کد مقاله | کد نشریه | سال انتشار | مقاله انگلیسی | نسخه تمام متن |
---|---|---|---|---|
1295148 | 1498344 | 2010 | 7 صفحه PDF | دانلود رایگان |
In this work, poly(4-vinylbenzeneboronic acid), PVBBA was synthesized via free-radical polymerization of 4-vinylbenzeneboronic acid (4-VBBA) and followed by modification with polyethylene glycol monomethylether (PEGME) with different molecular weights to produce boron containing comb-branched copolymers and abbreviated as PVBBAPEGMEX. Then copolymer electrolytes were successfully prepared by doping of the host matrix with CF3SO3Li at several stoichiometric ratios to get PVBBAPEGMEX-Y (X is the molecular weight of PEGME and Y is the EO/Li ratio). The materials were characterized by using Fourier transform infrared spectroscopy (FT-IR), nuclear magnetic resonance (1H-NMR and 11B-NMR), thermogravimetry (TG) and differential scanning calorimeter (DSC). The ionic conductivity of these novel copolymer electrolytes was studied by dielectric-impedance spectroscopy. Li-ion conductivity of these copolymer electrolytes depends on the length of the side units as well as the doping ratio. Such electrolytes possess satisfactory ambient temperature ionic conductivity (exceeding 10− 4 S/cm) and good mechanical strength. At higher doping ratios, Vogel–Tamman–Fulcher (VTF) behavior of conductivity implies the coupling of the charge carriers with the segmental motion of the polymer chains.
Journal: Solid State Ionics - Volume 181, Issues 21–22, 26 July 2010, Pages 987–993