THERMODYNAMICS OF CONFORMATION AND DEFORMATION OF LINEAR POLYMERIC CHAINS
Author(s): Yu.G.Medvedevskikh (The Department of the L.V. Pisarzhevsky Institute of Physical Chemistry of the National Academy of Sciences of Ukraine, 3a Naukova Str., 79053 Lviv, Ukraine)
Thermodynamics of conformation and deformation of linear polymeric chains in a solution is built based on the statistics of self-avoiding walks. The entropy and free energy of conformation of a polymeric chain is presented as a sum of two terms. The first one takes into account the contribution of random walk and the second one takes into account the contribution of two limitations, which covered random walk and create the effect of self-organization of a polymeric chain. Deformation of the polymeric chain is considered as an equilibrious transition of Flory ball into conformational ellipsoid. The expressions for thermodynamic and elastic properties of the polymeric chain as functions of the degree of its deformation are suggested. Volumetric module, Young's module and module of polymeric chain shift are expressed through the pressure of conformation; Poisson's ratio depends only upon the dimension of Euclidean space. Forces and work of deformation are determined; the method of calculating the main tensions is suggested.
Key words: conformation, thermodynamics, polymeric chains, deformation
modules of elasticity, forces, work
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