Morphology, Dielectric and Thermal Properties of Poly(sulfobutylbetaine)/Montmorillonite (PMBS‐4/MMT) Nanocomposites as Solid Polymer Electrolytes

Abstract

Summary: Polymeric electrolyte composites based on polymer poly(sulfobutylbetaines) (PMBS-4) and 1%, 3% and 5% montmorillonite (MMT) modified with organic ions, dodecyldimethyl(3-sulfo-propyl) ammonium hydroxide (C 12 SB) were synthesized. The structural modification and electrochemical properties of samples were investigated to understand the effects of organic MMT in a polymer matrix on ionic conductivity. The modification of the clay with organic ions resulted in a larger d-spacing which makes easier the penetration of PMBS-4 into the interlayer galleries. The values of T g obtained from differential scanning calorimetry are 18 8C, 20 8C, 20 8C and 27 8C for PMBS-4, PMBS-4/C 12 SB-MMT 1%, PMBS-4/C 12 SB-MMT 3% and PMBS-4/C 12 SB-MMT 5% respectively. Since PMBS-4 and PMBS/C 12 SB-MMT were examined in the absence of Li salt, the conductivity of samples was attributed to the motion of dipoles in chains of zwitterionic PMBS-4. The increase in conductivity with increasing temperature was explained as a local structural relaxation and segmental motion of polymer. The values of s, at 25 8C, for: PMBS-4, PMBS-4/C 12 SB-MMT 1%, PMBS-4/C 12 SB-MMT 3% and PMBS-4/C 12 SB-MMT 5% were 6.2 Â 10 À6 S/cm, 1.2 Â 10 À6 S/cm, 1.7 Â 10 À6 S/cm and 9.1 Â 10 À6 S/cm respectively.

Relaxation dynamics of blends ofPVDFand zwitterionic copolymer by dielectric relaxation spectroscopy

“…[10][11][12][13] Fully zwitterionic polymers tend to be either mechanically weak or water soluble limiting their use in real world applications. [14][15][16][17] Creating polymer blends that incorporate zwitterionic groups would ideally be able to impart the antifouling and biocompatibility of zwitterionic molecules into a mechanically robust system. The blend partner in this work is poly(vinylidene fluoride) (PVDF), a commercial semicrystalline polymer widely used for its mechanical strength and chemical stability.…”