The state of sorbed water on cellulose has been studied by pulsed NMR technique. From the experimental results of spin-lattice relaxation time ( T 1 ) and spin-spin relaxation time ( T 2 ), observed as a spin echo decay time, following conclusions have been derived. (1) Two phases of the sorbed water are classified; the localized and the mobile. (2) The correlation time (τ N ) derived from T 1 using BPP theory, is consistent with that (τ D ) derived from dielectric measurements. (3) T 1 is by one or two order longer than T 2 in contradiction to BPP theory for extremely narrowing case. As an explanation for this fact, we propose that, when we consider about T 2 , the effects of magnetic nuclei contained in the absorbent must be taken into account, though no theory is given. (4) The average life-time of water molecule sorbed on cellulose in the localized state is estimated to be several hundredths of a second and to decrease with temperature.
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Sasaki et al. (1960) studied this question.
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