Dispersion of Silica Nanoparticles Bearing Perfluorohexyl Units into Fluorinated Copolymers
Résumé
This study aims at determining the compatibility
behavior of nanoparticles surface with fluorinated matrices to
obtain a homogenous dispersion and better composites properties.
First, modified silica nanoparticles by C6F13I and C6F13-
C2H4-SH led to various fluorinated silica of different massic
concentrations and grafting rates. The dispersion of these
nanoparticles (in 5 wt %) into molten poly(VDF-co-HFP) and
poly(TFE-co-HFP) matrices were studied as well as the hydrophobic,
mechanical, and thermal properties of both fluorinated
copolymers and resulting composites. In both series, the storage
modulus of nanocomposites increased while the melting
(Tm) and decomposition (T10%) temperatures varied with the
polymer matrix. They increased for poly(VDF-co-HFP) composites
(Tm5 134 to 144 C and T10%5 441 to 464 C) but
decreased for poly(TFE-co-HFP) nanocomposites (Tm5 276 to
268 C and T10%5 488 to 477 C).