Thermal volatilisation analysis of TDI-based flexible polyurethane foam

D. Allan, J. Daly, J. J. Liggat

Research output: Contribution to journalArticle

31 Citations (Scopus)

Abstract

The thermal degradation behaviour of a polyurethane foam, synthesised from TDI and a polyether polyol, is reported. The thermal degradation behaviour of this material was evaluated by a combination of thermogravimetric analysis (TGA) and thermal volatilisation analysis (TVA). The results demonstrated that the thermal degradation is a complex process which consists of competing mechanisms which yield an array of degradation products. The TVA results revealed that the degradation occurs in two steps, with the initial step corresponding to degradation of the urethane linkages by two competing mechanisms. The first mechanism, proposed to be the predominant mechanism, involves simple depolymerisation of the urethane bond to yield TDI and polyol. A second, competing mechanism is proposed to occur which involves dissociation of the urethane linkages to yield DAT, CO2 and alkene-terminated polyol chains. The second degradation step has been shown to involve degradation of the polyol which was regenerated in the first degradation step. This is proposed to occur by random radical chain scission of the polyol to yield propene, formaldehyde, acetaldehyde, C3H6O isomers and high molar mass polyol chain fragments of various structures. Isothermal TVA studies have revealed that this occurs as low as 250 degrees C under vacuum but does not become significant until temperatures greater than 300 degrees C.

LanguageEnglish
Pages535–541
Number of pages7
JournalPolymer Degradation and Stability
Volume98
Issue number2
Early online date12 Dec 2012
DOIs
Publication statusPublished - Feb 2013

Fingerprint

polyurethane foam
vaporizing
Polyols
Vaporization
Polyurethanes
Foams
degradation
Degradation
urethanes
thermal degradation
Urethane
Pyrolysis
linkages
depolymerization
Depolymerization
Acetaldehyde
Molar mass
acetaldehyde
Polyethers
Alkenes

Keywords

  • polyurethane foams
  • TDI
  • evolved gas analysis
  • mechanism

Cite this

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title = "Thermal volatilisation analysis of TDI-based flexible polyurethane foam",
abstract = "The thermal degradation behaviour of a polyurethane foam, synthesised from TDI and a polyether polyol, is reported. The thermal degradation behaviour of this material was evaluated by a combination of thermogravimetric analysis (TGA) and thermal volatilisation analysis (TVA). The results demonstrated that the thermal degradation is a complex process which consists of competing mechanisms which yield an array of degradation products. The TVA results revealed that the degradation occurs in two steps, with the initial step corresponding to degradation of the urethane linkages by two competing mechanisms. The first mechanism, proposed to be the predominant mechanism, involves simple depolymerisation of the urethane bond to yield TDI and polyol. A second, competing mechanism is proposed to occur which involves dissociation of the urethane linkages to yield DAT, CO2 and alkene-terminated polyol chains. The second degradation step has been shown to involve degradation of the polyol which was regenerated in the first degradation step. This is proposed to occur by random radical chain scission of the polyol to yield propene, formaldehyde, acetaldehyde, C3H6O isomers and high molar mass polyol chain fragments of various structures. Isothermal TVA studies have revealed that this occurs as low as 250 degrees C under vacuum but does not become significant until temperatures greater than 300 degrees C.",
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Thermal volatilisation analysis of TDI-based flexible polyurethane foam. / Allan, D.; Daly, J.; Liggat, J. J.

In: Polymer Degradation and Stability, Vol. 98, No. 2, 02.2013, p. 535–541.

Research output: Contribution to journalArticle

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