Interphase entanglement density

The interphase is a separate phase with its own characteristics and two interfacial tension coefficients, Vj -f V2 = Vjj, with Vj2 being the experimental quantity. The lattice theories predict that in binary blends (1) there is a reciprocity between Vi2 and the interphase thickness, VjjA/ = constant (2) the surface energy is proportional to (3) polymer chain ends concentrate at the interface and (4) any low molecular weight component migrates to the interface. In consequence, the inter-phase is characterized by low entanglement density and viscosity, often evidenced by the interlayer slip [3]. 

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