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).