Exfoliated tungstenite (EWS2) is a graphene-like 2D nanomaterial with exceptional physical properties. In this work, the production of EWS2 at high concentration and its use for the obtainment of acrylic nanocomposites was investigated. For the first time, ultrasonication was exploited for obtaining tungstenite nanoparticles directly into an acrylic monomer (tetraethyleneglycol diacrylate) without any chemical manipulation and avoiding the recovery of the sonicated nanoparticles, hence preventing any possible restacking phenomenon. The resulting liquid dispersions were characterized by Raman, transmission electron and scanning electron microscopies, which confirmed the obtainment of exfoliated material. It was also found that EWS2 concentration depends on sonication time and WS2 concentration. Eventually, the dispersions were directly used for preparing nanocomposites containing a relatively large amount of exfoliated tungstenite. Differential scanning calorimetry and thermogravimetric analyses were performed in order to assess the effect of the presence of the exfoliated nanofiller on the thermal features of the polymer matrix: a clear improvement of the thermal and thermo-oxidative stability was observed. At variance, the effect of the exfoliated tungstenite on the glass transition temperature of the polymer matrix was negligible. Furthermore, the mechanical behavior of the obtained nanocomposites was evaluated by means of flexural and shore A hardness tests: the exfoliated nanofiller turned out to exert a strong reinforcing effect on the polymer matrix even at very low concentration.

Preparation and Characterization of Polymeric Nanocomposites Containing Exfoliated Tungstenite at High Concentrations / Nuvoli, Daniele; Alzari, Valeria; Sanna, Roberta; Malucelli, Giulio; Mariani, Alberto. - ELETTRONICO. - (2014), pp. 118-118. (Intervento presentato al convegno International Conference on Structural Nano Composites tenutosi a Madrid nel 20-21 May 2014).

Preparation and Characterization of Polymeric Nanocomposites Containing Exfoliated Tungstenite at High Concentrations

Giulio Malucelli;
2014

Abstract

Exfoliated tungstenite (EWS2) is a graphene-like 2D nanomaterial with exceptional physical properties. In this work, the production of EWS2 at high concentration and its use for the obtainment of acrylic nanocomposites was investigated. For the first time, ultrasonication was exploited for obtaining tungstenite nanoparticles directly into an acrylic monomer (tetraethyleneglycol diacrylate) without any chemical manipulation and avoiding the recovery of the sonicated nanoparticles, hence preventing any possible restacking phenomenon. The resulting liquid dispersions were characterized by Raman, transmission electron and scanning electron microscopies, which confirmed the obtainment of exfoliated material. It was also found that EWS2 concentration depends on sonication time and WS2 concentration. Eventually, the dispersions were directly used for preparing nanocomposites containing a relatively large amount of exfoliated tungstenite. Differential scanning calorimetry and thermogravimetric analyses were performed in order to assess the effect of the presence of the exfoliated nanofiller on the thermal features of the polymer matrix: a clear improvement of the thermal and thermo-oxidative stability was observed. At variance, the effect of the exfoliated tungstenite on the glass transition temperature of the polymer matrix was negligible. Furthermore, the mechanical behavior of the obtained nanocomposites was evaluated by means of flexural and shore A hardness tests: the exfoliated nanofiller turned out to exert a strong reinforcing effect on the polymer matrix even at very low concentration.
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Utilizza questo identificativo per citare o creare un link a questo documento: https://hdl.handle.net/11583/2711666
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