355
increases in the following order: TiCl 4 < EtAlCl 2 < AlCl 3 < AlBr 3 (Song et al. 1999).
B(C 6 F 5 ) 3 is effective for the addition of St and its derivatives to primary and secondary silanes (Rubin et al. 2002), while phosphonium salts such as [(C 6 F 5 ) 3 − x Ph x PF]
[B(C 6 F 5 ) 4 ] (x = 0, 1) catalyzes the hydrosilylation of olefines or alkynes with triethylsilane (Et 3 SiH) (Pérez et al. 2013).
By means of the hydrosilylation reaction of Si-H end star tetraarm oligofluorosiloxanes with allyl-glicydyl ether catalyzed by Pt compounds, epoxy-functionalized
siloxanes have been obtained, which have been applied for crosslinking with α,ωbis(3- aminopropyl)-PDMS, which provided thin layers with an increased T g and a
lower wetting angle compared to polysiloxane films (Grunlan et al. 2006).
Through Pt-catalyzed hydrosilylation of alkenes or alkynes with T
H 8 and Q 8 M
H 8
cages, multifunctional POSS derivatives have also been obtained (Zhang et al. 2000;
Sellinger and Laine 1996b; Sheen et al. 2008). Q 8 M
H 8 has also been modified by
reaction with 4-vinyl- 1-cyclohexene to provide tetra(2-cyclohexenylethyl)- and
octa(2- cyclohexenylethyl)octasilsesquioxanes, with melting points ~ 80 and
~ 120 °C, respectively. The tetrabifunctional [cyclohexenylethylMe 2 SiOSiO 1.5 ] 4 (H
Me 2 SiOSiO 1.5 ) 4 has been thermally self-cured, and the octafunctional derivative has
been copolymerized with H-siloxanes, giving transparent hybrid nanocomposites
with good thermostability (up to ≥ 400°C in air) (Takamura et al. 2007).
Supported metallic catalysts and monometalic and dimeric siloxy-Rh complexes
were used by Marciniec et al. (2003a) for the hydrosilylation of 1-hexene, allyl
glycidyl ether and vinylsilanes with random polysiloxanes (MD m D
H n M, m = 0–50,
n = 1–25), at 60 °C in argon or nitrogen atmosphere. With long alkyl chains (> C 8 )
as side groups, silicone waxes were obtained. The Pt supported on a St-divinylbenzene
(DVB) resin gives >90% yield of products, derived from 1-octene and 1-hexadecene
(Marciniec et al. 1999; 2003a, b; 2007a, b; Maciejewski et al. 2006). The hydrosilylation of 1-heptene, allyl glycidyl ether and allyl polyether with M 2 D
H
and PDMSco-PMHS have been catalyzed by Rh(I) complexes in ionic liquids. The Rh-siloxide
catalyst was easily separated from the product and reused up to five times (Marciniec
et al. 2006; Maciejewski et al. 2009). By modifications of PMHS with ether, ester
or carbamate groups have also been synthesized 3-butoxy- and 3-phenoxypropyl(triethoxy)silanes via Rh-catalyzed hydrosilylation of TES with the corresponding
allyl ethers (Marciniec et al. 2007c). The hydrosilylation of allylic methacrylates
with PMHS gave acrylate-functionalized siloxanes (Marciniec et al. 2009). The
catalytic activity and selectivity of other Rh(I), (II) and (III) complexes and
Pt 2 [(ViSiMe 2 ) 2 O] 3 complex were examined by Ganicz et al. (2004) in the hydrosilylation of 1-octene with TES or α-allyl-ω-hydroxy-poly(ethylene oxide) (PEO)
with PDMS-co-PMHS.
Monomeric iridium siloxides ([Ir(cod)(PCy 3 )(OSiMe 3 )] (II), [Ir(CO)
(PPh 3 ) 2 (OSiMe 3) ] (III) and [Ir(CO)(PCy 3 ) 2 (OSiMe 3 )] (IV)) have been effective
homogeneous hydrosilylation catalysts and in the crosslinking of vinyl-terminated
PDMS with PDMS-co-PMHS. The effect of oxygen on the catalytic activity of
phosphine- containing Ir-siloxide complexes has been confirmed. The curing
14 Hydrosilyl-Functional Polysiloxanes: Synthesis Reactions and Applications
increases in the following order: TiCl 4 < EtAlCl 2 < AlCl 3 < AlBr 3 (Song et al. 1999).
