Nanocomposite gels constituted of nanoclays and polymers are solutions which have many interestsas material in fields such as painting� In order to optimize these mechanical properties, the control of nanoclay dispersion and polymer structure seems important.Among nanoclay hydrogels, we chose to use laponite, synthetic monodisperse nanoclay which is known to form a gel phase at low concentration and whose understanding is still a theoreticalchallenge.Several studies have been carried out on laponite/PEO systems. In water PEO has a gaussian chain conformation. The addition of PEO in PEO/laponite hydrogel has been observed by rheology and SANS and it seems that the polymer chains �break� its structure.We performed polymer/nonoclays based hydrogel which shows really interesting properties. Weadd to laponite solution another hydrophilic polymer synthesized in our lab by G. Volet and L.Marx which conformation is really different from the one of PEO, Polyoxazoline (POXAZ). NMRmeasurements have shown that this polymer adsorbs more intensively on laponite that PEO. This different conformation and adsorption on laponite of the added polymer would change structural such as rheological properties of the hydrogels.Whereas the increase in concentration of a polymer such has PEO seems to �break� laponite gels, the increase of concentration of POXAZ seems to display a different behavior. At fixed laponite concentration and at low POXAZ concentration (below 0.63%), the addition of polymer decreases G' modulus and seems to break laponite hydrogel like PEO. Over this value, it seems to increase G'   . In this study, we correlate rheological changes to structural changes and compare it to PEO/laponite hydrogel

Nancocomposite hydrogels with tunable rheological properties: Polyoxazoline/laponite hydrogels

248th National Meeting (2014)

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