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Do‐it‐yourself functionalized silicones part 2: synthesis by ring opening polymerization of commercial cyclosiloxanes
Author(s) -
Yactine Bashim,
Ratsimihety Amédée,
Ganachaud François
Publication year - 2010
Publication title -
polymers for advanced technologies
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.61
H-Index - 90
eISSN - 1099-1581
pISSN - 1042-7147
DOI - 10.1002/pat.1509
Subject(s) - cationic polymerization , molar mass , polymerization , materials science , polymer , silicone , polymer chemistry , ring opening polymerization , silicon , chemical engineering , composite material , engineering , metallurgy
The second paper of the series devoted to the preparation and characterization of vinyl and hydrido‐functionalized silicones proposes readily available techniques to polymerize commercially available cyclosiloxanes. This study is divided into two main sections: one relies on the synthesis of various functional silicone oils by heterogeneous cationic ring opening polymerization (ROP) of cyclotetrasiloxanes (D 4 , D H 4 ) and appropriate 1,3‐difunctional disiloxanes; the second part describes the anionic ROP of hexamethylcyclotrisiloxane (D 3 ) initiated by potassium silanolates to prepare both homo‐ and hetero‐vinyl functionalized silicones. The conditzions in which polymers with desired molecular weights can be obtained have been established and some kinetic considerations are also reported. The width of the final molar mass distribution ranged between 1.5 and 1.8, respectively, in any case narrower than the mixtures proposed by different providers (around 2). Polymers were characterized by different techniques of size exclusion chromatography (SEC), proton and silicon nuclear magnetic resonance ( 1 H and 29 Si NMR), and mass spectrometry. Copyright © 2009 John Wiley & Sons, Ltd.