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Synthesis, characterization, thermal degradation, and comparative chain dynamics studies of weak-link polysulfide polymers

Ramakrishnan, Latha and Sivaprakasam, Kannan (2009) Synthesis, characterization, thermal degradation, and comparative chain dynamics studies of weak-link polysulfide polymers. In: Journal of Polymer Research, 16 (6). pp. 623-635.

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Abstract

Synthesis, spectroscopic and thermal characterization of two new classes of polysulfide polymers: poly[1(phenoxymethyl) ethylene polysulfide] (PPMEP), and poly [1-(phenoxy) ethylene polysulfide] (PPEP) is presented. The direct pyrolysis mass spectrometry (DP-MS) technique, used to study the thermal degradation behavior of these polysulfide polymers, indicated that the polymers underwent degradation through the weak-links scission. The thermal stability of the polysulfide polymers decreased as the ``rank'' (number of sulfur atoms in the polysulfide linkage; n=1, 2, 4) increased. The main-chain flexibility of these polysulfide polymers in terms of their C-13 NMR spinlattice relaxation time (T-1) measurements on the backbone methine (-CH-) and methylene (-CH2-) carbons are reported here for the first time. A comparative study of the solution chain dynamics indicated that it increased as ``rank'' of the polysulfide linkages decreased as well as by introducing side chain spacers such as, ether (-O-) or methyleneoxy (-CH2O-) groups.

Item Type: Journal Article
Additional Information: Copyright for this article belongs to Springer.
Keywords: Chain dynamics; Direct pyrolysis-mass spectrometry; Polysulfidepolymers; Spin-lattice relaxation; Weak-link polymers
Department/Centre: Division of Chemical Sciences > Inorganic & Physical Chemistry
Date Deposited: 07 Jan 2010 05:44
Last Modified: 19 Sep 2010 05:52
URI: http://eprints.iisc.ernet.in/id/eprint/24813

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