Influence of water and degree of sulfonation on the structure and dynamics of SPEEK studied by solid-state 13C and 1H NMR
- Influence of water and degree of sulfonation on the structure and dynamics of SPEEK studied by solid-state 13C and 1H NMR
- 백윤기; 채신애; 한옥희; 황상엽; 하흥용
- SPEEK; Solid State NMR; molecular motion; water channel; proton cunductivity
- Issue Date
- VOL 50, NO 12, 2664-2673
- The molecular motions of sulfonated poly(ether-ether ketone) (SPEEK), synthesized by conventional
method with a range of degree of sulfonation (DS) between 42 and 70%, as a function of DS and hydration
were studied by 1H-13C dipolar recoupling by rotor-encoded longitudinal magnetization (RELM) and 13C
spin-lattice relaxations. The proton conductivity increased linearly with increasing DS from 52% and was
comparable to that of Nafion 115 measured in the same condition for DS higher than 65%. The RELM
dipolar patterns analyzed by the SIMPSON simulation program indicated that the population of phenyl
rings in large amplitude motions such as 180˚-flips was reduced with increasing DS. On the other hand,
T1ρ (13C) and T1 (13C) results suggested that the dynamic chains in both 66 kHz and 100 MHz regimes
were more populated with increasing DS, possibly in small-amplitude oscillations.
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