Dynamic mechanical properties of gel polymer electrolytes containing ionic liquid

Tang, Zhenglin; Qi, Li; Gao, Guitian

doi:10.1016/j.ssi.2008.05.011

Cited by 20 publications

(13 citation statements)

References 16 publications

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“…Although the glass transitions are not observable in the DSC thermograms, both the main and side chain glass transitions of the comblike polymer are observed in DMA measurements. [23] The thermal stability of the gel polymer electrolytes copolymer-BMImBF 4 (50) and copolymer-BMImBF 4 (50)-LiClO 4 ([LiClO 4 ] ¼ 1.0 mol kg À1 polymer) are studied by thermogravimetric analysis as shown in Figure 2. As noticed, the TGA curves of the gel polymer electrolytes containing ionic liquid show three-step thermal degradation processes.…”

Section: Thermal Studiesmentioning

confidence: 99%

Structural, thermal, and impedance properties of a gel polymer electrolyte containing ionic liquid

Tang

Gao

2009

Polymers for Advanced Techs

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The gel polymer electrolytes composed of ionic liquid, 1-butyl-3-methylimidazolium tetrafluoroborate (BMImBF 4 ) and the copolymer of acrylonitrile (AN), methyl methacrylate (MMA), poly(ethylene glycol) methyl ether methacrylate (PEGMEMA) are synthesized and characterized by FT-IR spectra, TGA, DSC, and AC impedance measurements. IR spectra show that there is an interaction between PEO side chains of the copolymer and imidazolium cations. TGA measurements indicate that the gel polymer electrolytes are stable until 120-C. By using the equivalent circuit proposed, the experimental data and the simulated data fit very well. The bulk resistance R b is found to decrease with the increase in BMImBF 4 content.

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Section: Thermal Studiesmentioning

confidence: 99%

Structural, thermal, and impedance properties of a gel polymer electrolyte containing ionic liquid

Tang

Gao

2009

Polymers for Advanced Techs

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“…Since the T g is a marker of the segmental motions, when decreased the Tg it is expected to increase the conductivity of the system [11].…”

Section: Introductionmentioning

confidence: 99%

Dielectric properties of lithium-perchlorate-filled acrylonitrile-hexyl methacrylate copolymer films

et al. 2015

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A series of poly(acrylonitrile‐co‐hexyl methacrylate), PAN‐co‐PHMA, copolymers with various hexyl methacrylate (HMA) contents were synthesized by emulsion technique. The incorporation of HMA units into the copolymers was confirmed by Fourier transform infrared and proton nuclear magnetic resonance (1H‐NMR) spectroscopy. Glass transition temperatures (Tg) and thermal decomposition temperatures of copolymers were determined by differential scanning calorimetry and thermogravimetric analysis. The Tg of copolymers were lowered monotonically by increasing HMA content, while thermal stabilities of copolymers were enhanced. The frequency dependence of dielectric properties of three different amounts of LiClO4 salt doped copolymer films was investigated. The influence of molar fraction of HMA on dielectric constant and ac‐conductivity of copolymer films was examined. Samples with higher HMA contents showed better stability and conductivity, as a result of increase in free volume and the mobility of the dipoles. The ac conductivity of copolymers was also improved by increasing LiClO4 salt which was due to the existence of more charge carriers. PAN(88)‐co‐PHMA(12) copolymer with 1.5 mol% of lithium salt exhibited ionic conductivity of the 7.8 × 10−4 S/cm at 298 K. POLYM. COMPOS., 38:1792–1799, 2017. © 2015 Society of Plastics Engineers

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“…The Arrhenius plot can thus yield the activation energy (Ea) for what is termed the relaxation process. In the last years the Arrhenius equation has been applied to various polymer systems aiming the determination of the activation energy of some relaxations, as for example the glass transition, due to the application of Arrhenius equation in the prediction of long-term material performance [6][7][8][9][10][11][12][13][14] . It was also reported that monitoring the activation energy of the glass transition can be useful for detecting changes due to material aging [10] .…”

Section: Introductionmentioning

confidence: 99%

Influence of hydroxypropyl cellulose on molecular relaxations of epoxy-amine networks

et al. 2013

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Abstract:A dynamic mechanical analysis (DMTA) study was conducted on epoxy-amine networks crosslinked in the presence of low contents of hydroxypropyl cellulose (HPC). The epoxy resin chosen was diglycidylether of bisphenol-A (DGEBA) and the crosslinker was 4,4'-diaminodiphenylmethane (DDM). In the glassy region, primary (α) and secondary (β, γ) relaxations originating from the epoxy and HPC components were well detected. Two primary relaxations of neat epoxy and epoxy/HPC systems, referred to as α epoxy and α' epoxy , could be detected, showing a particular glassy behavior for the systems studied in comparison with systems cured in bulk. The main relaxation temperature T α (at the peak of α epoxy relaxation) of the epoxy systems increased slightly with the addition of HPC. The activation energy for this transition (T α ) of the epoxy-amine networks was determined both from tan δ and the peak temperatures for the loss modulus measured at various frequencies. The activation energy of the α epoxy relaxation determined from the loss modulus was more reliable than that based on tan δ. The addition of HPC lowered the activation energy of this α epoxy relaxation.

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Dynamic mechanical properties of gel polymer electrolytes containing ionic liquid

Cited by 20 publications

References 16 publications

Structural, thermal, and impedance properties of a gel polymer electrolyte containing ionic liquid

Structural, thermal, and impedance properties of a gel polymer electrolyte containing ionic liquid

Dielectric properties of lithium-perchlorate-filled acrylonitrile-hexyl methacrylate copolymer films

Influence of hydroxypropyl cellulose on molecular relaxations of epoxy-amine networks

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