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14), with a steep side reaching a height H next to the three-phase contact line and an approximately exponential decay on the other side, with a decay length D0 [17, 42, 44]. The highly asymmetric shape of the rim suggests that the polymer does not flow like a liquid. , fast with respect to the shortest possible experimental time scale. This would lead to a more symmetric shape. In our experiments, the asymmetric shape of the rim represents a characteristic feature of dewetting of high molecular weight visco-elastic fluids at temperatures close to Tg [17, 37, 38, 41–48].
1) move at approximately the same velocity. Moreover, at the position R the equilibrium value of the contact angle is zero (rim in contact with the film of the same liquid) and thus yields: ð1=2Þ Á gL Á y2dyn ¼ 3=ydyn Á U Á lnðhmax =hmin Þ: (5) Here, hmax and hmin are evaluated at the position R. , the same curvature is assumed to exist everywhere in the rim) requires that ydyn % f. For thin films in the nanometer range and a size of the rim in the range of micrometers, the logarithmic factors at positions R and F are similar.
Reiter D [nm] 700 100 Mw = 125k, T=103°C Mw = 125k, T=105°C Mw = 3900k, T=105°C 0 20 40 t [min] Fig. 13 Hole diameter D as a function of annealing time t for PS films of Fig. 11 annealed at 103 C and 105 C. Note that the molecular weight does not seem to have an influence on the growth rate. 6 (min)] viscous flow of the polymer. This makes it clear that the capillary driving force cannot be balanced by viscous dissipation only. Other resisting forces have to be invoked. Potential candidates are elastic or plastic deformation of the quasi-solid PS film and friction at the PS–PDMS interface.