Dimethylsilanone Generation from Pyrolysis of Polysiloxanes Filled with Nanosized Silica and Ceria/Silica. Issue 9 (27th June 2016)

• Record Type: Journal Article
• Authors: Kulyk, Kostiantyn; Zettergren, Henning; Gatchell, Michael; Alexander, John D.; Borysenko, Mykola; Palianytsia, Borys; Larsson, Mats; Kulik, Tetiana
• Is Part Of: ChemPlusChem. Volume 81:Issue 9(2016)
• Page Start: 1003
• Page End: 1013
• Publication Date: 2016-06-27
• Subjects: kinetics -- mass spectrometry -- polysiloxanes -- pyrolysis -- silica; Chemistry -- Periodicals; 540.5
• DOI: 10.1002/cplu.201600229
• Languages: English
• ISSNs: 2192-6506

Abstract

Abstract: Temperature‐programmed desorption mass spectrometry (TPD MS) was used to study the pyrolysis of PDMS and its composites with nanosized silica and ceria/silica. The results suggest that the elusive organosilicon compound, dimethylsilanone, is generated from PDMS over a broad temperature range (in some cases starting at 70 °C). The presence of nano‐oxides catalyzes this process. Ions characteristic of the fragmentation of dimethylsilanone under electron ionization are assigned with the aid of DFT structure calculations. Possible reaction mechanisms for dimethylsilanone generation are discussed in the context of the calculated kinetic parameters. Observed accompanying products of PDMS pyrolysis, such as tetramethylcyclodisiloxane and hexamethylcyclotrisiloxane, indicate that multiple channels are involved in the dimethylsilanone release. Abstract : Polydimethylsiloxane pyrolysis : Dimethylsilanone generation during pyrolysis of polydimethylsiloxane and its nanocomposites with silica and ceria/silica is studied through desorption mass spectrometry (see figure).