Tin-based “super-POSS” building blocks in epoxy nanocomposites with highly improved oxidation resistance

Adam Strachota , Krzysztof Rodzen , François Ribot (1) , Magdalena Perchacz , Miroslava Trchova , Milos Steinhart (2) , Larisa Starovoytova (3) , Miroslav Slouf , Beata Strachota

1 LCMCP (site Paris VI) - Laboratoire de Chimie de la Matière Condensée de Paris (site Paris VI)
2 IMC / CAS - Institute of Macromolecular Chemistry of the Czech Academy of Sciences
3 SRSMC - Structure et Réactivité des Systèmes Moléculaires Complexes

A novel tin-based POSS analogue, butylstannoxane dodecamer, was incorporated as chemically active nanofiller in epoxy resins and achieved a considerable anti-oxidative activity already near 0.05 wt% and very high activity near 1 wt%. The amino-functional nanofiller, which bonds as a linear segment, displayed a high reactivity towards the resin components during cure and was very poorly extractable. Interestingly, at elevated temperatures, the stannoxane nanofiller, whose functional substituents are attached by ionic bonds, displays a considerable short-range mobility in the matrix, and in course of a nano-phase-separation process, rearranges and polymerizes to needle-like nano-domains. This effect leads to additional crosslinking in the nanocomposite. This ``solid-phase nano-precipitation'' does not occur under oxidative conditions, where the nanofiller preferentially undergoes crosslinking with matrix chains and is thereby immobilized. Nanocomposite synthesis, characterization and the concentration dependence of the nanofiller effect are presented.

Mots clés: POSS; Nanocomposite; Stannoxane

Domaines: Matériaux

Adam Strachota, Krzysztof Rodzen, François Ribot, Magdalena Perchacz, Miroslava Trchova, et al.. Tin-based “super-POSS” building blocks in epoxy nanocomposites with highly improved oxidation resistance. Polymer, 2014, 55 (16, SI), pp.3498-3515. ⟨10.1016/j.polymer.2014.06.002⟩. ⟨hal-01289947⟩