End group analysis accounts for the low molecular weight observed in the 1,3-divinyltetramethyldisiloxane-Pt complex catalyzed hydrosilylation copolymerization of α, ω-dienes and 1,3-dihydridotetramethyldisiloxane

doi:10.1021/MA981461W

Paper

End group analysis accounts for the low molecular weight observed in the 1,3-divinyltetramethyldisiloxane-Pt complex catalyzed hydrosilylation copolymerization of α, ω-dienes and 1,3-dihydridotetramethyldisiloxane

Published Apr 9, 1999 · J. Sargent, W. Weber

Macromolecules

Q1 SJR score

19

Citations

1

Influential Citations

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Abstract

The 1,3-divinyltetramethyldisiloxane−Pt complex (Karstedt catalyst) facilitates copolymerization of α,ω-dienes, such as 1,7-octadiene or 1,5-hexadiene, with 1,3-dihydridotetramethyldisiloxane. Spectroscopic analysis of the copolymers indicates the presence dimethylsiloxy and either 2-octenyl or 2-hexenyl end groups. Apparently, the catalyst not only facilitates the hydrosilylation reaction of 1,3-dihydridotetramethyldisiloxane with terminal C−C double bonds but also catalyzes the isomerization of terminal alkenes to internal alkenes, which are not reactive.

Study Snapshot

The 1,3-divinyltetramethyldisiloxane-Pt complex catalyzes hydrosilylation copolymerization of, -dienes and 1,3-dihydridotetramethyldisiloxane, enabling the production

PopulationOlder adults (50-71 years)

Sample size24

MethodsObservational

OutcomesBody Mass Index projections

ResultsSocial networks mitigate obesity in older groups.

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Paper

End group analysis accounts for the low molecular weight observed in the 1,3-divinyltetramethyldisiloxane-Pt complex catalyzed hydrosilylation copolymerization of α, ω-dienes and 1,3-dihydridotetramethyldisiloxane

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References

Citations

Careful investigation of the hydrosilylation of olefins at poly(ethylene glycol) chain ends and development of a new silyl hydride to avoid side reactions

The developed silyl hydride significantly improves hydrosilylation efficiency at polymer chain ends, reducing side reactions and improving polymer quality.

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Optimum crosslinker levels in liquid silicone rubber vulcanizates improve mechanical and thermal properties, with curing kinetics following a first-order reaction at various temperatures.

Functionalized polysilalkylene siloxanes (polycarbosiloxanes) by hydrosilylation—Catalysis and synthesis

Catalytic hydrosilylation is a convenient route for synthesizing new functional materials like polysilalkylene siloxanes, offering new opportunities for added value applications and industrial importance.

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This study successfully synthesized linear carbosiloxane/hydrocarbon homopolymers, which can be combined with chain-internal/chain-end latent crosslinking to create new silicon-based thermoset systems with mechanical properties up to 0.5 MPa and elongations up to 100%.

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