On the morphology and potential application of polydimethylsiloxane-silica-titania composites

Abstract

Abstract. Polydimethylsiloxane-!,"-diol was used as matrix for the preparation of polysiloxane-SiO 2 -TiO 2 composites through in situ incorporation of silica and titania using a solvent-free sol-gel procedure. For this purpose, oxide precursors tetraethyl-orthosilicate and tetrabutyl-orthotitanate, and a proper condensation catalyst, viz. dibuthyltin dilaurate, were added in pre-established amounts to the polymer. The hydrolysis and condensation reactions take place under mild conditions, with the formation of silicon and titanium oxide networks and polymer crosslinking. The effect of SiO 2 and TiO 2 mass ratio on the morphology of the composites was investigated by scanning electron microscopy (SEM) and X-rays diffraction (XRD), and interpreted in correlation with differential scanning calorimetry (DSC) and energy-dispersive X-ray spectroscopy (EDX) data. The film samples were tested as active elements in actuation devices.

Synergic Effect of TiO2 Filler on the Mechanical Properties of Polymer Nanocomposites

“…Compared with the isometric nanoparticles, a large surface-to-volume ratio of the 1D nanoparticle generally improves the nanocomposites properties. Contrary to the anatase polymer nanocomposites, only a few papers concerning polymers filled with titanate nanotubes have been found in the literature [ 130 , 131 , 132 ].…”

Dually crosslinkable SiO2@polysiloxane core–shell nanoparticles for flexible gate dielectric insulators

“…[36][37][38] Finally TEOS was introduced to compensate the decient reaction sites occupied by the phenyl groups of DEPS. 39 The composition of the monomer mixture was optimized to 15 mol%, 20 mol%, 35 mol%, 15 mol% and 15 mol% for GPTS, MPTS, TMMS, DEPS and TEOS respectively. The SiO 2 nanoparticle content was controlled to 20 wt% of the whole monomer mixture.…”

Particles that slide over the water surface: Synthesis and characterization of iron oxides particles coated with PDMS, with hydrophobic and magnetic properties

“…Thermal analysis of these particles also revealed that oil degradation of PDMS occur between 300 and 600 C and the amount of PDMS oil present in the samples was estimated in 9.7, 8.4, 7.5 and 5.7% for samples S2, S3, S4 and S5, respectively. Weight gain of the sample S4 is due to condensation of silanol groups present in the PDMS oil [35].…”