Biomedical Engineering Reference
In-Depth Information
group shows behavior rather akin to purely viscous film with a constant range
of dynamic elasticity, 0
5 mN m
-1
. Such a differentiation constitutes
a major finding in this analysis scheme, particularly in terms of concordance
between the static and dynamic properties. In the context of the classification
given by Crisp in the early 1940s, the expanded polymer monolayers spread
on water as the good solvent environments are more elastic than viscous. On
the contrary, the condensed polymer monolayers spread on water as the poor
solvent environments are more viscous than elastic. This sort of summary an-
alysis may be better gleaned by determining where the data spread on the
≤
ε
d
≤
Fig. 16
f
s,c,eq
vs.
f
s,eq
for PEO (
A
), PTHF (
B
), PMA (
C
)andPVAc(
D
) are plotted from
s,max
the chain collapse, and the data shown in Fig. 14A are represented by
solid curves
for clarity, that are drawn from Limit I to
∆
ε
s,max
. In each case P increases clockwise from
indicated
20 for PMA (
C
), and
Π
≈
23 for PVAc (
D
), and the unit of
Π
is given in mN m
-1
. Error bars are the same as
giveninthelegendofFig.14,butnotshownforclarity
ε
s,max
to
Π
≈
10 for PEO (
A
),
Π
≈
17 for PTHF (
B
),
Π
≈
