0000000000181726
AUTHOR
Sanita Reinerte
Identification and Evaluation of Hazardous Pyrolysates in Bio-Based Rigid Polyurethane-Polyisocyanurate Foam Smoke
In this study, rigid polyurethane (PU) and polyisocyanurate (PIR) foam samples made from renewable material (tall oil fatty acid) based polyols were analyzed by pyrolysis gas chromatography mass spectrometry (Py-GC/MS) to obtain information about the full relative smoke content, with a focus on substance identification by their functional groups and hazardousness. The relative content of gaseous products produced during the thermal degradation was evaluated between the two samples, differenced by their assigned isocyanate (NCO) index value—150 and 300. The main thermal degradation components of the rigid PU-PIR foam were found to originate from the decomposition of isocyanate, primarily for…
Ķīmisko elementu satura izvērtējums Madonas novada ābolos
Ķīmisko elementu satura izvērtējums Madonas novada ābolos. Reinerte S., zinātniskais vadītājs Dr. ķīm., doc. Rudoviča V. Bakalaura darbs, 39 lpp., 14 attēli, 8 tabulas, 28 literatūras avoti, 9 pielikumi, latviešu valodā. Darbā veikta ķīmisko elementu kvantitatīvā analīze Madonas novadā ievāktajos ābolos. Izvērtēts elementu (Ca, K, Cu, Fe, Mg, P, Cd, Pb) saturs ābolos, atkarībā no paraugu ņemšanas vietas urbanizācijas. Elementu kvantitatīvā satura analīze veikta izmantojot viļņu dispersijas rentgenfluorescences spektrometrijas, liesmas un elektrotermālās atomabsorbcijas spektrometrijas un liesmas fotometrijas metodes.
Thermal degradation of highly crosslinked rigid PU-PIR foams based on high functionality tall oil polyol
Abstract This study presents the development and analysis of rigid polyurethane-polyisocyanurate (PU-PIR) foam synthesized from high functionality tall oil (TO) based polyols. 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 a formulation developed using conventional raw materials, mainly obtained from petrochemicals. Using the Fourier transform infrared spectral analysis (FTIR), the chemical structure of the foams was evaluated with emphasis on the characteristic PU-PIR signal ratio and isocyanurate signal peaks. The thermal…
TG/DTA-FTIR as a method for analysis of tall oil based rigid polyurethane foam decomposition gaseous products in a low oxygen environment
Abstract 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 …