Interfacial Region in IPNs

The incomplete phase separation or phase separation due to the spinodal mechanism leads to the formation of a transition zone or an interphase between two evolved phases. The first attempt to estimate the volume fraction 

288-333 K indicates the presence of an interphase region. The same results were obtained for IPNs based on epoxy resin and allyl derivatives [95]. 

It is known that for two-component systems, additivity of lines takes place in NMR spectra. Assuming that the same additivity should be observed for the second moment, may be presented in the following way  

Using gas chromatography the excess enthalpy of mixing at the point of equilibrium adsorption may be found from Eq. 2. In this case the excess enthalpy of mixing of sorbate with f-th network and excess enthalpy of mixing of two networks were determined by  

The fraction of the material in the transition zone may be calculated, in analogy with determining the crystallinity from inverse gel-permeation chromatography (IGC) data, according to the equation  

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