Effect of High Pressure on the Electrical Conductivity of ion Conducting Polymers Prepared for Publication in Electrochim. Acta
Abstract
Complex impedance and differential scanning calorimetry (DSC) studies have been carried out on poly(propylene glycol) (PPG) with an average molecular weight of 1025 and poly(ethylene glycol mono- methyl-ether) (PEG) with an average molecular weight of 350, both containing NaCF(3)SO(3) in an approximately 20:1 ratio of polymer to salt. The impedance studies were carried out over a range of frequencies, temperatures and pressures. As expected, PEG:NaCF(3)SO(3) exhibits the tendency to crystallize while PPG:NaCF(3)SO(3) is a glass-forming liquid. The fit to the zero pressure data for PPG:NaCF(3)SO(3) using a recently developed generalized Vogel equation is better than that for the standard VTF equation while for PEG:NaCF(3)SO(3) the two expressions give about the same level of fit to the data. In the theory, the critical temperature, T(c), is allowed to vary with: pressure. The defect-defect separation is assumed to follow the dimensions of the material. It is found empirically that the pressure dependence of T(c) is similar to the pressure dependence of T(g) for structurally related polymers containing no salt. Thus, the difference in the pressure dependence of the conductivity for PEG:NaCF(3)SO(3) and PPG:NaCF(3)SO(3) is attributed primarily to the difference in the pressure dependence of T(g). The details of the relationship between T(c) and T(g) remain to be determined..
Document Details
- Document Type
- Technical Report
- Publication Date
- Jul 01, 2000
- Accession Number
- ADA379733
Entities
People
- J. T. Bendler
- John J. Fontanella
- M. C. Wintersgill
- M. F. Shlesinger
Organizations
- United States Naval Academy