Desorption kinetics of ethene, propene, and butadiene from films exhibiting axially oriented nanoporous-cryst. δ phases of syndiotactic polystyrene (s-PS) have been followed by gravimetric and IR linear dichroism measurements. The reported data can be rationalized by assuming that, after the initial desorption mainly involving mols. absorbed in the amorphous phase, most gaseous mols. are included as guest in the nanoporous-cryst. phase. This allows establishing a simple method to evaluate guest partition between nanoporous-cryst. and amorphous polymeric phases, which possibly can be applied for most volatile guest mols. The described method also allows establishing the presence of one guest mol. (ethene, propene, or butadiene) per cavity of the nanoporous δ form.
Infrared linear dichroism as a tool to evaluate volatile guest partition between amorphous and nanoporous-crystalline polymer phases
VENDITTO, Vincenzo;GUERRA, Gaetano
2012-01-01
Abstract
Desorption kinetics of ethene, propene, and butadiene from films exhibiting axially oriented nanoporous-cryst. δ phases of syndiotactic polystyrene (s-PS) have been followed by gravimetric and IR linear dichroism measurements. The reported data can be rationalized by assuming that, after the initial desorption mainly involving mols. absorbed in the amorphous phase, most gaseous mols. are included as guest in the nanoporous-cryst. phase. This allows establishing a simple method to evaluate guest partition between nanoporous-cryst. and amorphous polymeric phases, which possibly can be applied for most volatile guest mols. The described method also allows establishing the presence of one guest mol. (ethene, propene, or butadiene) per cavity of the nanoporous δ form.I documenti in IRIS sono protetti da copyright e tutti i diritti sono riservati, salvo diversa indicazione.