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Oxidative Metamorphosis of Poly(Styrenedisulfide) Backbone

Latha, R and Ganesh, K and Kishore, K (2000) Oxidative Metamorphosis of Poly(Styrenedisulfide) Backbone. In: Macromolecules, 33 (9). pp. 3224-3231.

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This is the first report on the oxidation of a disulfide polymer, viz., poly(styrenedisulfide) (PSD). Oxidation was performed using $KMnO_4$ and $KHSO_4$, which are strong and mild oxidizing agents, respectively. Fourier transform-infrared spectroscopy (FT-IR) and intrinsic viscosity ([\eta]) measurements revealed that degradation of PSD occurs to some extent during oxidation when $KMnO_4$ was used. Further, FT-IR and [\eta] results indicated that the oxidation of PSD using $KMnO_4$ is better in heterogeneous conditions than under phase-transfer medium because the degradation was curtailed in the former case. Direct pyrolysis-mass spectrometry (DP-MS), Fast atom bombardment mass spectrometry (FABMS) and pyrolysis-gas chromatography-mass spectrometry (Py-GC-MS) analyses of the oxidized PSD was carried out and the obtained results corroborate well with the FT-IR and [\eta] studies. Increased rigidity of the oxidized polymers which is reflected in their $T_g$ and [\eta] values, compared to PSD, was further confirmed by the radius of gyration $(R_g)$ and trans percentage data calculated from the molecular dynamics simulations studies.

Item Type: Journal Article
Publication: Macromolecules
Publisher: American Chemical Society
Additional Information: Copyright of this article belongs to American Chemical Society.
Department/Centre: Division of Chemical Sciences > Inorganic & Physical Chemistry
Date Deposited: 30 Jul 2008
Last Modified: 19 Sep 2010 04:48
URI: http://eprints.iisc.ac.in/id/eprint/15369

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