Modification and characterization of bentonite with quaternary ammonium and phosphonium salts and its use in polypropylene nanocomposites

Date

2015-01-01

Author

Seyidoglu, Tijen
Yılmazer, Ülkü

Metadata

Show full item record

This work is licensed under a Creative Commons Attribution-NonCommercial-NoDerivatives 4.0 International License.

Item Usage Stats

1
views

0
downloads

Montmorillonite-rich local bentonite was modified with four different quaternary alkyl salts: hexadecyltrimethylammonium bromide ((HMA)(Br)), tetra(kis)decylammonium bromide ((TKA)(Br)), tetrabutylammonium tetrafluoroborate ((TBA)(BF4)), and tetrabutylphosphonium tetrafluoroborate ((TBP)(BF4)) to produce organoclays. The organoclays produced were characterized by Fourier transform infrared spectroscopy, thermogravimetric analysis (TGA), and x-ray diffraction (XRD). The XRD results indicate that the d-spacing of the organoclays increased as a consequence of the exchange of Na+ ions in the clay galleries with the cation of the surfactants with long alkyl tails. The d-spacing of the bentonite increased from 1.2nm to 1.78nm, 2.56nm, 1.48nm, and 1.64nm after modification with HMA, TKA, TBA, and TBP cations, respectively. TGA analysis of the organoclays showed that the decomposition temperatures of the organoclays were higher than the melt processing temperature of polypropylene (PP), permitting the use of these organoclays in melt processing of PP. Ternary composites of PP/PP-grafted maleic anhydride/organoclays were prepared using a twin screw extruder followed by injection molding for characterization. Transmission electron microscopy analysis of the composites showed intercalated structures as well as microcomposite formations. Mechanical properties of pure PP were improved through ternary composite formation.

Subject Keywords

Condensed Matter Physics, Ceramics and Composites

URI

https://hdl.handle.net/11511/57179

Collections

Graduate School of Natural and Applied Sciences, Article