Photodegradation of Polyurethane Foam Obtained from Renewable Resource–Pulp Production Byproducts

The Study on Application of Biopolyols Obtained by Cellulose Biomass Liquefaction Performed with Crude Glycerol for the Synthesis of Rigid Polyurethane Foams

“…In the range of 1705-1715 cm − 1 , lowering of peaks' intensity is observed, which is related to the UV-induced oxidation of C=O. The absorption bands characteristic for the aromatic ring (1510, 1410 cm − 1 ) are also reduced, showing that aromatic structures in polyurethanes are unstable in UV radiation [51].…”

“…Both methods of aging result in the significant decrease of the intensity or even disappearance of the signal attributed to the vibrations of N=C=O groups around 2260-2280 cm − 1 . Such effect can be related to the chemical reactions involving these groups, supported by the UV radiation and elevated temperature [51]. Moreover, after aging of foams, noticeable differences in the shape and intensity of signals around 3290-3320 cm − 1 (stretching vibrations of N-H bonds in urethane groups) can be observed, which points to decomposition of urethane groups.…”

Photochemical weathering of polyurethane microplastics produced complex and dynamic mixtures of dissolved organic chemicals

“…Previous research was mainly conducted under dry conditions and heavily focused on the chemistry of residual polymers. [29][30][31][32][33][34][35][36][37] Recently, studies on the characterization of the DOC produced from PP, PE, PS, and polyethylene terephthalate (PET) have shown how nontarget HRMS-based methods can lead to the identication of unknown photo-oxidation products. 11,[38][39][40][41] Condent identication cannot be achieved without reference standards or spectral library match, 40,42 and the data reduction of HRMS identication workows is such that only a minor fraction of the many thousands of detectable signals can be structureannotated.…”

The Influence of Substitution of a Phosphorus-Containing Polyol with the Bio-polyol on the Properties of Bio-based PUR/PIR Foams

“…Photo-oxidative aging produces a new band near 1770 cm −1 which indicates the formation of carbonyl groups by oxidation. The band between 2900 and 2928 cm −1 comes from CH 2 and is connected to chemical reactions involving these groups, under the influence of UV radiation and elevated temperatures [55]. There is also a change in the intensity and shape of the band at 3299-3325 cm −1 (N-H stretching) which indicates the breakdown of urethane groups by UV radiation.…”