2024-03-28T10:43:07Zhttp://digital.csic.es/dspace-oai/requestoai:digital.csic.es:10261/607722016-02-17T11:33:15Zcom_10261_56com_10261_3col_10261_309
00925njm 22002777a 4500
dc
Vargas, Joel
author
Santiago, Arlette A.
author
Tlenkopatchev, Mikhail A.
author
López-González, Mar
author
Riande, Evaristo
author
2010
This work reports a comparative study of gas transport in membranes based on polynorbornenes
and polyoxanorbornenes containing fluorinated dicarboximide side moieties,
specifically, poly(N-pentafluorophenyl-exo-endo-norbornene-5,6-dicarboximide), poly(exo-Npentafluorophenyl-
7-oxanorbornene-5,6-dicarboximide), poly(N-3,5-bis(trifluoromethyl)phenylexo-
endo-norbornene-5,6-dicarboximide) and a random copolymer of N-pentafluorophenyl-exo-endonorbornene-
5,6-dicarboximide-co-N-phenyl-exo-endo-norbornene-5,6-dicarboximide with 50/50M
composition. The gases studied were hydrogen, oxygen, nitrogen, carbon dioxide, methane, ethane,
ethylene and propylene. The presence of fluorine atoms in the membranes increases their permeability
in slight detriment of the permselectivity, the increase being higher for F–C bonds with carbon
hybridization sp3 than sp2. The substitution of the CH2 groups of the norbornene moieties decreases
the permeability as a consequence of the decrease of the solubility. A thorough study is carried out on
the variation of the permeability coefficient and concentration of condensable gases, such as carbon
dioxide and propylene, in the poly(N-pentafluorophenyl-exo-endo-norbornene-5,6-dicarboximide) and
poly(N-3,5-bis(trifluoromethyl)phenyl-exo-endo-norbornene-5,6-dicarboximide) membranes finding
that the values of the effective diffusion coefficient are similar to those obtained by the dual-mode
model but significantly higher than those estimated by the time-lag from permeation results. The results
also show that conditioning the membranes with condensable gases under high pressure increases the
diffusivity.
Journal of Membrane Science 361 : 78–88 (2010)
0376-7388
http://hdl.handle.net/10261/60772
10.1016/j.memsci.2010.06.007
http://dx.doi.org/10.13039/501100003141
http://dx.doi.org/10.13039/501100005739
http://dx.doi.org/10.13039/501100008737
Permeation
Sorption
Diffusion
Ring opening metathesis polymerization
Fluorinated polynorbornene dicarboximide
Gas transport in membranes based on polynorbornenes with fluorinated dicarboximide side moieties