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Figure 4.1: Schematic of the formation of a linear chain of m segments from m associating
spheres.


4.2.3 Equilibrium density profile

Substituting the free energy functional derivatives in Euler-Lagrange eqn. 4.2 for

a segment a gives

lnpα5(r) +

^AEX,hs ^AEX,att

+^ <5∕⅛es(r) + δpsaeg(r) ~ Va


nse9 / x b У contact [{Pα 9 (r 1 ) }] ,

^(ri)---⅛7W---

(4.22)


The set of these non-linear equations (for m segments) can be solved with eqn. 4.9 for
Хд, for the density profile of the segments. However, in eqn. 4.9, Хд for a segment
a depends on +1 for segment a + 1. This coupling of Хд and X⅛+1 leads to
numerical complexities. This interdependence is decoupled for a linear chain (of m
segments, see fig. 4.1) by simultaneously solving eqn. 4.22 for the segment densities
and eqn. 4.9 for the
X%,s. The derivation is shown in the appendix. It should be
noted that the approach can be extended to branched chains, as shown in chapter 7.
The final expressions for
Хд and X⅛ are given by

92



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