Thermally induced twin polymerization of 4H-1,3,2-benzodioxasilines
| Autor: | Tina Löschner, Patrick Kempe, Stefan Spange, Gerhard Cox, Andreas Seifert, Alexander A. Auer |
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| Rok vydání: | 2014 |
| Předmět: |
Organic Chemistry
technology industry and agriculture macromolecular substances General Chemistry Photochemistry Quinone methide Ring-opening polymerization Catalysis Adduct chemistry.chemical_compound Chain-growth polymerization Monomer chemistry Polymerization Polymer chemistry Molecule Ionic polymerization |
| Zdroj: | Chemistry (Weinheim an der Bergstrasse, Germany). 20(26) |
| ISSN: | 1521-3765 |
| Popis: | The twin monomer 2,2'-spirobi[4H-1,3,2-benzodioxasiline] (1) can be polymerized to nanostructured SiO2/phenolic-resin composite material by thermally induced twin polymerization. Thermally induced twin polymerization represents a way to produce nanocomposites simply by thermal induction of twin monomers. Besides 1, the thermal reaction of several related salicylic (2-oxybenzylic) silicon molecules has been investigated. The thermal cleavage of the molecules is studied by using several trapping reagents (e.g., vinyl compounds). A significant occurrence of quinone methide adducts indicates that the thermal mechanism proceeds not only by a ring opening at the oxymethylene position, but also with the ortho-quinone methide as a central or alternative intermediate. This is supported by product analyses of thermally initialized reactions of 1 and its substituted analogues as well as by quantum chemical calculations. |
| Databáze: | OpenAIRE |
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