372
the network of copolymers (Isayeva and Kennedy 2004). By hydrosilylation of α,ωunsaturated polyoxyalkylenes with PMHS were prepared different silicone- organic
elastomer gels (Andre et al. 2000; Homrighausen and Keller 2002; Lin et al. 2012;
Kennan et al. 2010, Kennan and Messner 2010).
Recently, silicone elastomers and type RTV SRs, were prepared from
poly(dimethylsiloxane-α,ω-diols), which were crosslinked with linear and branched
PMHS and PMHBS in the presence of DBTDL (Table 14.3) (Chruściel 2019).
As crosslinkers were used branched PMHS of the following chemical structures:
T D M T D M T D M T D M ,
H
H
H
H
3
102
3
9
112
11
12
100
14
22
135
24
,
,
,
T D D M T D D M T D D M T D D M ,
H
H
H
H
3 51
5 1
5
9 56
5 6
11
12 50
5 0
14
2 2 90
9 0
2 4
,
,
,
Q D M Q D M Q D D M Q D D M ,
H
H
H
H
2
4 9
6
3
5 0
8
2 49
4 9
6
3 50
5 0
8
,
,
,
and branched PMHBS:
B O D D M B O D D M B O D D M ,
H
H
H
6 5 78
78
8
9 8 57
5 7
11
9 8 114
114
11
,
,
B O T D D M B O T D D M B O T D D M B O
H
H
H
3 5
3
70
7 0
8
6 11
6
52
52
14
9 11
3
52
52
14
3
’
,
’
,
’
,
8 8
6
70
70
11
T D D M .
H
’
Elastic silicone (Chruściel et al. 2011c) and PU (Chruściel and Fejdyś 2012) foams
with a low density, controlled size of pores and decreased flammability were prepared using PMHS as a crosslinker and foaming agent. The self-extinguishing SFs
were obtained from polysiloxane mixtures (Chruściel et al. 2011d) composed of:
A. α,ω-(dihydroxy)polydimethylsiloxanes (PDMS-diols),
B. PDMS-diols and α,ω-bis(γ-hydroxypropyl)polydimethylsiloxanes (PDMS-X2),
C. PDMS-diols, PDMS-X2 and α,ω-bis(trimethylsiloxy)poly[dimethyl-comethyl(γ-hydroxypropyl)]siloxanes - with the addition of different fire
retardants (FRs, mainly, melamine and/or expanded graphite) and water, crosslinkeed with branched polysiloxanes of random structures (T x D
H y M z where:
T = MeSiO 1.5 , D
H
= MeHSiO, M = Me 3 SiO 0.5 ) (br-PMHS), using tin octoate as
Table 14.3 Summary of the mechanical properties of the RTV silicone elastomers and rubbers,
prepared by crosslinking of poly(dimethylsiloxane-α,ω-diols) with branched PMHS and PMHBS
SiO 2 [wt.%]
(with respect to PDMS)
TS (MPa)
Elongation at break (E b ) (%)
0
0.4–0.5
80–170
10
1.0–2.1
200–510
20
2.5–3.4
240–350
Source: Chruściel (2019)
J. J. Chruściel
the network of copolymers (Isayeva and Kennedy 2004). By hydrosilylation of α,ωunsaturated polyoxyalkylenes with PMHS were prepared different silicone- organic
elastomer gels (Andre et al. 2000; Homrighausen and Keller 2002; Lin et al. 2012;
Kennan et al. 2010, Kennan and Messner 2010).
Recently, silicone elastomers and type RTV SRs, were prepared from
poly(dimethylsiloxane-α,ω-diols), which were crosslinked with linear and branched
PMHS and PMHBS in the presence of DBTDL (Table 14.3) (Chruściel 2019).
As crosslinkers were used branched PMHS of the following chemical structures:
T D M T D M T D M T D M ,
H
H
H
H
3
102
3
9
112
11
12
100
14
22
135
24
,
,
,
T D D M T D D M T D D M T D D M ,
H
H
H
H
3 51
5 1
5
9 56
5 6
11
12 50
5 0
14
2 2 90
9 0
2 4
,
,
,
Q D M Q D M Q D D M Q D D M ,
H
H
H
H
2
4 9
6
3
5 0
8
2 49
4 9
6
3 50
5 0
8
,
,
,
and branched PMHBS:
B O D D M B O D D M B O D D M ,
H
H
H
6 5 78
78
8
9 8 57
5 7
11
9 8 114
114
11
,
,
B O T D D M B O T D D M B O T D D M B O
H
H
H
3 5
3
70
7 0
8
6 11
6
52
52
14
9 11
3
52
52
14
3
’
,
’
,
’
,
8 8
6
70
70
11
T D D M .
H
’
Elastic silicone (Chruściel et al. 2011c) and PU (Chruściel and Fejdyś 2012) foams
with a low density, controlled size of pores and decreased flammability were prepared using PMHS as a crosslinker and foaming agent. The self-extinguishing SFs
were obtained from polysiloxane mixtures (Chruściel et al. 2011d) composed of:
A. α,ω-(dihydroxy)polydimethylsiloxanes (PDMS-diols),
B. PDMS-diols and α,ω-bis(γ-hydroxypropyl)polydimethylsiloxanes (PDMS-X2),
C. PDMS-diols, PDMS-X2 and α,ω-bis(trimethylsiloxy)poly[dimethyl-comethyl(γ-hydroxypropyl)]siloxanes - with the addition of different fire
retardants (FRs, mainly, melamine and/or expanded graphite) and water, crosslinkeed with branched polysiloxanes of random structures (T x D
H y M z where:
T = MeSiO 1.5 , D
H
= MeHSiO, M = Me 3 SiO 0.5 ) (br-PMHS), using tin octoate as
Table 14.3 Summary of the mechanical properties of the RTV silicone elastomers and rubbers,
prepared by crosslinking of poly(dimethylsiloxane-α,ω-diols) with branched PMHS and PMHBS
SiO 2 [wt.%]
(with respect to PDMS)
TS (MPa)
Elongation at break (E b ) (%)
0
0.4–0.5
80–170
10
1.0–2.1
200–510
20
2.5–3.4
240–350
Source: Chruściel (2019)
J. J. Chruściel