The thermal degradation behaviour of a series of siloxane copolymers - a study by thermal volatilisation analysis

D. Allan, S. C. Radzinski, M. A. Tapsak, J. J. Liggat

Research output: Contribution to journalArticle

4 Citations (Scopus)

Abstract

The thermal degradation behaviour of novel high number average molecular mass polysilalkylenesiloxanes is reported. These have been synthesised using anionic ring-opening polymerisation of 1,1,3,3,14,14,16,16-octamethyl-2,15-dioxa-1,3,14,16-tetrasilacyclohexacosane and octamethylcyclotetrasiloxane (D4) mixtures. The thermal degradation behaviour of these materials was evaluated by a combination of thermogravimetric analysis (TGA) and thermal volatilisation analysis (TVA) and compared with a commercial sample of PDMS. The results demonstrated that the thermal degradation of the polysilalkylenesiloxanes is more complex than the PDMS, with the polysilalkylenesiloxanes exhibiting a lower degradation peak maximum temperature. The major volatile degradation products evolved from the PDMS were identified as D3 to D6 cyclic siloxane oligomers, in addition to higher molecular mass cyclic siloxane oligomers. The polysilalkylenesiloxanes, on the other hand, evolved short chain aliphatic hydrocarbons, cyclic and linear siloxane oligomers and silanes. The TVA results indicate that the polysilalkylenesiloxanes degrade mostly by random chain scission of the polymer backbone, whereas the commercial PDMS degrades by the accepted depolymerisation reaction which involves “back-biting” reactions.

LanguageEnglish
Pages553-562
Number of pages10
JournalSilicon
Volume8
Issue number4
Early online date7 Nov 2014
DOIs
Publication statusPublished - 31 Oct 2016

Fingerprint

Siloxanes
Vaporization
Oligomers
Pyrolysis
Copolymers
Molecular mass
Cyclic Hydrocarbons
Silanes
Degradation
Depolymerization
Anionic polymerization
Ring opening polymerization
Thermogravimetric analysis
Polymers
Hydrocarbons
Hot Temperature
Temperature

Keywords

  • evolved gas analysis
  • polydimethylsiloxane
  • polysilalkylenesiloxane
  • thermal degradation
  • thermogravimetric analysis
  • thermal volatilisation analysis
  • silicon

Cite this

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title = "The thermal degradation behaviour of a series of siloxane copolymers - a study by thermal volatilisation analysis",
abstract = "The thermal degradation behaviour of novel high number average molecular mass polysilalkylenesiloxanes is reported. These have been synthesised using anionic ring-opening polymerisation of 1,1,3,3,14,14,16,16-octamethyl-2,15-dioxa-1,3,14,16-tetrasilacyclohexacosane and octamethylcyclotetrasiloxane (D4) mixtures. The thermal degradation behaviour of these materials was evaluated by a combination of thermogravimetric analysis (TGA) and thermal volatilisation analysis (TVA) and compared with a commercial sample of PDMS. The results demonstrated that the thermal degradation of the polysilalkylenesiloxanes is more complex than the PDMS, with the polysilalkylenesiloxanes exhibiting a lower degradation peak maximum temperature. The major volatile degradation products evolved from the PDMS were identified as D3 to D6 cyclic siloxane oligomers, in addition to higher molecular mass cyclic siloxane oligomers. The polysilalkylenesiloxanes, on the other hand, evolved short chain aliphatic hydrocarbons, cyclic and linear siloxane oligomers and silanes. The TVA results indicate that the polysilalkylenesiloxanes degrade mostly by random chain scission of the polymer backbone, whereas the commercial PDMS degrades by the accepted depolymerisation reaction which involves “back-biting” reactions.",
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The thermal degradation behaviour of a series of siloxane copolymers - a study by thermal volatilisation analysis. / Allan, D.; Radzinski, S. C.; Tapsak, M. A.; Liggat, J. J.

In: Silicon, Vol. 8, No. 4, 31.10.2016, p. 553-562.

Research output: Contribution to journalArticle

TY - JOUR

T1 - The thermal degradation behaviour of a series of siloxane copolymers - a study by thermal volatilisation analysis

AU - Allan, D.

AU - Radzinski, S. C.

AU - Tapsak, M. A.

AU - Liggat, J. J.

N1 - The final publication is available at Springer via http://dx.doi.org/10.1007/s12633-014-9247-6

PY - 2016/10/31

Y1 - 2016/10/31

N2 - The thermal degradation behaviour of novel high number average molecular mass polysilalkylenesiloxanes is reported. These have been synthesised using anionic ring-opening polymerisation of 1,1,3,3,14,14,16,16-octamethyl-2,15-dioxa-1,3,14,16-tetrasilacyclohexacosane and octamethylcyclotetrasiloxane (D4) mixtures. The thermal degradation behaviour of these materials was evaluated by a combination of thermogravimetric analysis (TGA) and thermal volatilisation analysis (TVA) and compared with a commercial sample of PDMS. The results demonstrated that the thermal degradation of the polysilalkylenesiloxanes is more complex than the PDMS, with the polysilalkylenesiloxanes exhibiting a lower degradation peak maximum temperature. The major volatile degradation products evolved from the PDMS were identified as D3 to D6 cyclic siloxane oligomers, in addition to higher molecular mass cyclic siloxane oligomers. The polysilalkylenesiloxanes, on the other hand, evolved short chain aliphatic hydrocarbons, cyclic and linear siloxane oligomers and silanes. The TVA results indicate that the polysilalkylenesiloxanes degrade mostly by random chain scission of the polymer backbone, whereas the commercial PDMS degrades by the accepted depolymerisation reaction which involves “back-biting” reactions.

AB - The thermal degradation behaviour of novel high number average molecular mass polysilalkylenesiloxanes is reported. These have been synthesised using anionic ring-opening polymerisation of 1,1,3,3,14,14,16,16-octamethyl-2,15-dioxa-1,3,14,16-tetrasilacyclohexacosane and octamethylcyclotetrasiloxane (D4) mixtures. The thermal degradation behaviour of these materials was evaluated by a combination of thermogravimetric analysis (TGA) and thermal volatilisation analysis (TVA) and compared with a commercial sample of PDMS. The results demonstrated that the thermal degradation of the polysilalkylenesiloxanes is more complex than the PDMS, with the polysilalkylenesiloxanes exhibiting a lower degradation peak maximum temperature. The major volatile degradation products evolved from the PDMS were identified as D3 to D6 cyclic siloxane oligomers, in addition to higher molecular mass cyclic siloxane oligomers. The polysilalkylenesiloxanes, on the other hand, evolved short chain aliphatic hydrocarbons, cyclic and linear siloxane oligomers and silanes. The TVA results indicate that the polysilalkylenesiloxanes degrade mostly by random chain scission of the polymer backbone, whereas the commercial PDMS degrades by the accepted depolymerisation reaction which involves “back-biting” reactions.

KW - evolved gas analysis

KW - polydimethylsiloxane

KW - polysilalkylenesiloxane

KW - thermal degradation

KW - thermogravimetric analysis

KW - thermal volatilisation analysis

KW - silicon

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JO - Silicon

T2 - Silicon

JF - Silicon

SN - 1876-990X

IS - 4

ER -