Membrane and Desalination Technologies - TCE Moodle Website

58 J. Ren and R. Wang
N
O
O
3.10. Polyether Ether Ketones
N
O
O
Fig. 2.13 Chemical
structures of PEEK and
SPEEK.
O
O
N
O O
O
Matrimid 5218
N n
Polyether ether ketones (PEEK) are engineering thermoplastics with an exceptional
combination of heat and chemical stability. The high insolubility in common solvents
makes PEEK membranes successfully being used in chemical processes as a solvent resistant
membrane. But the PEEK membrane fabrication is limited by the conventional solvent based
methods for membrane casting. The sulfonated PEEK(SPEEK) is soluble in common solvents,
which can be used for the preparation of hydrophilic membranes or ion-exchange
membranes. The chemical structure of PEEK and SPEEK are shown in Fig. 2.13.
CH 3
O
80%
Copolyimide P84
H
C
H
H 3 C CH 3
CH 3
20%
Fig. 2.12 Chemical structures of copolyimide P84 and matrimid 5218.
PEEK
SPPEK