chains are able to segregate on the hydrophilic substrate. This tempering results in a
stratification of the polymer film, with PS on the topmost layer and with a PEO layer
segregated on the silicon surface as indicated by the water contact angles of 84–88
.
An analogous preference for PS over PEO towards the free surface was observed
for PS-PEO diblock copolymers [240]. This is caused by the lower surface tension
Fig. 61 (a) X-ray reflectivity of silicon surfaces after grafting-to process with PS 27 -(TEOS)PEO 261 (top) and PS 27 -(AGE)-PEO 261 (bottom). A fringe could only be observed in the case of
block copolymers functionalized with TEOS. (b) Sessile water drop on silicon surface after
grafting-to process with PS 27 -(TEOS)-PEO 261 , after tempering and treatment with DMF under
reflux. A contact angle change of 20
was observed. The scheme shows PS (red) and PEO (blue)
chain alignment upon thermal treatment [237c]
Fig. 62 AFM (a) phase and (b) height (total z range 1.7 nm) images of surface covered with
surface-confined junction-point reactive block copolymer PS-(TEOS)-PEO
Structure Formation of Polymeric Building Blocks: Complex Polymer Architectures
187
stratification of the polymer film, with PS on the topmost layer and with a PEO layer
segregated on the silicon surface as indicated by the water contact angles of 84–88
.
An analogous preference for PS over PEO towards the free surface was observed
for PS-PEO diblock copolymers [240]. This is caused by the lower surface tension
Fig. 61 (a) X-ray reflectivity of silicon surfaces after grafting-to process with PS 27 -(TEOS)PEO 261 (top) and PS 27 -(AGE)-PEO 261 (bottom). A fringe could only be observed in the case of
block copolymers functionalized with TEOS. (b) Sessile water drop on silicon surface after
grafting-to process with PS 27 -(TEOS)-PEO 261 , after tempering and treatment with DMF under
reflux. A contact angle change of 20
was observed. The scheme shows PS (red) and PEO (blue)
chain alignment upon thermal treatment [237c]
Fig. 62 AFM (a) phase and (b) height (total z range 1.7 nm) images of surface covered with
surface-confined junction-point reactive block copolymer PS-(TEOS)-PEO
Structure Formation of Polymeric Building Blocks: Complex Polymer Architectures
187