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Monday, March 23, 2009: 2:20 PM
C205 (Georgia World Congress Center)
Conductive Pigments Based on Polypyrrole/Non-Conducting Particulates Victoria Johnston Gelling*, Christopher Vetter,
Subramanyam V Kasi Somayajula and Xiaoning Qi North Dakota State University
1735 NDSU Research Park Drive, Dept. CPM
Fargo, ND 58105, USA
701-231-8027
701-231-8439
V.J.Gelling@ndsu.edu
Electroactive Conducting Polymers (ECPs) have been examined as possible replacements for hazardous corrosion inhibitors such as hexavalent chromium. However, due to relatively poor mechanical properties and issues with processability, the use of ECPs has often proven challenging. The current studies examined in this research include polypyrrole (PPy) synthesized through an aqueous chemical oxidation process in the presence of various particulates with the end goal of producing a thin layer of PPy on the surface of the particulate. The hybrid particles resulting from the synthesis are incorporated into coatings at varying pigment volume concentration to determine when the percolation threshold is met, therefore creating a conductive coating. Conducting atomic force microscopy (CAFM), scanning electron microscope (SEM), and X-ray Photoelectron Spectroscopy (XPS) are utilized during the study to better understand the nature of the polypyrrole hybrids. Additionally, the coatings are studied via multiple electrochemical techniques such as electrochemical impedance spectroscopy (EIS), corrosion potential measurements, scanning vibrating electrode technique (SVET), and linear polarization.
Subramanyam V Kasi Somayajula and Xiaoning Qi North Dakota State University
1735 NDSU Research Park Drive, Dept. CPM
Fargo, ND 58105, USA
701-231-8027
701-231-8439
V.J.Gelling@ndsu.edu
Electroactive Conducting Polymers (ECPs) have been examined as possible replacements for hazardous corrosion inhibitors such as hexavalent chromium. However, due to relatively poor mechanical properties and issues with processability, the use of ECPs has often proven challenging. The current studies examined in this research include polypyrrole (PPy) synthesized through an aqueous chemical oxidation process in the presence of various particulates with the end goal of producing a thin layer of PPy on the surface of the particulate. The hybrid particles resulting from the synthesis are incorporated into coatings at varying pigment volume concentration to determine when the percolation threshold is met, therefore creating a conductive coating. Conducting atomic force microscopy (CAFM), scanning electron microscope (SEM), and X-ray Photoelectron Spectroscopy (XPS) are utilized during the study to better understand the nature of the polypyrrole hybrids. Additionally, the coatings are studied via multiple electrochemical techniques such as electrochemical impedance spectroscopy (EIS), corrosion potential measurements, scanning vibrating electrode technique (SVET), and linear polarization.