Premium
Crystalline orientation and molecular transport properties in nanoporous syndiotactic polystyrene films
Author(s) -
Rizzo Paola,
Albunia Alexandra R.,
Milano Giuseppe,
Vendiito Vincenzo,
Guerra Gaetano,
Mensitieri Giuseppe,
Di Maio Luciano
Publication year - 2002
Publication title -
macromolecular symposia
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.257
H-Index - 76
eISSN - 1521-3900
pISSN - 1022-1360
DOI - 10.1002/1521-3900(200208)185:1<65::aid-masy65>3.0.co;2-9
Subject(s) - nanoporous , polystyrene , materials science , tacticity , phase (matter) , orientation (vector space) , thermal diffusivity , diffusion , molecular dynamics , chemical engineering , polymer , composite material , crystallography , polymer chemistry , nanotechnology , thermodynamics , chemistry , computational chemistry , organic chemistry , physics , geometry , mathematics , engineering , polymerization
The orientation of the crystalline δ nanoporous phase in syndiotactic polystyrene films, obtained by different procedures, have been characterized. For both solution cast and biaxially stretched films a high degree of uniplanar orientation, corresponding to the tendency of the ac crystallographic planes, to be parallel to the film plane has been observed and rationalized. According to molecular dynamics simulations of diffusion of small molecules into the δ nanoporous phase, this uniplanar orientation would minimize the molecular diffusivity through the nanoporous crystalline phase.