Correlation length and chain size

The upper part of the phase diagram (Fig. 5.1) corresponds to good solvents. At low concentrations, polymer coils are far from each other and behave as isolated real chains (see Section 3.3.1.1). At temperatures for which the excluded volume interaction within each chain exceeds the thermal energy kT, they begin to swell. The Flory theory prediction for the size of swollen real chains with excluded volume v /y/N is ihs, same as the result for a self-avoiding walk of thermal blobs [Eq. (3.77)]  

Chains begin to overlap when their volume fraction 

The overlap concentration decreases with chain length more rapidly than in -solvent, with 4 since the exponent v = 0.588. The quality of solvent and the excluded volume increase with temperature and therefore, 

If the range of a monomer s CB radio is shorter than the correlation length the monomer can only talk with monomers on the same chain, whereas if the range 

This small section of a chain is hardly aware that the solution is semidilute--------extends beyond the correlation length. 

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