TABLE OF CONTENTS Let us analyze the changing effect of the part of the plasticizer introduced into polymer on the glass transition temperature of the plasticized system. As mentioned above, there are two fundamental concepts for description of these dependences and two regularities corresponded to them: the Zhurkov rule of molar parts and the Kargin-Malinskii rule of volumetric parts.
According to the Zhurkov rule, decrease of the glass transition temperature is proportional to the molar part of the plasticizer introduced, i.e. when it is fulfilled, the dependence of the glass transition temperature on the molar part of the plasticizer must be linear. The experiments performed indicated [5] that dependence T g( ?) is not linear for all studied systems.
According to the Kargin-Malinskii rule, decrease of the glass transition temperature during plasticization is proportional to the volumetric part of the plasticizer in the polymer ( ), i.e. T g( ) must be linear. The experimental data for systems considered give no linear dependence.
Hence, both rules do not describe the real behavior of the given polymer-plasticizer systems.
Let us consider a possibility to describe the dependence of the glass transition temperature on the part of plasticizer, basing on the notions and calculation schemes, discussed above. According to the given ideas, the glass transition temperature of a linear polymer is described by correlation (IV.41).
If the plasticizer molecule interacts with polar groups of the polymer and screens...
