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    ISSN: 0887-624X
    Keywords: thermolysis of crosslinked polysiloxanes ; redistribution reactions ; Si—C/Si—O and Si—H/Si—O bonds exchange ; thermogravimetric analysis/mass spectroscopy ; solid-state 29Si-NMR ; Chemistry ; Polymer and Materials Science
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology
    Notes: The thermolysis under argon of various polysiloxane resins containing D, T, DH, or TH units was investigated using thermogravimetric analysis combined with mass spectroscopy (TG/MS analysis) and solid-state 29Si-NMR. Redistribution reactions involving the exchange of Si—C/Si—O bonds or Si—H/Si—O bonds were evidenced in addition to the exchange of Si—O/Si—O bonds reported to date. These reactions significantly modify the initial siloxane units and lead to an escape of volatile silanes or siloxanes. The exchange of Si—H/Si—O bonds takes place at lower temperatures (300°C) than the exchange of Si—C/Si—O bonds (500°C).
    Additional Material: 8 Ill.
    Type of Medium: Electronic Resource
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