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
URL:
http://dx.doi.org/10.1002/pola.1992.080300413
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