ePrints@IIScePrints@IISc Home | About | Browse | Latest Additions | Advanced Search | Contact | Help

Spectral, thermal, and electrical properties of poly(o-and m-toluidine)-polystyrene blends prepared by emulsion pathway

Anand, Jayashree and Palaniappan, S and Sathyanarayana, DN (1998) Spectral, thermal, and electrical properties of poly(o-and m-toluidine)-polystyrene blends prepared by emulsion pathway. In: Journal of Polymer Science Part A: Polymer Chemistry, 36 . pp. 2291-2299.

[img]
Preview
PDF
page26au.pdf

Download (137Kb)

Abstract

Conducting poly(o-toluidine) (POT) and poly(m-toluidine) (PMT) blends containing 10, 30, 50, 70, and 90 % wt/wt of polystyrene (PSt) were prepared by employing a two-step emulsion pathway. The bands characteristic of both polystyrene and POT/PMT are present in the IR spectra of POT-PSt and PMT-PSt blends. The UV-visible spectra of POT-PSt and PMT-PSt blends exhibit two bands around 313 and 610 nm, confirming that some amount of POT/PMT base is present in the blends. The EPR parameters such as line width and spin concentration reveal the presence of POT/PMT salt in the respective blends. The TGA, DTA, and DSC results suggest a higher thermal stability for the POT and PMT blends than that for the respective salts. The conductivity values of POT(70)-PSt(30) and POT(90)-PSt(10) blends are almost the same ($ 1.1 * 10^{-2} and 1.3 * 10^{-2} S {cm}^{-1} $, respectively) and these values are very close to that of pure POT salt, suggesting that POT can be blended with up to 30% wt/wt of PSt to improve its mechanical properties without a significant drop in its conductivity. The conductivity values of PMT-PSt blends are lower than those of the corresponding POT-PSt blends by two to three orders of magnitude, indicating that POT is a better system than PMT to prepare blends by this method. The dielectric constant and tan d values of the blends increase with the amount POT/PMT and are greater than that of polystyrene.

Item Type: Journal Article
Additional Information: The copyright belongs to John Wiley & Sons, Inc.
Keywords: poly(o-toluidine) (POT);poly(m-toluidine) (PMT);polystyrene (PSt);blends;emulsion pathway;spectroscopy;thermal stability;conductivity.
Department/Centre: Division of Chemical Sciences > Inorganic & Physical Chemistry
Date Deposited: 05 Sep 2005
Last Modified: 19 Sep 2010 04:20
URI: http://eprints.iisc.ernet.in/id/eprint/3607

Actions (login required)

View Item View Item