PGHEP functionalized graphene (G) sheets in water were analyzed by transmission electron microscopy (TEM), atomic force microscopy (AFM) and scanning electron microscopy (SEM). Further, microstructure of prepared G/waterborne epoxy coatings containing 0.5–1.0 wt.% of PGHEP functionalized G sheets were also observed with the help of SEM and TEM. The PGHEP functionalized G sheets dispersed composite coatings displayed enhanced corrosion resistance compared with pure epoxy resin, these coatings have higher contact angle, lower water absorption as evident from the results of electrochemical impedance spectroscopy (EIS) and salt spray tests. The superior corrosion protection performances of G/epoxy coatings were mainly attributed to the formed passive film from uniformly dispersed PGHEP functionalized G sheets which act as physical barrier on the steel surface. Therefore, this work provides a novel bio-based efficient dispersant for G sheets and an important method for preparing G/waterborne epoxy coatings with superior corrosion resistance properties. |
| Databáze: | OpenAIRE |
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