
6 Engineering of Polymers and Chemical Complexity
ρ
1
+
=
R
p
(%) (2)
Where R = WR
c
, WR
s
, or CXR (ml/g).
MERCURY POROSIMETRY
Pore structure of freeze dried PHEMA scaffolds was characterized on a mercury poro-
simeter Pascal 140 and 440 (Thermo Finigan, Rodano, Italy). It works in two pressure
intervals, 0–400 kPa and 1–400 MPa, allowing determination of meso- (2–50 nm),
frequent pore diameter were calculated under the assumption of a cylindrical pore
model by the PASCAL program. It employed Washburn’s equation describing capil-
lary flow in porous materials [33]. The volumes ...