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Title: Studies on the thermal stability of F- and non-F-containing ladder polyepoxysilsesquioxanes by TGA-FTIR
Authors: Wang, J.
He, C.
Lin, Y.
Chung, T.S. 
Keywords: Cleavage
Ladder polyepoxysilsesquioxanes
Issue Date: 3-Jan-2002
Citation: Wang, J., He, C., Lin, Y., Chung, T.S. (2002-01-03). Studies on the thermal stability of F- and non-F-containing ladder polyepoxysilsesquioxanes by TGA-FTIR. Thermochimica Acta 381 (1) : 83-92. ScholarBank@NUS Repository.
Abstract: The thermal stability of non-F- (LPS-I) and F- (LPS-II) containing ladder polyepoxysilsesquioxanes under air and nitrogen was studied by DSC, TGA and TGA-FTIR techniques. The thermally curing temperature for LPS-II is about 20°C higher than that for LPS-I. Both LPS-I and LPS-II exhibits higher thermal stability under air and nitrogen as observed from TGA, where the decomposition temperatures at 5 and 10% weight loss were above 425 and 480°C, respectively. Under nitrogen, the higher decomposition temperature and residue from TGA was attributed to the gradual cleavage of C-Si and C-C bonds and high stability of F-containing side-chains (non-broken). Because of the weight gain from the oxidation of silsesquioxanes (RSiO3/2) to silica (SiO2), and gradual cleavage of F-containing side-chains, LPS-II exhibits higher decomposition temperature under air environment than under nitrogen. These phenomena detected from TGA could be observed directly from TGA-FTIR stack plots. As combined techniques for the evolved gas analysis, TGA-FTIR played an important role in explaining the phenomena of degradation related to the change of polymer chain structures during heating. © 2002 Elsevier Science B.V. All rights reserved.
Source Title: Thermochimica Acta
ISSN: 00406031
DOI: 10.1016/S0040-6031(01)00644-X
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