Polyelectrolyte multilayer films under mechanical stretch
Fiche publication
Date publication
janvier 2007
Auteurs
Membres identifiés du Cancéropôle Est :
Dr LAVALLE Philippe, Dr VOEGEL Jean-Claude, Pr SCHAAF Pierre, Dr MERTZ Damien
Tous les auteurs :
Mertz D, Hemmerle J, Boulmedais F, Voegel JC, Lavalle P, Schaaf P
Lien Pubmed
Résumé
Polyelectrolyte multilayers can be used to design films which respond to mechanical stimuli. The behaviors of three different polyelectrolyte multilayers deposited onto silicone sheets were investigated: PAH/PSS, PDADMA/PSS and PLL/HA films [PAH: poly(allylamine); PSS: poly(styrene sulfonate); PDADMA: poly(diallyldimethylammonium); PLL: poly(L- lysine); HA: hyaluronic acid]. While (PLL/HA) and (PDADMA/PSS) multilayers remain undamaged under stretch, (PAH/PSS) films are very brittle and cracks are formed for low elongation degrees. PAH/PSS films behave more like glasses whereas (PLL/HA) and (PDADMA/PSS) multilayers behave rather as gels. (PSS/PAH) and (PSS/PDADMA) multilayers were also deposited as a capping and impermeable layer on top of a (PLL/HA)(30) multilayer acting as a compartment. Whereas (PSS/PAH) barriers exhibit large micrometric cracks under stretch, (PSS/PDADMA) barriers open through nanopore formation for a given stretching degree. When these films are brought back to the non-stretched state, the nanopores close and the barrier becomes tight again. In the case of (PSS/PAH) barriers, only a partial tightening is achieved.
Référence
Soft Matter. 2007;3(11):1413-20