Mild route to convert SiH compounds to their alkoxy analogues

Alena Juraskova, Michael A. Brook*, Anne Ladegaard Skov

*Corresponding author for this work

Research output: Contribution to journalJournal articleResearchpeer-review

Abstract

Alkoxysilanes, particularly ethoxysilanes, are widely used as cross-linkers for the moisture-induced, room-temperature vulcanization (RTV) of silicones. Karstedt's platinum catalyst is shown to be effective at converting commercially available small hydrosiloxanes containing 1−8 SiH groups, and higher molecular weight telechelic and pendant hydrosiloxane polymers, into the corresponding alkoxy compounds. Kinetic studies demonstrated that relatively high concentrations of platinum-500 ppm- were required for practical reaction rates to be realized. As with other silyl ether-forming processes, steric hindrance at both carbon (alcohol) and silicon centers retard the reaction progress. This alternative use of the platinum catalyst, employed widely in the silicone industry, permits the ready formation of small molecule and polymeric RTV alkoxysiloxane cross-linkers that can be used to tailor network structures.
Original languageEnglish
JournalIndustrial and Engineering Chemistry Research
Volume59
Issue number41
Pages (from-to)18412-18418
ISSN0888-5885
DOIs
Publication statusPublished - 2020

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