Calorimetric measurements of the heat of sorption of water vapor on dry swollen cellulose

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Abstract
Calorimetric measurements of the heat of sorption of water vapor on a dry swollen cellulose sample have been made for various swelling states of the sample. The state of swelling was characterized by the surface area of the sample as determined by nitrogen adsorption (B.E.T.) Six runs were made with the surface area varying from 140 m.2/g. to 2 m.2/g. The initial heats do not vary significantly with change in surface area and were found to be 15 to 16 kcal. per mole of water sorbed. The energetics of water sorption and the water regain, at low water concentrations, are entirely independent of the surface area range (swelling state) of the cellulose. The surface area was found to decrease logarithmically with the quantity of water sorbed on the cellulose. It is concluded that the interaction of water and cellulose is a bulk rather than a surface effect.
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