A Study of the Deformation, Network, and Aging of Polyethylene Oxide Films by Infrared Spectroscopy and Calorimetric Measurements

Abstract

The calorimetric and infrared (IR) spectroscopy measurements of polyethylene oxide (PEO) are used to evaluate the deformation and relaxation that films experience during a temperature cycle (30°C–90°C–30°C). After melting, the intensity of some bands decreases by 10 to 70%. During the temperature cycle, the C–O band in the 1100 cm−1 region and the C–C–O deformation bands at 650 and 500 cm−1 show some new features. A network of cooperative oxygen-hydrogen interactions between the PEO chains form in films with special history, namely, in thermally treated films, in thin films prepared from gel forming solutions, and in thick films after aging. The interchain interaction network is suggested from the IR absorption bands in the 1200 and 900 cm−1 region and also from small bands at 1144 and 956 cm−1. The network seems absent or reduced in thin films. IR spectroscopy appears a sensitive technique to study chain conformations in PEO films and in other materials where order, disorder, and the formation of intermolecular interactions coexist.

Understanding the Molecular Structure of the Elastic and Thermoreversible AlCl3 : Urea/Polyethylene Oxide Gel Electrolyte

“…Figure shows the FTIR spectra of the PEO50‐1/U150 gel (PGE), U150, PEO, and a PEO/urea 1 : 1 inclusion compound (IC). As discussed elsewhere, the most intense FTIR band of solid PEO is not seen in the PGE, namely the characteristic backbone band centered at 1095 cm −1 assigned to combinations of stretching C−C and C−O, and COC deformation modes, which are very conformationally‐sensitive . However, the CH 2 twisting bands at 1241 and 1278 cm −1 , which are far less intense than the 1095 cm −1 band, are hinted in the PGE's spectrum (red rectangle in Figure ).…”

“…As discussed elsewhere, [9] the most intense FTIR band of solid PEO is not seen in the PGE, namely the characteristic backbone band centered at 1095 cm À 1 assigned to combinations of stretching CÀ C and CÀ O, and COC deformation modes, which are very conformationally-sensitive. [16] However, the CH 2 twisting bands at 1241 and 1278 cm À 1 , which are far less intense than the 1095 cm À 1 band, are hinted in the PGE's spectrum (red rectangle in Figure 5). Other PEO bands do not appear in the PGE's spectrum: the CH 2 rocking at 840 cm À 1 and the CH 2 wagging at 1342 and 1360 cm À 1 .…”

Tough Polymer Gel Electrolytes for Aluminum Secondary Batteries Based on Urea: AlCl3, Prepared by a New Solvent-Free and Scalable Procedure

“…The region of 1400 to 800 cm −1 in PEO spectra is very sensitive to conformational changes. Interestingly, in the PGEs, the most intense FT-IR bands of solid PEO were not seen, namely the characteristic band centered at 1095 cm −1 (marked with a black arrow), assigned to combinations of stretching C-C and C-O, and COC deformation modes in conformation trans-gauche-trans, of the structural unit O-C-C-O [ 25 ]. There were other PEO bands which did not appear in the PGE spectra like the CH 2 rocking at 840 cm −1 or the CH 2 wagging at 1342 and 1360 cm −1 .…”

Structural and vibrational studies on composites polymer electrolytes (PEO)10CF3COONa + x wt.% Al2O3

“…The semi-crystalline character of samples are affected by addition of Al 2 O 3 particles, that addition increase the amorphous phase in the new composite, producing changes in the intensity and broadening of the Raman peaks. Figure 3 shows the IR spectra for pure PEO, CF 3 COONa, the polymer electrolyte (PEO) 10 [29,36,37] (a in Figure 3) overlaps the lines at 508 and 529 cm -1 assigned to C-O-C stretching of in the principal chain of PEO [38,39]; however, for the highest Al 2 O 3 concentration the three peaks are clearly defined.…”