Infrared absorptions characteristic of organic carbonate derivatives and related compounds
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Cellulose nanocrystals modification by grafting from ring opening polymerization of a cyclic carbonate
2022, Carbohydrate PolymersCitation Excerpt :First, the band at 1754 cm−1 can be identified as a carbonyl stretch ν(C=O), thus confirming the successful incorporation of the carbonate moieties onto CNCs. A second characteristic band is observed at 1229 cm−1 corresponding to ν(CO) stretching (Nyquist & Potts, 1961). As shown in Fig. 3, the relative intensity of both bands increased with the grafting content, thus confirming the results determined by elemental analysis and TGA.
The coupling of CO<inf>2</inf>with diols promoted by organic dual systems: Towards products divergence via benchmarking of the performance metrics
2020, Journal of CO2 UtilizationCitation Excerpt :This was attributed to a change in the anionic environment of protonated DBU, due to the time consumption of the RCO3- species that are progressively replaced by the bromine anions of EtBr. Concomitantly, two novel absorption bands appeared around 1743 cm−1 and 1796 cm−1 and were respectively assigned to the CO stretching mode of a linear alkyl carbonate [58] IntLC (see Scheme 3) and to the vibrational stretching of the CO function of a 5-membered cyclic carbonate [58], i.e. propylene carbonate (PC) (See ESI 2). So far, the ATR-IR analysis could not differentiate IntLC from diethyl carbonate (DEC) co-produced at the end of the reaction.
Long term stability of biodegradable polymers on building limestone
2019, Progress in Organic CoatingsCitation Excerpt :On the other hand, Paraloid B72 increases the water repellency (hydrophobicity) of stone surfaces while hydrophobicity decreases due to the weathering effects. Paraloid B72 penetrates into the pores of stones producing a uniform surface and, due to outdoor conditions, it is subjected to weathering through UV light exposure, which causes degradation by chain scissions, photoinduced crystallization and cross linking [7–19]. UV irradiation leads to color changes and loss of surface hydrophobicity depending on the relative intensity of the radiation [3,7].
Photo-oxidative stability of paraloid acrylic protective polymers
2001, PolymerCitation Excerpt :Acid formation occurs by photo-induced decomposition of the isobutyl groups through a molecular mechanism involving interaction between the carbonyl group and hydrogen atoms on the β carbon atom of the ester (Scheme 2)[30]. The evolution of acids to anhydrides, either by inter- or intramolecular elimination of water, and the corresponding infrared absorptions of the different CO groups, may justify the broadening of the carbonyl peak at wavenumbers higher than 1750 cm−1[31,36]. The formation of intermolecular anhydrides could be the main route to cross-linking, and the delay in detection of gel fractions may be related to the time interval necessary for reaching the required concentration of acid groups.