0.4 -

 ~L0.35

 E 0.3 -
 0.25-

B) 0.2 -

 ir 0.15-



 O 0.05-
 O


I I I I


compressibility, which is indicative of the PEO phase transition, significantly increases as the

cross-linking proceeds. The monolayer compressibility (K) was calculated from Equation 3-2.


- t, = 0 min
- t, = 20 min
 t, = 30 min
- t, = 40 min
 t, = 60 min
- t, = 100 min
- t, = 600 min


A)


0 20000 40000 60000 80000 100000

 Mean Molecular Area (A2)


- t, = 600 min
- t, = 100 min
 t, = 60 m in
_- t, = 40 min
- t, = 30 min
- t, = 20 min
 t = 0 min


5000


10000


15000


20000 25000


30000


 Mean Mnolecular Area (A2)

Figure 5-18. Surface Pressure-MMA isotherms (A) and compressibility-MMA curves (B) of the
 hydrosilylated (PB(Si(OEt)3)-b-PEO)3 Star block copolymer at various reaction times
 (sub phase pH = 3.0).