Chemisorption and thermally induced transformations of polydimethylsiloxane on the surface of nanoscale silica and ceria/silica

Kostiantyn Kulyk, Mykola Borysenko, T.V. Kulik, Lyuba Mikhalovska, John D. Alexander, Borys Palianytsia

Research output: Contribution to journalArticle

Abstract

Compositions of polydimethylsiloxane (PDMS) polymer with nanosized silica and ceria/silica wereprepared. The influence of these nano-fillers on the thermal stability and degradation mechanism of silicone polymer was investigated using Thermogravimetric Analysis (TGA) and Temperature Pro- grammed Desorption Mass Spectrometry (TPD MS). The results showed that thermal decomposition of pure and adsorbed PDMS differs significantly. The three main stages of the PDMS thermal trans- formations in the adsorbed state were determined to be: 1) chemisorption of PDMS chains involving the terminal trimethylsilyl groups of the polymer and silanol groups of the silica surface; 2) formation and desorption of cyclic oligomers; 3) high temperature radical degradation of the polymer accompanied by the formation of methane and ethylene. The kinetic parameters of the corresponding reactions were calculated from the TPD MS data. It was found that nanoparticles of cerium dioxide strongly influence the degradation pattern, lower the decomposition temperature and catalyze the formation of methane.
Original languageEnglish
Pages (from-to)203-211
Number of pages9
JournalPolymer Degradation and Stability
Volume120
DOIs
Publication statusPublished - 31 Oct 2015

Keywords

  • Polydimethylsiloxane
  • Nanocomposite
  • Silica
  • Ceria
  • Pyrolysis
  • TPD MS

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