Synthesis and characterization of polypyrrole/montmorillonite and polypyrrole/polypropylene compdsites

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2007

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Börüban, Çetin

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In this study, organo-montmorillonite (OMMT) nanocomposites containing 1%, 5%, 10% and 15% OMMT were prepared by in situ intercalative oxidative polymerization of pyrrole in the presence of OMMT. Thermal and morphological properties of the Polypyrrole(PPy)/OMMT nanocomposites were investigated by Thermal Gravimetric Analysis (TGA), X-ray Diffraction Analysis (XRD) and Scanning Electron Microscope (SEM). Electrical conductivities of composites were measured by four probe technique. Formation of PPy and its incorporation in PPy/OMMT composites were confirmed by FTIR analysis. TGA results showed that PPy/OMMT composites have outstanding thermal stability compared to that of PPy. XRD analysis revealed intercalation of PPy in the OMMT lamelles. Scanning electron micrographs demonstrated that the morphology of the PPy/OMMT nanocomposites differ slightly from that of the clay, since the modification of PPy was not significant in flaky structure of OMMT nanoparticles. Conductivity values of PPy/OMMT composites were found in the order of 10-3S/cm. Since PPy has poor processibility, Polypropylene(PP)/PPy composites were prepared in the composition range of 2-20 % PPy. Mechanical properties were investigated by tensile tests. Electrical conductivities were measured by four probe technique. Morphological characterizations were made by SEM. Young’s Modulus of PPy/PP composites increased with increasing PPy content, and addition of 2 wt % PPy to PP resulted in a dramatic decrease in the tensile strain at break of the material. Also by addition of 2 wt % PPy to PP, the tensile strength of material decreased and further increase in PPy content, tensile strength increased. Furthermore, an increase in the PPy content in PPy/PP composites resulted in an increase in conductivity. SEM micrographs revealed that as the PPy loading increases from 10% to 20% in composite system, adhered PPy particles by PP matrix were driven out of PP matrix while PP matrix oriented along the draw direction during tensile test.

Subject Keywords

Polymers., Montmorillonite.

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http://etd.lib.metu.edu.tr/upload/2/12608574/index.pdf
https://hdl.handle.net/11511/16878

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Graduate School of Natural and Applied Sciences, Thesis

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Citation Formats

Ç. Börüban, “Synthesis and characterization of polypyrrole/montmorillonite and polypyrrole/polypropylene compdsites,” M.S. - Master of Science, Middle East Technical University, 2007.