chapter  5
54 Pages

ENTHALPY CHANGES FOR AQUEOUS POLYMER SOLUTIONS

Comments: wB(1) and wB(2) denote the mass fractions of the polymer in the solution before and after the dilution process. Additional data were given by a figure in the original source.

T/K = 298.15 ∆solHB∞ = −150 J/(g polymer)

mA'/g 39.54 30.30 39.54 39.41 39.33 39.45 39.55 29.91 39.19 mB'/g 0.0 12.98 0.0 0.0 0.0 0.0 0.0 12.81 0.0 mA"/g 6.820 8.588 4.706 4.930 5.126 4.561 4.267 8.730 6.849 mB"/g 2.293 0.0 3.136 3.287 5.124 5.147 5.216 0.0 2.935 ∆dilh12/J −1.6 −1.8 −3.3 −4.0 −9.4 −10.4 −13.6 −1.7 −2.0

mA'/g 39.47 39.39 39.36 39.18 39.05 mB'/g 0.0 0.0 0.0 0.0 0.0 mA"/g 6.050 5.369 5.128 4.831 4.510 mB"/g 4.032 3.579 5.126 5.452 5.515 ∆dilh12/J −3.6 −5.1 −9.9 −10.5 −15.2

continued

mA'/g 38.82 39.03 38.50 38.81 mB'/g 0.0 0.0 0.0 0.0 mA"/g 5.271 4.884 5.874 4.648 mB"/g 3.568 4.884 3.976 4.647 ∆dilh12/J −4.8 −13.4 −5.4 −14.8

Comments: ∆dilh12 is the extensive enthalpy change in the result of the mixing process obtained for the given masses in the table, where the superscripts ' and " designate the two solutions placed in the two parts of a mixing cell, respectively.