J. Carretero-González, J. L. Valentín, M. Arroyo, K. Saalwächter, M.A. Lopez-Manchado.
Natural rubber/clay nanocomposites: Influence of poly(ethylene glycol) on the silicate dispersion and
local chain order of rubber network.
Eur. Polym. J. 44, 3493–3500 (2008). DOI
A novel preparation of natural rubber (NR)/Na+–montmorillonite (MMT) nanocomposites in only one step by
using poly(ethylene glycol) (PEG) has been investigated. PEG behaves as
dispersing agent favouring the intercalation of rubber chains into the silicate
galleries and providing substantially improved clay dispersion.
Intercalated/exfoliated miscible hybrids were observed by X-ray diffraction
(XRD) and transmission electron microscopy (TEM). The influence of PEG on the
network structure has also been evaluated by static proton double-quantum
nuclear magnetic resonance spectroscopy (1H DQ
NMR) at low-field. Silicate nanoparticles with a high aspect ratio (clay
tactoids) and a more crosslinked rubber network have been obtained for an
optimum PEG/MMT ratio. Both effects were responsible of the enhancement on