The Thermodynamics of Polymers Dissolution

Amorphous polymers heats of dissolution studies were performed often enough. It is supposed, that the heat effect of system transition from metastable (nonequilibrium) glassy state in quasiequilibrium solution give the dominant contribution in the heat of dissolution value. In addition, the 

The Fractal Physical Chemistry of Polymer Solutions and Melts 

The cluster model assumes availability in the amorphous polymers structure of local order domains (clusters), consisting of several densely packed collinear segments of different macromolecules (amorphous analog of crystallite with stretched chains). These clusters are connected between themselves by tie chains, forming by virtue of this physical entanglements network, and are surrounded by loosely packed matrix, in which all fluctuation free volume is concentrated [107], 

The authors [105] used amorphous glassy polymers PMMA, polycarbonate (PC) and polyarylate (PAr). The necessary for further evaluations shear modulus values G were obtained according to Young s modulus E experimental values with the formula using [88]  

Thirdly, the disolvation temperature enhancement leads to AH reduction and the cluster model supposes decrease at temperature growth. But the greatest interest the linear dependence of AH on temperatures difference (T-T ) is presented. Such dependence for different polymers 

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