Table 3 (continued)
Polymeric precursor (its
concentration in the
feed)
Solvent
Conditions of cryotropic gel formation
What was done and reported References
Freezing
temperature
Frozen
storage
duration
Thawing
rate
Number of freeze–
thaw cycles
(
C)
(h)
(
C/min)
depended on the number
of freeze–thaw cycles
105.6/99.6
(10–15 wt%)
À20 to
À40
and
partial
lyophylization
12–24
À
1
Preparation of PVA
cryogels via
polymer solution
freezing with the
additional partial
lyophilization;
evaluation of
mechanical
strength of final
gel species
[9, 300,
301]
66/99 (10–16 wt%)
DMSO
(T
0
¼ +18.4
C)
À10
20
À
1
Apparently the first report
on the possibility of
PVA cryotropic gelation
in frozen organic
medium
[30]
69/99 (10 wt%)
Water
À15
12
À
1
Evidence of the noncovalent
nature of intermolecular
links in PVA cryogels
[302]
90/98 (8 wt%)
À10
24
110/97.5 (6 wt%)
À20
18; 240
95.6–110 or 98–99
(0.003 g/dL)
À25; À196
24
1–9
[303, 304]
iPVA: 660/99.9 (9 wt%) Water
À20
20
À
1–4
Evidence of the key role of
H-bonding for
[305–307]
30
V.I. Lozinsky