Studies on structure property relationship in a polymer–clay nanocomposite film based on (PAN)₈LiClO₄

Abstract

A new combination of ionically conducting polymer-clay nanocomposites based on (PAN) 8 LiClO 4 þ x wt % montmorillonite (unmodified) clay has been prepared using the standard solution cast process. X-Ray diffraction (XRD) analysis reveals strong interaction of polymer salt complex (PS) with the montmorillonite matrix evidenced by changes in d 001 spacing of the clay and enhancement in the clay gallery width on composite formation possibly due to intercalation of polymer-salt complex into nanometric clay galleries. Evidences of such an interaction among polymer-ion-clay components of the composite matrix has also been observed in the Fourier transform infrared (FTIR) spectrum results. FTIR results clearly indicated cation (Li þ ) coordination at nitrile (CBN) site of the polymer backbone along with appearance of a shoulder suggesting strong evidence of polymer-ion interaction. Addition of clay into the PS matrix has been observed to affect ion-ion interaction resulting from ion dissociation effect at low clay loading in the PNC films. Complex impedance spectroscopy (CIS) analysis has provided a response comprising of a semicircular arc followed by a spike attributed respectively, to the bulk conduction and electrode polarization at the interfaces. Electrical transport appears to be predominantly ionic (t ion ¼ 0.99) with significant improvement in the electrical conductivity and thermal stability properties. Figure 10. Complex impedance spectrum (CIS) of PNC films [(PAN) 8 LiClO 4 þ x wt % Montmorillonite (MMT)] of different clay concentration at room temperature.

Insights into the use of polyethylene oxide in energy storage/conversion devices: a critical review

“…FTIR spectroscopy concludes that addition of filler is effective in loosening/stiffening of the polymeric segments. As cations coordinate with four ether oxygen in PEO-salt complexes and an ion-polymer interaction results in two types of transient cross-links (inter-or intramolecular) of polyether chains [131][132]. The filler Na 2 SiO 3 is basically an inert oxide with a net dipolar shift in the dielectric medium and SnO 2 is the oxide of basically acidic nature.…”

Effect of Nano-Filler on the Properties of Polymer Nanocomposite Films of PEO/PAN Complexed with NaPF6

“…Such as shifting of host polymer PEO characteristic peak at 19.2 º , and 23.6 º toward low angle with the addition of nano-filler, increasing d-spacing and lowering in the peak intensity. These changes observed among components of PNC films during XRD analysis may be due to microscopic interaction and these provide supportive evidence at microscopic level [15].…”

Tailoring the Structural, Morphological, Electrochemical, and Dielectric Properties of Solid Polymer Electrolyte

“…So, to completely understand the enhancement of the ionic conductivity it is important to separate out the ionic and electronic contribution [43][44]. Ionic transference number was measured by Wagner's DC polarization technique at a fixed applied voltage (20 mV) across the cell SS/SPE polymer electrolyte/SS (@ RT).…”