Journal
POLYMER DEGRADATION AND STABILITY
Volume 180, Issue -, Pages -Publisher
ELSEVIER SCI LTD
DOI: 10.1016/j.polymdegradstab.2020.109313
Keywords
Thermal stability; Rigid PU-PIR foam; Tall oil fatty acids; TGA; DTA; FTIR
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Funding
- European Regional Development Fund [1.1.1.1/16/A/031]
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This study is an investigation of the suitability of the thermogravimetry and differential thermal analysis method coupled with Fourier Transform Infrared spectrometry (TG/DTA-FTIR) for a thermal degradation gaseous product analysis of a rigid polyurethane-polyisocyanurate (PU-PIR) foam synthesised from high functionality tall oil fatty acids (TOFA) based polyols. The FTIR spectra of the TG-generated gaseous thermal degradation products of three PU-PIR formulations with varied high functionality TO based polyol content (45, 75 and 95 pbw) and a different tier of isocyanate (NCO) indexes (110, 150, 200, 300 and 400) for each formulation were compared to the spectra of a formulation developed using conventional raw materials. The chemical bands of known chemical compounds and unknown compounds containing specific groups for the foams were evaluated; the focus was on the maximum release rate for specific chemical compounds (CO2; -NCO; H2O; C=O) to determine the temperature zone values of the main thermal degradation phases. The experiments were carried out at a low oxygen environment, providing valuable data on the trends for the excretion of specific gaseous substances from the rigid PU-PUR foam that could be released in a real fire, where organic building materials that possess a porous matrix might be present and the nature of the combustion process is predominantly heterogeneous oxidation. (C) 2020 Elsevier Ltd. All rights reserved.
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