Polymer brushes solvent treatment

Figure 5.8 Schematic diagram showing switching behavior of mixed polymer brushes upon treatment with different selective solvents.

When D < 2Lh, the brushes apparently interpenetrate (but see below when shearing motion is discussed), relative motion of polymer and solvent occurs and solvent molecules experience increased drag. Assuming that for these cases the concentration of polymer is uniform, the flow of solvent was analysed by the treatment used for flow in porous media (Brinckman 1947). In this approximation j/o in equation (3.4.13) is replaced by an effective viscosity, for which a scaling relation was obtained ... 

Figure 19.22 Photoluminescence spectra of polymer brush, PFi6-Z7-PPEGMA92-Z -PPOPSn, after treatment with mixed solvent of toluene and methanol excited at the wavelength of 380 nm. (Reprinted with permission from W.-C. Wu, Y. Tian, C.-Y. Chen et aL, Theoretical and experimental studies on the surface structures of conjugated rod—coil block copolymer brushes, Langmuir, 23, 2805-2814, 2007. 2007 American Chemical Society.)...

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