Thermal volatilisation analysis of TDI-based flexible polyurethane foam

Allan, D. and Daly, J. and Liggat, J. J. (2013) Thermal volatilisation analysis of TDI-based flexible polyurethane foam. Polymer Degradation and Stability, 98 (2). 535–541. ISSN 0141-3910 (https://doi.org/10.1016/j.polymdegradstab.2012.12....)

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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.

ORCID iDs

Allan, D., Daly, J. and Liggat, J. J. ORCID logoORCID: https://orcid.org/0000-0003-4460-5178;
  • Item type:Article
    ID code:43803
    Dates:
    Date
    Event
    February 2013
    Published
    12 December 2012
    Published Online
    Notes:NOTICE: this is the author’s version of a work that was accepted for publication in Polymer Degradation and Stability. Changes resulting from the publishing process, such as peer review, editing, corrections, structural formatting, and other quality control mechanisms may not be reflected in this document. Changes may have been made to this work since it was submitted for publication. A definitive version was subsequently published in Polymer Degradation and Stability, [VOL98, ISSUE2, (Feb 2013)] DOI: 10.1016/j.polymdegradstab.2012.12.002
    Subjects:Science > Chemistry
    Department:Faculty of Science > Pure and Applied Chemistry
    Faculty of Science > Strathclyde Institute of Pharmacy and Biomedical Sciences
    Depositing user: Pure Administrator
    Date deposited:14 May 2013 08:34
    Last modified:19 Nov 2024 01:05
    Related URLs:
    URI:https://strathprints.strath.ac.uk/id/eprint/43803
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