Studies on the thermal stability of F- and non-F-containing ladder polyepoxysilsesquioxanes by TGA-FTIR

Jinwei Wang, Chaobin He*, Yuhui Lin, Tai-Shung Chung

*Corresponding author for this work

Research output: Contribution to journalArticlepeer-review

17 Scopus citations

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 (RSiO 3/2 ) to silica (SiO 2 ), 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.

Original languageEnglish (US)
Pages (from-to)83-92
Number of pages10
JournalThermochimica Acta
Volume381
Issue number1
DOIs
StatePublished - Jan 3 2002

Keywords

  • Cleavage
  • Fluorinated
  • Ladder polyepoxysilsesquioxanes
  • Oxidation
  • TGA-FTIR

ASJC Scopus subject areas

  • Instrumentation
  • Condensed Matter Physics
  • Physical and Theoretical Chemistry

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