Cohesive dispersion index

Dispersive nature (the lower the GDI, Cohesion dispersion index, the higher the retention)... 

The floodability index was calculated from the dispersibility, cohesion, angle of fall, and flowability index parameters. The values for this property ranged from 55 to 76. The most floodable material was lot 4405K5, and the least floodable material lot was the instant sorbitol, which is in agreement with the flow index and the particle size data. The... 

Dispersive Hansen parameters can be predicted from refractive-index measurements of polymers [79]. Wu [100] has suggested an effective cross-sectional area to relate the cohesive energy density and surface tension. 

The molecular refraction is an additive function of atomic refractions. Fluorine has the lowest atomic refraction (Table 13.1) of the atoms used to build compounds or polymers for coating fiber surfaces. Consequently, the refractive index and polarizability of fluorocarbons are lower than those of the corresponding hydrocarbons and chlorocarbons. Because dispersion forces constitute the major part of their cohesive forces, their surface energy is low. However, a low-surface energy is not the sole criterion for an effective soil retardant. The dispersion forces are effective only over short distances. A finish deformable by soil particles provides a larger area in close contact with soil than a finish that does not flow on impact. Hence, hardness of finish is also important. Soiling can also be affected by a liquid film on fibers, such as oil or fat, which can fill the voids between the surfaces of soil and fiber and act as an adhesive. 

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