B(C 6 F 5 ) 3 is effective for the addition of St and its derivatives to primary and secondary silanes (Rubin et al. 2002), while phosphonium salts such as [(C 6 F 5 ) 3 − x Ph x PF]
[B(C 6 F 5 ) 4 ] (x = 0, 1) catalyzes the hydrosilylation of olefines or alkynes with triethylsilane (Et 3 SiH) (Pérez et al. 2013).
By means of the hydrosilylation reaction of Si-H end star tetraarm oligofluorosiloxanes with allyl-glicydyl ether catalyzed by Pt compounds, epoxy-functionalized
siloxanes have been obtained, which have been applied for crosslinking with α,ωbis(3- aminopropyl)-PDMS, which provided thin layers with an increased T g and a
lower wetting angle compared to polysiloxane films (Grunlan et al. 2006).
Through Pt-catalyzed hydrosilylation of alkenes or alkynes with T
H 8 and Q 8 M
H 8
cages, multifunctional POSS derivatives have also been obtained (Zhang et al. 2000;
Sellinger and Laine 1996b; Sheen et al. 2008). Q 8 M
H 8 has also been modified by
reaction with 4-vinyl- 1-cyclohexene to provide tetra(2-cyclohexenylethyl)- and
octa(2- cyclohexenylethyl)octasilsesquioxanes, with melting points ~ 80 and
~ 120 °C, respectively. The tetrabifunctional [cyclohexenylethylMe 2 SiOSiO 1.5 ] 4 (H
Me 2 SiOSiO 1.5 ) 4 has been thermally self-cured, and the octafunctional derivative has
been copolymerized with H-siloxanes, giving transparent hybrid nanocomposites
with good thermostability (up to ≥ 400°C in air) (Takamura et al. 2007).
Supported metallic catalysts and monometalic and dimeric siloxy-Rh complexes
were used by Marciniec et al. (2003a) for the hydrosilylation of 1-hexene, allyl
glycidyl ether and vinylsilanes with random polysiloxanes (MD m D
H n M, m = 0–50,
n = 1–25), at 60 °C in argon or nitrogen atmosphere. With long alkyl chains (> C 8 )
as side groups, silicone waxes were obtained. The Pt supported on a St-divinylbenzene
(DVB) resin gives >90% yield of products, derived from 1-octene and 1-hexadecene
(Marciniec et al. 1999; 2003a, b; 2007a, b; Maciejewski et al. 2006). The hydrosilylation of 1-heptene, allyl glycidyl ether and allyl polyether with M 2 D
H
and PDMSco-PMHS have been catalyzed by Rh(I) complexes in ionic liquids. The Rh-siloxide
catalyst was easily separated from the product and reused up to five times (Marciniec
et al. 2006; Maciejewski et al. 2009). By modifications of PMHS with ether, ester
or carbamate groups have also been synthesized 3-butoxy- and 3-phenoxypropyl(triethoxy)silanes via Rh-catalyzed hydrosilylation of TES with the corresponding
allyl ethers (Marciniec et al. 2007c). The hydrosilylation of allylic methacrylates
with PMHS gave acrylate-functionalized siloxanes (Marciniec et al. 2009). The
catalytic activity and selectivity of other Rh(I), (II) and (III) complexes and
Pt 2 [(ViSiMe 2 ) 2 O] 3 complex were examined by Ganicz et al. (2004) in the hydrosilylation of 1-octene with TES or α-allyl-ω-hydroxy-poly(ethylene oxide) (PEO)
with PDMS-co-PMHS.
Monomeric iridium siloxides ([Ir(cod)(PCy 3 )(OSiMe 3 )] (II), [Ir(CO)
(PPh 3 ) 2 (OSiMe 3) ] (III) and [Ir(CO)(PCy 3 ) 2 (OSiMe 3 )] (IV)) have been effective
homogeneous hydrosilylation catalysts and in the crosslinking of vinyl-terminated
PDMS with PDMS-co-PMHS. The effect of oxygen on the catalytic activity of
phosphine- containing Ir-siloxide complexes has been confirmed. The curing
14 Hydrosilyl-Functional Polysiloxanes: Synthesis Reactions and Applications