Phase separation in IPN

It is important that the phase separation, in IPNs formed by the same components, depends on the condition of production. It was shown that the introduction, into IPN based on polyurethane, of monomeric or polymeric butyl methacrylate leads to a great difference in the viscoelastic properties, due to dif-... 

Therefore, all the IPNs are thermodynamically unstable. The pecuharity of IPN formation determines their morphology, which is formed in the course of phase separation by curing. Below we discuss two possible mechanisms of phase separation in IPNs. 

Generally, the following conclusion can be drawn from the analysis of the mechanisms of phase separation in IPNs. The structures arising at different... 

It has already been discussed that the phase separation in IPNs may be described in terms of the spinodal decomposition. At the initial stages the kinetics of phase separation is described by the linear theory of Cahn-Hilliard in spite of the fact that continuous changes of conversion occur in this case. This means that the system drifts along the phase diagram with a continuous change in parameter X23 and in the composition of the separating phases. Thus, one more principal feature of IPN structure formation is established. This feature consists in a continuous sequence of structures or states, which differ in composition not only at various stages of phase separation, but also... 

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