http://www.cnr.it/ontology/cnr/individuo/prodotto/ID142815
Amorphous glassy perfluoropolymer membranes of Hyflon AD®: free volume distribution by photochromic probing and vapour transport properties (Contributo in volume (capitolo o saggio))
- Type
- Label
- Amorphous glassy perfluoropolymer membranes of Hyflon AD®: free volume distribution by photochromic probing and vapour transport properties (Contributo in volume (capitolo o saggio)) (literal)
- Anno
- 2010-01-01T00:00:00+01:00 (literal)
- Http://www.cnr.it/ontology/cnr/pubblicazioni.owl#doi
- 10.1021/ma901244d (literal)
- Alternative label
J.C. Jansen, K. Friess, E. Tocci, M. Macchione, L. De Lorenzo, M. Heuchel, Y.P. Yampolskii, E. Drioli (2010)
Amorphous glassy perfluoropolymer membranes of Hyflon AD®: free volume distribution by photochromic probing and vapour transport properties
ACS, American chemical society, Washington, DC (Stati Uniti d'America) in , 2010
(literal)
- Http://www.cnr.it/ontology/cnr/pubblicazioni.owl#autori
- J.C. Jansen, K. Friess, E. Tocci, M. Macchione, L. De Lorenzo, M. Heuchel, Y.P. Yampolskii, E. Drioli (literal)
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- Institute on Membrane Technology, ITM-CNR, c/o University of Calabria, Via P. Bucci 17/C, I-87030 Rende (CS), Italy
Institute of Chemical Technology Prague, Department of Physical Chemistry, Technicka 5, Prague 6-Dejvice, 166 28 Czech Republic
GKSS Research Center, Institute of Chemistry, Kantsrasse 55, D-14513, Teltow, Germany
Russian Academy of Science (RAS), A.V. Topchiev Institute of Petrochemical Synthesis (TIPS), Moscow, Russia (literal)
- Titolo
- Amorphous glassy perfluoropolymer membranes of Hyflon AD®: free volume distribution by photochromic probing and vapour transport properties (literal)
- Http://www.cnr.it/ontology/cnr/pubblicazioni.owl#inCollana
- Membrane gas separation (literal)
- Abstract
- A comparative study of five different experimental and computational methods is presented
for the characterization of the overall free volume (FV) and the free volume element (FVE) size and shape
distribution in amorphous glassy perfluoropolymers (PFPs). Experimental results from the photochromic
probe (PCP) method, positron annihilation lifetime spectroscopy (PALS), and inverse gas chromatography
(IGC) were confronted with literature data from 129Xe NMR spectroscopy, and the experimental data were
further compared with molecular dynamics (MD) simulations and a combination ofMDstudies and the wellknown
Bondi method as well as a modified Bondi method. An evaluation of the advantages and the limits of
each method is presented. This is the first reported study on a so vast number of complementary techniques
applied on a single glassy polymer, in this case Hyflon AD perfluoropolymer, and is also the first successful
application of the photochromic probe technique in such materials. In two different grades of Hyflon AD, the
polymer with the highest content of the stiff cyclic comonomer was found to have a slightly larger average
FVE size but a lower void concentration, explaining the nearly identical density and fractional free volume
(FFV) of the two samples. PALS furthermore demonstrated a similar trend for solution-cast samples in
comparison with melt-pressed samples, the latter having FVEs with a smaller size but a higher concentration.
The data from IGC seem to correspond most closely to those of the PCP method. Differences between the
results from the individual techniques derive mainly from the fundamentally diverse nature of the various
probing methods but also from the different capacity to take into account the FVE shape. Only MD
simulation studies, using detailed atomistic packing models, can give such deep insight into the spatial
arrangement of the FVEs directly. Besides giving the highest level of detail,MDsimulations can thus help to
understand the possible limits of the experimental methods. Knowledge of their free volume distribution is of
fundamental importance to gain more insight into the mass transport phenomena in these materials, relevant
for their successful application in the emerging field of synthetic membranes for gas and vapor separations. (literal)
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