Coarsening of the phase structure in immiscible polymer blends. Coalescence or ostwald ripening?

Effect of the elastomer viscosity on the morphology and impact behavior of injection molded foams based on blends of polypropylene and polyolefin elastomers

“…The higher thermal insulation caused that the temperature was higher in the foams core than in the corresponding solids. The dependence of coalescence and Ostwald ripening in quiescent melt polymer blends with temperature is well known 46– . 47 A slow cooling of the sample can imply a boosting of morphology degeneration due to these effects.…”

2D Encapsulation in Multiphase Polymers: Role of Viscoelastic, Geometrical and Interfacial Properties

“…The present results can also explained based on the theories of Ostwald ripening which predict a decrease in the droplet growth rate with increasing interfacial tension in contrast to the theories of coalescence. 40,44 In the literature, Ostwald ripening is a physical process in which molecules from a droplet diffuse into other phase (matrix in blend for example) due to the differences in capillary pressures between large and small droplet. Meanwhile, the calculation of the spreading parameters based on the surface tension measurements show that this parameter was higher for PDMS1 compared to PDMS2 and PDMS3 even its lower viscosity.…”

“…The Ostwald ripening predicts a decrease on the droplet growth rate with a higher interfacial tension: 44…”

Prediction of the Phase Structure Evolution during Processing of Polymer Blends. Results and Problems

“…So far, theories derived for dilute systems have been used for description of the breakup and coalescence in polymer blends. Their plausibility for typical polymer blends, where average distance between a droplet and its nearest neighbor is substantially smaller than average droplet radius, [15] should be checked. Further verification is also needed for the assumption that viscosity of the matrix should be substituted with viscosity of the blend in description of the droplet breakup.…”