CBR
SBR
PIB1
CBR
SBR
PIB2
1 mm
1
1 mm
1 mm
1 mm
1 mm
1 mm
Fig. 23 SEM of the gel networks formed from the various rubbers indicated. C R ¼5 %; S 2 Cl 2 ¼
6 % (upper row) and 12 % (bottom row). The degree of unsaturation of PIB was 1.1 % (PIB1) and
2.3 % (PIB2). (From [55] with permission from Elsevier)
Swelling temperature /
o
C
5
1 0
1 5
2 0
m rel
0.4
0.6
0.8
1.0
Strain %
0
2 0
4 0
6 0
8 0
1 0 0
σ / kPa
0
20
40
60
80
CBR CBR
PIB2 PIB2
SBR SBR
PIB2 - 5 %
CBR - 5 %
SBR - 2.5 %
CBR - 2.5 %
SBR - 5 %
b
a
Fig. 24 (a) Normalized weight swelling ratio m rel of conventional gels based on SBR, CBR, and
PIB2 in benzene shown as a function of the swelling temperature. The gels were prepared at 20
C
in the presence of 12 % S 2 Cl 2 . (b) Typical stress–strain data of rubber cryogels. Types of rubber
and the rubber concentration at gel preparation are indicated. (From [55] with permission from
Elsevier)
Synthesis and Structure–Property Relationships of Cryogels
149
SBR
PIB1
CBR
SBR
PIB2
1 mm
1
1 mm
1 mm
1 mm
1 mm
1 mm
Fig. 23 SEM of the gel networks formed from the various rubbers indicated. C R ¼5 %; S 2 Cl 2 ¼
6 % (upper row) and 12 % (bottom row). The degree of unsaturation of PIB was 1.1 % (PIB1) and
2.3 % (PIB2). (From [55] with permission from Elsevier)
Swelling temperature /
o
C
5
1 0
1 5
2 0
m rel
0.4
0.6
0.8
1.0
Strain %
0
2 0
4 0
6 0
8 0
1 0 0
σ / kPa
0
20
40
60
80
CBR CBR
PIB2 PIB2
SBR SBR
PIB2 - 5 %
CBR - 5 %
SBR - 2.5 %
CBR - 2.5 %
SBR - 5 %
b
a
Fig. 24 (a) Normalized weight swelling ratio m rel of conventional gels based on SBR, CBR, and
PIB2 in benzene shown as a function of the swelling temperature. The gels were prepared at 20
C
in the presence of 12 % S 2 Cl 2 . (b) Typical stress–strain data of rubber cryogels. Types of rubber
and the rubber concentration at gel preparation are indicated. (From [55] with permission from
Elsevier)
Synthesis and Structure–Property Relationships of Cryogels
149