Rheology of Immiscible Blends with Organoclay

In PA-6/PO blends there is a natural tendency for day or organoday to migrate to the polar PA-6 phase or (especially in the presence of a paraffinic compatibilizer and/ or intercalant) to the interphase, forming a 100-200 nm thick, rigid membrane [376]. The presence of such an interphase reduces drop fibrillation and coalescence thus it increases the low frequency G plateau as well as the complex viscosity. 

Owing to the large aspect ratio of individual day platelets, the performance of nanocomposites is sensitive to the degree of dispersion and, thus, to the preparation method. For example, better performance has been reported for PP-based PNC prepared by the master batch (MB) method than by a single pass (SP) [378]. A similar 

During the last few years the preparation of PNC with polymer blends as the matrix has expanded for two reasons (i) improved dispersion of the minor polymer phase and (ii) improvement of the blend performance. Several publications include experimental data on the flow properties in dynamic shear. As already discussed, the only fundamental approach involved the use of Palieme model, and thus has been limited to low clay content [371, 372, 377]. Table 2.4 lists the publications that detail the dynamic shear behavior of these systems. 

In discussing the elongational flow behavior of polymer blends, the difference between single-phase (homopolymer or miscible blend) and multiphase (antagonistically immiscible PE/PS blend) was demonstrated in Eigures 2.12 and 2.13, 

PMMA/EVAc = 50/50 C-6A 0, 10 Smaller drops, interphase clay [380] 

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