Application of multifunctional silylenes and siliranes as universal crosslinkers for metal-free curing of silicones

Autor:	Philipp J. Altmann, Matthias Nobis, Daniel Wendel, Bernhard Rieger, Philipp Pahl, Fabian A. D. Herz, Jan Tillmann, Shigeyoshi Inoue, Richard Weidner
Rok vydání:	2020
Předmět:	Addition reaction Materials science Thermal decomposition Silylene Elastomer Pollution Peroxide chemistry.chemical_compound Silicone chemistry Chemical engineering Nucleophile Environmental Chemistry Curing (chemistry)
Zdroj:	Green Chemistry. 22:4489-4497
ISSN:	1463-9270 1463-9262
Popis:	Conventional industrial crosslinking of silicones is usually done by the well-established tin-catalysed condensation, platinum-catalysed addition or peroxide curing. We report the first application of highly reactive multifunctional silylenes as universal crosslinkers for catalyst-free curing of standard industrial silicones. The reactive silylene species is generated by thermal decomposition of stable silacyclopropane precursors and reacts with various functionalities of silicone building blocks in an addition reaction. Alternatively, the multifunctional silacyclopropanes can be ring-opened by nucleophilic compounds like siloxanols, which can also be employed for network formation with standard nucleophilic siloxanes. These new crosslinking methods are not dependent on non-recoverable Pt- or toxic Sn-catalysts and enable the production of clean, extractable-free elastomers. We describe the synthesis of multifunctional siliranes as model compounds and their application in silicone curing.
Databáze:	OpenAIRE
Externí odkaz:	https://explore.openaire.eu/search/publication?articleId=doi_________::3cc7e523d63c18651d13cee094ba0f2f https://doi.org/10.1039/d0gc00272k Zobrazit plný text záznamu