Surfaces of polymer blends and wetting transitions

In Section 7.2.6 we have already discussed that choosing a L x x Lx thin film with two L x L hard walls a distance Lx apart it is simply possible to study surface enrichment of polymer blends, by choosing a wall potential that prefers one component (Fig. 7.21[b]). If we choose conditions such that for a symmetric mixture Na = Nb = N) the system is at a 

Fig- 7.32 (a) Collective structure factor S(q,t) for a symmetric polymer mixture Na NB = N= i2,4 y = 0.6, the model of Figs 7.3 and 7.5 on the simple cubic lattice with f = ab, iAA — = 0 is used) plotted vs. wavenumber q at various times t after a quench from 

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