Article Dans Une Revue Polymer Degradation and Stability Année : 2025

Relationship between structure and thermal stability of fluorosilicones at high temperatures

Résumé

The thermal stability of fluorosilicones at high temperatures has been investigated with thermogravimetric analysis (TGA) based on their chemical structure (copolymerization and crosslinking), and compounding (incorporation of silica and titanium dioxide particle fillers). This allowed the comparison of thermal degradation kinetics of model samples and commercial fluorosilicones rubbers. Increasing dimethylsiloxane content in copolymers enhances thermal stability, while the presence of vinyl groups accelerates degradation by promoting depolymerization and crosslinking reactions at an earlier stage. In model filled fluorosilicone rubbers (FSR), untreated silica particles were found to destabilize the polymer matrix in the short term, whereas commercial filled FSRs exhibited greater thermal stability due to treated silica surfaces. Additionally, commercial samples crosslinked with DCP mixed with CaCO 3 resulted in the highest thermal stability. FTIR transmission analysis of copolymer residues revealed that degradation does not favor the preferential release of any monomer (dimethylsiloxane or trifluoropropylmethylsiloxane). Elemental analysis of a model homopolymer suggested that depolymerization is the dominant degradation mechanism, but side group scissions also contribute to this process.

Domaines

Fichier principal
Vignette du fichier
structure stability fluorosilicones.pdf (2.25 Mo) Télécharger le fichier
Origine Publication financée par une institution
Licence

Dates et versions

hal-05032827 , version 1 (14-04-2025)

Licence

Identifiants

Citer

Leticia Pires, Alice Corfa, Vincent Ladmiral, Sylvain Caillol, Sébastien Roland, et al.. Relationship between structure and thermal stability of fluorosilicones at high temperatures. Polymer Degradation and Stability, 2025, 238, pp.111340. ⟨10.1016/j.polymdegradstab.2025.111340⟩. ⟨hal-05032827⟩
86 Consultations
199 Téléchargements

Altmetric

Partager

  • More