A platform for research: civil engineering, architecture and urbanism
A platform for research: civil engineering, architecture and urbanism
Synthesis, characterization and reinforcing properties of novel, reactive clay/poly(glycidyl methacrylate) nanocomposites
Abstract Clay/polymer nanocomposites, of the type montmorillonite/poly(glycidyl methacrylate) [MMT/PGMA], were synthesized via atom transfer radical polymerization (ATRP). An ATRP initiator, consisting of quaternary ammonium salt bearing a 2-bromo-2-methyl propionate moiety was intercalated into the interlayer spacings of the layered silicate. The ammonium salt-modified montmorillonite (MMT–Br) served as macroinitiator for the in situ ATRP of glycidyl methacrylate resulting in highly exfoliated MMT/PGMA nanocomposites, as judged by XRD measurements. However, TEM shows the existence of intercalated clay regions, but at a very low extent. TGA and XPS analyses indicate that the nanocomposites have PGMA-rich bulk and surface. Indeed, the mass loading of PGMA reached 61wt.% whilst XPS spectra, particularly the high resolution C1s region, resemble those of pure PGMA. The MMT/PGMA nanocomposites were found to be soluble in chloroform with a transparent solution, fully compatible with epoxy resin without any sign of phase separation. The primary MMT/PGMA nanocomposites were mixed with DGEBA and DETA in chloroform in order to prepare moulded, ternary MMT/PGMA–epoxy–DETA nanocomposites by solvent evaporation. The dried ternary systems exhibited superior viscoelastic properties (storage modulus and tan δ) compared to the neat crosslinked epoxy–DETA adhesive prepared in the absence of any clay nanocomposite.
Synthesis, characterization and reinforcing properties of novel, reactive clay/poly(glycidyl methacrylate) nanocomposites
Abstract Clay/polymer nanocomposites, of the type montmorillonite/poly(glycidyl methacrylate) [MMT/PGMA], were synthesized via atom transfer radical polymerization (ATRP). An ATRP initiator, consisting of quaternary ammonium salt bearing a 2-bromo-2-methyl propionate moiety was intercalated into the interlayer spacings of the layered silicate. The ammonium salt-modified montmorillonite (MMT–Br) served as macroinitiator for the in situ ATRP of glycidyl methacrylate resulting in highly exfoliated MMT/PGMA nanocomposites, as judged by XRD measurements. However, TEM shows the existence of intercalated clay regions, but at a very low extent. TGA and XPS analyses indicate that the nanocomposites have PGMA-rich bulk and surface. Indeed, the mass loading of PGMA reached 61wt.% whilst XPS spectra, particularly the high resolution C1s region, resemble those of pure PGMA. The MMT/PGMA nanocomposites were found to be soluble in chloroform with a transparent solution, fully compatible with epoxy resin without any sign of phase separation. The primary MMT/PGMA nanocomposites were mixed with DGEBA and DETA in chloroform in order to prepare moulded, ternary MMT/PGMA–epoxy–DETA nanocomposites by solvent evaporation. The dried ternary systems exhibited superior viscoelastic properties (storage modulus and tan δ) compared to the neat crosslinked epoxy–DETA adhesive prepared in the absence of any clay nanocomposite.
Synthesis, characterization and reinforcing properties of novel, reactive clay/poly(glycidyl methacrylate) nanocomposites
Djouani, Fatma (author) / Herbst, Frederic (author) / Chehimi, Mohamed M. (author) / Benzarti, Karim (author)
Construction and Building Materials ; 25 ; 424-431
2010-01-05
8 pages
Article (Journal)
Electronic Resource
English
Clay , Polymer , Nanocomposite , Epoxy , Exfoliation , Nanofiller , Dispersion , Viscoelastic properties
| British Library Online Contents | 2011
| British Library Online Contents | 2007
Preparation of clay–poly(glycidyl methacrylate) composite support for immobilization of cellulase
| Online Contents | 2013