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Technology for preparation of perfluorinated copolymers for fuel cell membranes


 
   
The innovative technology for preparation of a proton conducting copolymer material for membranes is based on water-emulsion radical copolymerization of tetrafluoroethylene and perfluovinylalkyl ester.

Membrane polymer materials are used in POMFC fuel cells for a variety of power generators.

 
Basic diagram of the process for synthesis of ion-exchange membranes
1.jpg
 
Pre-
emulsification
of
sulfur-containing
perfluorinated
monomer
Copolymerization
of
tetrafluoroethylene
with the sulfur-
containing
perfluorinated
monomer in a
water emulsion
Isolation of the
copolymer from
latex
Washing and
drying of the
copolymer
Granulation and
extrusion of the
copolymer
Preparation of
the ion-
exchange
membrane
2.jpg
 
Advantages of the proposed technology
(against the synthesis in Freon solutions)
- High conversion of the sulfomonomer (80–90 %).
- Adjustable equivalent mass of the copolymer in the range of 900–1100.
- Two-fold cost reduction of the membrane copolymer due to a higher conversion (by a factor of 3) of the    sulfomonomer and water substitution for expensive Freons.
- Ecological compatibility, fire and explosion safety.
 
Specifications of the membrane material
Exchange capacity, mg-equ/gг 0.91–1.11
low index of the sulfofluoride melt
(P=21.2 H, T=270 °C), g/10 min
5–50
Proton conductivity at 20 °С, Cm/cm 0.08–0.10
Mechanical properties (sulfacid form, EM=1075):
extension strength limit, MPa 14.5–17.5
elastic constant, MPa 125–135
relative breaking extension, % 75–95
 
State-of-the-art
Facility for preparation of membrane copolymer is available.
 
Contacts
bic@catalysis.ru


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