Volumetric swelling coefficients

Tables I, II, and III give volumetric swelling coefficients for southern pine sapwood for various potential reagents, catalysts, and solvents (JO). These coefficients were determined under two sets of conditions. Specimens from oven-dried southern pine sapwood blocks were measured and their volumes were determined. Ten specimens from this set were submerged in a solution and either treated at 120 °C and a pressure of 150 Ib/in. for 1 h, or they were soaked at 25 for 48 h.

Table II. Volumetric Swelling Coefficients (S) for Southern Pine Sapwood in Various Catalysts...

Volumetric swelling coefficient determined from initial oven-dry volume and first water-swollen volume. Antishrink efficiency based on Sj. 

Information on the degree of swellability of the polymers can be determined either from the measured density of the dry resin and the weight of imbibed solvent using the centrifugation technique [52-55, 299] or from the proportion of the specific gel bed volume to the bulk volume [57]. The volumetric swelling coefficient B can be calculated using Duesek s equation (Eq. 1.17) [58]. 

Table 4.4 Swelling coefficient P %) (per 1 % moisture weight gain) Py, P, and are volumetric, longitudinal, and transverse coefficients, respectively...

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