Sulphonated poly(ether ether ketone) copolymers: Synthesis, characterisation and membrane properties

Novel sulphonated poly(ether ether ketone) (PEEK) copolymers with controlled degree of sulphonation were synthesized by polycondensation reaction of varying ratios of silylated phenolphthalein, silylated biphenol, 5,5′-carbonyl-bis(2-fluoro benzene sulphonate) (sulphonated 4,4′-difluorobenzophenone)...

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Bibliographic Details
Published in:Journal of membrane science 2005-09, Vol.261 (1), p.27-35
Main Authors: Muthu Lakshmi, R.T.S., Meier-Haack, Jochen, Schlenstedt, K., Vogel, C., Choudhary, V., Varma, I.K.
Format: Article
Language:English
Subjects:
Biphenol
Methanol permeability
Phenolphthalein
Proton conductivity
SPEEK
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Summary:Novel sulphonated poly(ether ether ketone) (PEEK) copolymers with controlled degree of sulphonation were synthesized by polycondensation reaction of varying ratios of silylated phenolphthalein, silylated biphenol, 5,5′-carbonyl-bis(2-fluoro benzene sulphonate) (sulphonated 4,4′-difluorobenzophenone) and 4,4′-difluorobenzophenone. The structure of the copolymers was confirmed by using ATR and 1H NMR techniques. Molecular mass of these samples was determined by GPC. Thermal stability of the samples was evaluated using TGA technique. Methanol diffusion coefficients were in the range of 6.57 × 10 −8 to 2.5 × 10 −6 cm 2/s. The proton conductivity of the membranes in the temperature range of 25–75 °C was found to be 10 −5 to 10 −3 S/cm.
ISSN:0376-7388
1873-3123
DOI:10.1016/j.memsci.2005.03.007