Compatibilization Marangoni stress

Van Puyvelde Peter, Velankar S. Sachin, Moldenaers Paula, and Mewis Jan. Effect of Marangoni stresses on the deformation and coalescence in compatibilized immiscible polymer blends. Polym. Eng. Sci. 42 (2002) 1956-1964. 

Other effects can also be observed in compatibilized blends. Due to the flow of the matrix surrounding the dispersed droplets, the compatibilizer can be conveyed towards the tips of the droplets, which makes the behavior of the droplets more complex [119]. An inhomogeneous distribution of the compatibilizer leads to the concentration gradient at the interface which causes so-called Marangoni stress that tries to equalize the compatibilizer concentration on the droplet surface (Figure 3.15). It is supposed that the formation of the concentration gradient is easier in the systems vrith a p-value below unity [120]. As the Marangoni stress... 

Figure 3.15 Scheme of the effect of Marangoni stress induced by inhomogeneous distribution of the compatibilizer at the interface. 

Figure 3.16 Schematic representation of two possible mechanisms of the coalescence suppression in compatibilized polymer blends, (a) Due to Marangoni stress (b) Due to steric repulsion. Adapted from Ref [128] 2001, Elsevier.

---