Bulk immiscibility

We examined two bulk-immiscible polymers (polystyrene and polyvinyl chloride) that are soluble in THF. " We have not characterized evaporation rates of pure THF droplets, but estimate on the basis of vapor pressure differences relative to water, that evaporation is roughly a factor of 5 more rapid (for a given droplet size). To provide some kind of relative time scale, a water droplet with an initial diameter of 10-pm will evaporate to 1 pm diameter in about 5 ms in a dry Argon atmosphere. ... 

The combination of experimental evidence and computational modeling show conclusively that stable, homogeneously blended (bulk-immiscible) mixed-polymer composites can be formed in a single microparticle of variable size. To our knowledge, this represents a new method for suppressing phase-separation in polymer-blend systems without compatibilizers that allows formation of polymer composite micro- and nanoparticles with tunable properties such as dielectric constant. Conditions of rapid solvent evaporation (e.g. small (<10 pm) droplets or high vapor pressure solvents) and low polymer mobility must be satisfied in order to form homogeneous particles. While this work was obviously focused on polymeric systems, it should be pointed out that the... 

A few pointers on phase equilibrium based separation processes are useful. Table 3.3.1 lists possible useful combinations of two bulk immiscible phases for separation such as gas-liquid (vapor-Uquid included), gas-solid, liquid-liquid, etc. Quite a few of these combinations form the basis of existing separation processes. In this book, therefore, each chapter, from Section 3.3 onwards, focusing on a particular aspect of the subject of separation, has the subject of phase equilibrium driven separation processes organized along sucb two immiscible phase combinations. However, all sucb combinations in practical use do not appear in each chapter. 

Table 3.3.1 Possible useful combinations of turn bulk immiscible phases ...

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