Properties of PVDF-MCM41 Nanocomposites Studied by Dielectric, Raman and NMR Spectroscopy

Abstract

To obtain information on the polymer-inorganic filler interactions and on the confinement effect of polymer chains we studied the properties of solution-cast poly(vinylidene fluoride)-MCM41 molecular sieve nanocomposites. The dielectric response of the nanocomposites was found to be determined generally by the response of the polymer matrix, whereas the polymer-filler interactions resulted in an increase of the relaxation rates of the local mode and segmental motions in the amorphous phase of the poly(vinylidene fluoride) matrix. The effect has been related to a reduction of intermolecular correlations between the segments and was confirmed by the dispersion of 1 H spin-lattice relaxation times in PVDF-MCM41 composites. Moreover, the relaxometry experiments have shown that the dynamics of poly(vinylidene fluoride) chains confined to MCM41 molecular sieve channels can be described by tube/reptation model proposed by De Gennes, Doi and Edwards.

Mechanical, thermo‐mechanical, thermal, and swelling properties of EPDM‐organically modified mesoporous silica nanocomposites

“…The polymer nanocomposites prepared by MCM‐41 particles shows some unusual properties mainly due to the presence of the constrained organic phase within or outside the hexagonal pores of an inorganic material at the molecular level . There are three main synthetic approaches developed to produce polymer/silica nanocomposites, e.g., mixing of polymers with silica particles or silica precursors directly , mixing of the polymer monomers with silica particles followed by polymerization of the monomers , mixing of both polymer monomers and silica precursors followed by simultaneous polymerization of the precursors and monomers , Among these, probably most useful one is the incorporation of well dispersed inorganic silica nanoparticle into organic polymer . Generally, addition of rigid silica particles to a polymer matrix results in an increase in the strength, modulus, and thermal stability of the composite.…”

Poly(vinylidene fluoride) Intestinal Sleeve Implants for the Treatment of Obesity and Type 2 Diabetes

“…For the films prepared by the MDO method, a high percentage of the α phase was converted to the β phase during the stretching process, so the characteristic peaks of the β phase can be observed at 839, 1275 and 1431 cm −1 , but some weak characteristic peaks of the α phase can still be observed ( Figure 4 a). The wavenumber and vibration mode of the characteristic peaks of each phase are also listed for reference ( Table S1 ) [ 35 , 36 , 37 , 38 , 39 ].…”

Thin and surface adhesive ferroelectric poly(vinylidene fluoride) films with β phase‐inducing amino modified porous silica nanofillers

“…Moreover, an amine groups functionalized composite membrane (OMS‐NH 2 /PVDF) exhibits a high adsorption capacity for Cu(II) ions towards Cu(II) ions via efficient complexation with high stability for regeneration and reutilization. Mesoporous silica based nanohybrid of PVDF‐MCM exhibits increase of the dielectric relaxation rates of the local mode and segmental motions in the amorphous phase of the PVDF arising from reduction of intermolecular correlations between the segments confined into MCM‐41 molecular sieve channels …”