Issue 45, 2008
From the journal:

Physical Chemistry Chemical Physics

A mechanistic study of cyclic siloxane pyrolyses at low pressures†

Matthew J. Almond,a   Rosa Becerra,b   Sarah J. Bowes,c   John P. Cannady,d   J. Steven Ogden*c  and  Robin Walsh*a  

* Corresponding authors

a School of Chemistry, University of Reading, Whiteknights, P.O. Box 224, Reading, UK
E-mail: r.walsh@reading.ac.uk

b Instituto de Quimica-Fisica, “Rocasolano”, C.S.I.C., C/Serrano 119, Madrid, Spain

c School of Chemistry, University of Southampton, Highfield, Southampton, UK
E-mail: jso@soton.ac.uk

d Dow Corning Corporation, Mail Stop C012322200 West Salzburg Road, P.O. Box 994, Midland, Michigan, USA

Abstract

Matrix isolation IR spectroscopy has been used to study the vacuum pyrolysis of hexamethylcyclotrisiloxane (D3), octamethylcyclotetrasiloxane (D4) and decamethyl cyclopentasiloxane (D5), and the results interpreted in the context of various kinetic models. In particular, it is shown that the significant pyrolysis products—which include CH3, CH4, C2H2, C2H4, C2H6 and SiO—may be satisfactorily accounted for by radical reactions involving dimethylsiloxane (D1), and estimates are made of the various chain lengths for the proposed reactions based on a range of ambient conditions.

Graphical abstract: A mechanistic study of cyclic siloxane pyrolyses at low pressures

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Article information

DOI
https://doi.org/10.1039/B812535J
Article type
Paper
Submitted
21 Jul 2008
Accepted
01 Sep 2008
First published
09 Oct 2008

Phys. Chem. Chem. Phys., 2008,10, 6856-6861

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A mechanistic study of cyclic siloxane pyrolyses at low pressures

M. J. Almond, R. Becerra, S. J. Bowes, J. P. Cannady, J. S. Ogden and R. Walsh, Phys. Chem. Chem. Phys., 2008, 10, 6856 DOI: 10.1039/B812535J

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