Structural and thermal studies of PVA:NH4I

Characterization on the potential of carboxy methylcellulose for application as proton conducting biopolymer electrolytes

“…This trend of wavenumber shifting of the stretching vibration of (C_O) towards lower wavenumber is expected due to the certain amount of electrons are withdrawn from the (C_O) moiety to form strong hydrogen bonding between CMC and DTAB weight percent. Similar coordination interaction has been found by Hema et al, [19]. Apparently, the higher the concentration of DTAB added to CMC, resulted in higher concentration of H + , thus, more electrons are withdrawn towards CMC via (C_O) to form hydrogen bonding which can be proven from the shifting of (C_O) stretching to the lower wavenumber and weakening of peak intensity with an increase of weight percent of DTAB added to CMC based BEs system.…”

Effect of plasticizer on ionic transport and dielectric properties of PVA–H3PO4 proton conducting polymeric electrolytes

“…The absorption peaks corresponding to wave numbers 3340 and 2910 cm À 1 are found to be unshifted whereas the peaks corresponding to 1720, 1446 and 1096 cm À 1 are shifted to 1700, 1420 and 1085 cm À 1 , respectively for PVA complexed with H 3 PO 4 . Moreover, all these peaks are observed at 3582, 2855, 1730, 1017 cm À 1 for PVA complexed with H 3 PO 4 using PEG as plasticizer [16]. The shifting of the above mentioned wave numbers for acid doped and plasticizer mixed systems compared to pure PVA gives an insight to a specific interaction of the dopant in the polymer matrix, which clearly confirms the complexation of the system.…”

“…The reduction in T g indicates a weakening of the dipole-dipole interactions between the PVA chains due to the dopants, which facilitates the motion of charge transport through the polymer backbone. The drop in T m values of the polymer electrolytes reveals the disruption of crystalline to amorphous phase [16,17]. Thus, chain flexibility of the polymeric system gets increased due to reduction in T g .…”

Effects of potassium iodide (KI) on crystallinity, thermal stability, and electrical properties of polymer blend electrolytes (PVC/PEO:KI)

“…Therefore the free volume around the polymer chain causes to the increase of the conductivity. The amorphous nature also provides a bigger free volume in the polymer blend electrolyte system with increasing temperature [63][64][65]. The activation energy values of different polymer blend electrolytes were calculated from the slopes of linear fit of the Arrhenius plots of different polymer blend electrolytes and these are displayed in Table 3.…”