333
Si((OSiMe 2 ) n OSiMe 2 H) 4 ) Tetraarm star H-terminated polydimethylsiloxanes
Si(OSiMe 2 H) 4
Tetrakis(dimethylsiloxy)silane
SiOC
Silicon oxycarbide
SRs
Silicone rubbers
St
Styrene
TEA
Triethylamine
TEMPO
2,2,6,6-tetramethylpiperidine-N-oxyl
TEOS
Tetraethoxysilane - Si(OC 2 H 5 ) 4 - Si(OEt) 4
TES
Triethoxysilane - HSi(OC 2 H 5 ) 3 - HSi(OEt) 3
TFA
Trifluoromethanesulfonic acid - triflic acid - CF 3 SO 3 H
T g
Glass transition temperature
TGA
Thermogravimetric analysis
T
H
Hydrosilsesquioxane unit - HSiO 1.5
T
H 8
Octahydrooctasilsesquioxane - (HSiO 1.5 ) 8 - H 8 Si 8 O 12
THF
Tetrahydrofuran
T i
Isotropic transition temperatures
T m
Melting temperature
TMCS
Trimethylchlorosilane - Me 3 SiCl
TMOS
Tetramethoxysilane - Si(OMe) 4
TMSD
Tetramethyldisiloxane-1,3-diol
ViSi(OEt) 3
Vinyltriethoxysilane
VMDMS
Vinylmethyldimethoxysilane
δ
Chemical shifts
14.1 Introduction
Poly(hydrosiloxane)s (PHS) are inorganic-organic hybrid polymers with inorganic
backbone, compounds of alternatively connected silicon and oxygen atoms. In PHS
as substituents at silicon atoms there are hydrogen atoms, methyl or other organic
groups. PHS are an important group of silicones, which contain pendant or/and end
hydrosilane functional groups (White 1995; Kricheldorf 1996; Chruściel 1999a;
Brook 2000; Rościszewski and Zielecka 2002).
A Si-H bond is a very attractive functional group used for the crosslinking of silicone elastomers and preceramic polymers in order to protect their shape (e.g. fibers)
(Chojnowski 1987; Laine and Babonneau 1993; Rościszewski and Zielecka 2002).
They are especially used for addition of different organic groups to silicon atom,
e.g. via hydrosilylation (Sauer 1952) or nucleophilic substitution reactions (White
1995; Kricheldorf 1996; Chruściel 1999a; Brook 2000; Rościszewski and Zielecka
2002), which lead to the manufacture of materials with better properties. The Si-H
group was also very often linked to conventional organic polymers in order to modify their properties.
14 Hydrosilyl-Functional Polysiloxanes: Synthesis Reactions and Applications
Si((OSiMe 2 ) n OSiMe 2 H) 4 ) Tetraarm star H-terminated polydimethylsiloxanes
Si(OSiMe 2 H) 4
Tetrakis(dimethylsiloxy)silane
SiOC
Silicon oxycarbide
SRs
Silicone rubbers
St
Styrene
TEA
Triethylamine
TEMPO
2,2,6,6-tetramethylpiperidine-N-oxyl
TEOS
Tetraethoxysilane - Si(OC 2 H 5 ) 4 - Si(OEt) 4
TES
Triethoxysilane - HSi(OC 2 H 5 ) 3 - HSi(OEt) 3
TFA
Trifluoromethanesulfonic acid - triflic acid - CF 3 SO 3 H
T g
Glass transition temperature
TGA
Thermogravimetric analysis
T
H
Hydrosilsesquioxane unit - HSiO 1.5
T
H 8
Octahydrooctasilsesquioxane - (HSiO 1.5 ) 8 - H 8 Si 8 O 12
THF
Tetrahydrofuran
T i
Isotropic transition temperatures
T m
Melting temperature
TMCS
Trimethylchlorosilane - Me 3 SiCl
TMOS
Tetramethoxysilane - Si(OMe) 4
TMSD
Tetramethyldisiloxane-1,3-diol
ViSi(OEt) 3
Vinyltriethoxysilane
VMDMS
Vinylmethyldimethoxysilane
δ
Chemical shifts
14.1 Introduction
Poly(hydrosiloxane)s (PHS) are inorganic-organic hybrid polymers with inorganic
backbone, compounds of alternatively connected silicon and oxygen atoms. In PHS
as substituents at silicon atoms there are hydrogen atoms, methyl or other organic
groups. PHS are an important group of silicones, which contain pendant or/and end
hydrosilane functional groups (White 1995; Kricheldorf 1996; Chruściel 1999a;
Brook 2000; Rościszewski and Zielecka 2002).
A Si-H bond is a very attractive functional group used for the crosslinking of silicone elastomers and preceramic polymers in order to protect their shape (e.g. fibers)
(Chojnowski 1987; Laine and Babonneau 1993; Rościszewski and Zielecka 2002).
They are especially used for addition of different organic groups to silicon atom,
e.g. via hydrosilylation (Sauer 1952) or nucleophilic substitution reactions (White
1995; Kricheldorf 1996; Chruściel 1999a; Brook 2000; Rościszewski and Zielecka
2002), which lead to the manufacture of materials with better properties. The Si-H
group was also very often linked to conventional organic polymers in order to modify their properties.
14 Hydrosilyl-Functional Polysiloxanes: Synthesis Reactions and Applications