James R. Stevens

TL;DR: The concept of cooperative rearrangement was introduced in an attempt to unify these two views of the glass transition by demonstrating that such cooperativity, coupled with a thermodynamic glass transition, resulted naturally insystem dynamics such as those described by the WLFequation for temperatures near freezing.

TL;DR: In this article, a comparison between the properties of composite polymeric electrolytes containing inorganic and organic fillers is made based on conductivity data obtained from impedance spectroscopy and structural characteristics based on FT-IR, NMR, DSC and EDX.

TL;DR: In this paper, the conductivity and phase structure of composite polyether-alkali metal salt solid electrolytes are analyzed and discussed and it is suggested that the competition between the Lewis base ether oxygens in the polyether chains and filler Lewis base centres in the complexation of alkali metal cations leads to the formation of different types of complexes and therefore to the modification of the polymer electrolyte ultrastructure.

TL;DR: In this article, the effect of salt concentration on the molal conductivity of various composite electrolytes was studied and it was shown that conductivity enhancement is achieved for composite electrolyte over the basic poly(ethylen...

TL;DR: The symmetric stretch modes for poly(propylene glycol) (PPG) complexed with NaCF3SO3 and LiClO4 at an ether oxygen of alkali metal cation ratio of 16:1 have been studied as a function of the molecular weight of PPG and temperature using Raman spectroscopy.