once again that this brief crystal structure analysis is done for the LB films only and is not

rigorously valid for Langmuir monolayers, because film drying during LB film formation can

lead to further crystallization of the PCL segments. Evidence for crystallization of the PCL

segments in the star-shaped and the linear block copolymer samples directly at the A/W interface

came from the isotherms, the hysteresis, and the isobaric experiments, but no clear conclusions

can yet be drawn in terms of crystal structures in the Langmuir monolayers. BAM experiments

are currently underway to investigate more deeply the in-situ and real-time PCL crystal

growth/melting directly on the water surface for the star-shaped and the linear PEO-b-PCL block

copolymers.






 50n 50n 5nm1



 25nm 25nm 25nm

 0 nm 20 nm 0 n





 S- 20 nm 2u
 50nm 50nm 7.5 nm



 0 nm 0 nm

Figure 4-29. Topographic AFM images of the linear PEO-b-PCL diblock copolymers LB films
 transferred after crystallization of the PCL segment at the A/W interface (7<= 15
 mN/m). (a): PEO60-b-PCLll (b): PEO60-b-PCL19 (c): PEO60-b-PCL27 (d) and (e):
 PEO60-b-PCL35 (f): CTOss-section analysis on PEO60-b-PCL35