In-situ fabrication of polyacrylate-silver nanocomposite through photoinduced tandem reactions involving eosin dye

Lavinia Balan (1) , Jean-Pierre Malval (1) , Raphaël Schneider (2) , Didier Le Nouen (3) , Daniel Joseph Lougnot (1)

1 IS2M - Institut de Science des Matériaux de Mulhouse
2 LRGP - Laboratoire Réactions et Génie des Procédés
3 COB - Laboratoire de Chimie organique et bioorganique

A silver-acrylate nanocomposite was prepared using a novel one-pot strategy involving eosin dye as visible sensitizer and an amine derivative as radicals' source. The mechanism highlighted by steady state photolysis and time-resolved absorption spectroscopy lies on the initial formation of a strong ion-pair complex between eosin and Agþ. Upon visible irradiation, the excited triplet state of the metal complex efficiently abstracts a hydrogen atom from the amine and produces an a-aminoalkyl radical. In acrylate monomer matrix, such a strong reactive species initiates a free radical photopolymerization and also provides the reduction of the silver cation. Through this 'in-situ' fabrication method, the kinetics formation of the nanocomposite and its detailed structural analysis are characterized by UV-visible, realtime FTIR absorption spectroscopy and by transmission electron microscopy.

Domaines: Matériaux

Lavinia Balan, Jean-Pierre Malval, Raphaël Schneider, Didier Le Nouen, Daniel Joseph Lougnot. In-situ fabrication of polyacrylate-silver nanocomposite through photoinduced tandem reactions involving eosin dye. Polymer, 2010, 51 (6), pp.1363-1369. ⟨10.1016/j.polymer.2009.05.003⟩. ⟨hal-00785986⟩