Nonparticulate Two-Phase System

In the nonparticulate two-phase system, two different materials are irregularly intermixed, and neither of them is considered the host matrix or the dispersed phase. 

In this chapter the dilute particulate system, the nonparticulate two-phase system, and the periodic system are discussed in Sections 5.2, 5.3, and 5.5, respectively. Section 5.4 deals with scattering from a fractal object, which may be regarded as a special kind of nonparticulate two-phase system. The soluble blend system is dealt with in Chapter 6. The method discussed in Section 4.2 for determining, for a single component amorphous polymer, the thermal density fluctuation from the intensity I(q) extrapolated to q -> 0 can also be regarded as a small-angle technique. 

By way of introduction we here summarize a few results of general validity, before focusing on the nonparticulate two-phase system that will be discussed in the rest of Section 5.3. For the present we stipulate only that the system of study is characterized by its scattering length density distribution p(r), which is not restricted in any way. The intensity of scattering I(q) is then given by... 

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