流场中高分子共混物分散相的形态变化

VARIATION OF THE DISPERSED PHASE MORPHOLOGY OF POLYMER BLENDS IN FLOW FIELD

评述了高分子共混物分散相微粒在流场中形变、破裂和凝聚的研究进展。

In this paper, the deformation, breakup, and coalescence of dispersed phase droplets in Newtonian liquid systerms and viscoelastic liquid systems were reviewed with 34 references. The dispersion process are affected by viscosity ratio, elasticity ratio, dynamic interfacial tension, critical capillary number, concentration of the dispersed phase, flow type and its intensity. For deformation and breakup of droplets, elongation flow is more effective than shear flow. For Newtonian systems, a generally good understanding of dispersed phase morphology has been gained, whereas for viscoelastic systems, no mature theory can precisely describe the dispersion of droplets. The elastic role of fluids is finite although most experiments demonstrated that elasticity stabilizes dorplets.