Abstract
Phase transition temperatures of water-sodium cellulose sulphate systems with various water contents ranging from 0 to 2.0 (grams of water per gram of polymer) were evaluated by differential scanning calorimetry. When the system was quenched from the isotropic liquid state to ∼170 K, four kinds of phase transition were observed: a glass transition, cold crystallization, melting and a transition from the mesophase to the isotropic liquid state. When the system cooled gradually from the isotropic liquid state, or cooled from the mesophase, melting and a transition from the mesophase to the isotropic liquid were observed. The enthalpy of the transition indicated that each (OSO 3Na) 4 was surrounded by about three water molecules, which were strongly associated with the ionic groups, and behaved as non-freezing water, the transition of which could not be detected separately. A mesophase observed with water content ranging from 0.5 to 1.7, from 280 to 330 K, showed a time of reorganization of 50 to 300 s, which strongly suggests long-range order of the system.
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