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Scaling model of real chains

Several examples of scaling with different types of scaling blobs have already been introduced for tension, compression, and adsorption. The main idea in all scaling approaches is a separation of length scales. The [Pg.113]

In this section, we will consider the excluded volume interaction follow-ing a similar scaling approach, rhe main idea is that of a thermal length scale (the thermal blob). On length scales smaller than the thermal blob size the excluded volume interactions are weaker than the thermal energy kT and the conformations of these small sections of the chain are nearly ideal. The thermal blob contains gr monomers in a random walk conformation  [Pg.113]

The thermal blob size can be estimated by equating the Flory excluded volume interaction energy [Eq. (3.17)] for a single thermal blob and the thermal energy kT. [Pg.113]

In this section, we discuss both good (v 0) and poor (v 0) solvents and therefore, use v in the definition of the thermal blob. The above two equations are combined to estimate the number of monomers in a thermal blob [Pg.113]

The thennal blob size is the length scale at which excluded volume becomes important. For v the thermal blob is the size of a monomer Ht b) and the chain is fully swollen in an athermal solvent [Eq. (3.12)]. For V —b, the thermal blob is again the size of a monomer ( 7- Ri b) and [Pg.114]


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