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Study of the Morphological Hysteresis in Immiscible Polymer Blends by Mario Minale; Jan Mewis; Paula Moldenaers is a Engineering article available to read on EtoBox.

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The effect of processing conditions (essentially the flow conditions) on the mophology of incompatible, immiscible polymer blends was investigated. In simple shear flow the steady-state mophology, that is, droplet size, of such blends is a single-ualued finction of the shear rate whenever a critical shear rate is exceeded. Below this critical value it becomes uely dificult to reach a dynamic equilibrium between droplet breakup and coalescence, which gives rise to a hysteresis region for the size of the inclusions. Such regions were identified and studied for model-blend systems. The critical shear rate decreases with increasing concentration of the droplet phase. A large ratio of droplet over matrix viscosity seems to have the opposite effect. The hysteresis region is bounded by the critical curues for droplet breakup and coalescence. The accessibility of this region can therefore be used to evaluate models for the said phenomena in nondilute systems. Droplet breakup is nearly independent of droplet concentration, while elasticity of the dispersed phase seems to facilitate breakup. As expected, coalescence is enhanced by higher concentrations. Droplet elasticity induces a certain d

Who reads Study of the Morphological Hysteresis in Immiscible Polymer Blends?

Author

Mario Minale; Jan Mewis; Paula Moldenaers

Publisher

American Institute of Chemical Engineers; Wiley (John Wiley & Sons); Wiley-Blackwell; Wiley (ISSN 0001-1541)

Published

1998

Language

EN

Field

Engineering (Physical Sciences)