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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 1 H- 13 C dipolar recoupling by rotor-encoded longitudinal magnetization (RELM) and 13 C spin-lattice relaxations. The proton conductivity increased linearly...
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