The Effect of Dopant Concentration on the Ionic Conductivity of Liquid PMMA Oligomer

Fabrication and Characterization of High-Performance Crosslinked PVA/ PMDA Doped with H2SO4

“…This behavior is supported by an increase in the C=O band intensity [13]. Conduction occurs via hopping mechanism when H + ions hop from one site to another, leaving a vacancy that will be filled by another H + ion from a neighboring site and may result in the exchange of ions between complex sites [10].…”

“…Figure 3-FT-IR spectra of pure PVA and PVA doped with 5M and 9M H 2 SO 4 Figure 3 shows the FT-IR spectra of pure PVA and PVA doped with 5M and 9M H 2 SO 4 . The strong O-H broad band observed at 3738.05 and 3857.63 m -1 may be assigned to stretching due to the strong hydrogen bond of intramolecular and intermolecular type in PVA film [10]. The C-H stretching vibration was observed at 2920.23 cm -1 [1].…”

“…As observed from these figures, the increase of PMDA concentration increased the length of the polymer chain of the PVA films which increased free volume and ionic mobility in the film with increasing cross-linkages [10,16]. The dielectric behavior of the crosslinked PVA was studied terms of different parameters.…”

“…When PVA was doped with 5M and 9M H 2 SO 4 , a new peak was noticed at 813 cm -1 . This peak may be due to the formation of hydrogen bond between the carbonyl (C=O) group from PVA and the H + ion from the H 2 SO 4 [10]. One can see that the main peaks at 3738.05 cm -1 have become weaker compared with that of the pure PVA; this was due to the elimination of water and hence the fall in hydroxyl content.…”

“…The C-H stretching vibration was observed at 2920.23 cm -1 [1]. The peaks at 2353.16 and 1531.84 cm -1 may be due to the stretching vibration of C=O and C-O of the residual non-hydrolyzed acetate group in the PVA molecular chain [10,11].…”