Quantification of specific interactions between CO2 and the carbonyl group in polymers via ATR-FTIR measurements

ATR-FTIR study of the interaction of CO2 with bacterial cellulose-based membranes

“…The order of the CO2 bending vibrational frequencies is υ (in-plane bending of associated CO2) < υ (free CO2) < υ (out-of-plane bending of associated CO2) (Yuan and Teja, 2011). As we know, the wavenumber is inversely proportional to wavelength whereas it is directly proportional to the frequency and energy, hence, this frequency order is the same as to the order of wavenumber ("Infrared Spectroscopy").…”

“…When CO2 takes part in the formation of an electron donor-acceptor complex, the splitting of the CO2 bending absorption band occurs (Yuan and Teja, 2011). Figure 29 shows the resolved IR spectra of the basic BC samples; control and 16h condition.…”

Measurement of enthalpies of association between CO2 and polymers via in situ ATR-FTIR spectroscopy

“…Spectroscopic studies and ab initio calculations have both shown that CO 2 readily forms electron donor-acceptor (EDA) complexes with electron donating functional groups in polymers [1][2][3][4]. These complexes can have a significant effect on the swelling [5][6][7][8], plasticization [7,9], viscosity [10], and glass transition properties [7,9,11] of polymers and thereby affect polymer processing [12], membrane technology [13], and drug delivery [14].…”

“…On the other hand, Kazarian et al [5] and Higuchi and Nakagawa [18] have noted that shifts in the antisymmetric stretching vibration of CO 2 are not large enough to measure Lewis acid-base interactions between the carbonyl group in poly (methyl methacrylate) (PMMA) and CO 2 . Finally, ab initio calculations [2,3,19] and experimentally determined FTIR and Raman spectra [1,4,10,20,21] have been employed to show that the bending mode (v 2 ) of CO 2 changes significantly in the presence of electron donating groups. Indeed, Kazarian el al.…”

“…[5] noted that the degeneracy of the bending mode of CO 2 diminishes in the presence of a polymer with carbonyl groups. This was confirmed in the case of poly (methyl methacrylate) (PMMA), poly (vinyl acetate) (PVAc), poly (carbonate) (PC), Propoxy based polyester (P120) and ethoxy based polyester (P130), poly (phenylene oxide) (PPO), poly (ethylene glycol) (PEG), poly(lactide-co-glycolide) (PLGA), and poly (lactide) (PLA) and several other poly (esters) [4,10,20]. Although most of these studies were qualitative in nature, a few quantitative results have also been published [1][2][3]5,15,22].…”