Gaussian behavior blobs

Free, isolated, collapsed chains may be viewed as a spherical arrays of close packed collapse blobs. Collapse blobs, like screening blobs, occur because of binary monomer-monomer interactions. However, screening blobs occur in good solvents when the binary interactions are repulsive while collapse blobs resiJt from attractive monomer-monomer interactions in a poor solvent. When the temperature is not too far below the 6 temperature, the associated interaction energy is weak enough so as not to perturb the Gaussian behavior of short chain segments. Quantitatively the collapse blob is defined by the combination of vg / c ... 

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