Deformation of a Swollen Network

With the introduction of these relations into Eq. (41), the configurational entropy change (the entropy of mixing solvent and polymer excluded see Chap. XII) relative to the initial state ax = ay = az = l becomes 

Comparison of Eq. (B-5) with (44) shows, since 1, that a greater 

For a more extensive discussion of the physical properties of rubber, the reader is referred to The Physics of Rubber Elasticity by L. R. G. Treloar (Oxford, Clarendon Press, 1949), 

Ideal solution behavior over extended ranges in both composition and temperature requires that the following conditions be fulfilled (i) the entropy of mixing must be given by  

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