Conductivity, structure, and thermal properties of chitosan‐based polymer electrolytes with nanofillers

Aziz, N.; Majid, S.R.; Yahya, Rosiyah; Arof, A. K.

doi:10.1002/pat.1619

Cited by 35 publications

(12 citation statements)

References 39 publications

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“…However, the band at 1062 cm −1 attributed to the C-O stretching vibration remains unchanged in position. This result is quite similar to that reported by Aziz et al [7]. In the region of 970-1005 cm −1 in figure 4, there is no peak observed in the spectrum of unplasticized chitosan-NH 4 Br film.…”

Section: Resultssupporting

confidence: 92%

“…Problems associated with liquid electrolytes such as solvent vaporization, leakage and corrosion can be avoided, and the mechanical stability and flexibility of packaging design can be improved [2,3]. The development of polymer electrolytes has seen the emergence of natural biopolymers such as starch [4,5], methyl cellulose [6] and chitosan [7][8][9]. Chitosan is obtained from deacetylation of chitin [10], and is useful in a wide range of applications, e.g.…”

Section: Introductionmentioning

confidence: 99%

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Conductivity studies of biopolymer electrolytes based on chitosan incorporated with NH₄Br

et al. 2013

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A polymer electrolyte system based on chitosan complexed with ammonium bromide (NH 4 Br) salt was prepared by the solution cast technique. 30 wt% NH 4 Br added electrolyte gave a room temperature conductivity of (4.38 ± 1.26) × 10 −7 S cm −1 and increased to (2.15 ± 0.47) × 10 −4 S cm −1 with addition of 40 wt% glycerol. The dependence of the conductivity on temperature proves that both chitosan-NH 4 Br and chitosan-NH 4 Br-glycerol systems are Arrhenian. The activation energy (E a) value for 70 wt% chitosan-30 wt% NH 4 Br film is 0.31 eV and the E a value for 42 wt% chitosan-18 wt% NH 4 Br-40 wt% glycerol film is 0.20 eV. The carboxamide band at 1640 cm −1 and the amine band at 1549 cm −1 in the spectrum of pure chitosan film shifted to 1617 and 1516 cm −1 , respectively, in the spectrum of 70 wt% chitosan-30 wt% NH 4 Br film, indicating the occurrence of complexation between polymer and salt. The band at 1024 cm −1 in the pure chitosan film spectrum, which corresponds to the CO stretching vibration, shifted to lower wavenumbers on addition of salt. A new band appears at 997 cm −1 on addition of 40 wt% glycerol.

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Section: Resultssupporting

confidence: 92%

Section: Introductionmentioning

confidence: 99%

Conductivity studies of biopolymer electrolytes based on chitosan incorporated with NH₄Br

et al. 2013

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“…Regarding the literature, some authors could not evaluate T g of chitosan while others observed it ranging from −23 to 67°C, at 30°C, near to 100°C, between 130 and 150°C and between 194 and 196°C . Other authors described it up to 208°C . The main reason for these heterogeneous results may be attributed to some specific features of tested chitosans, such as their origin, molecular weight, deacetylated degree, and crystallinity .…”

Section: Resultsmentioning

confidence: 97%

Physico‐chemical, thermal, and mechanical approaches for the characterization of solubilized and solid state chitosans

Mati‐Baouche

Baynast

Vial

et al. 2014

J of Applied Polymer Sci

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This study was conducted on the both solid and solubilized chitosans to propose an approach for the physico-chemical, thermal and mechanical characterizations of this polysaccharide. The polysaccharide used was a 90% deacetylated chitosan having a molecular weight of 98.4 kDa. The flow property of chitosan solutions was evaluated revealing a shear-thinning behavior. The thermal characterization was carried out by studying heat specific capacity, glass transition temperature, and thermal conductivity on chitosan dried specimens (solid state). Their T g were measured by DSC and confirmed by DMA at 102 and 122 C depending on concentrations of initial chitosan solutions. The mechanical characterization was conducted by analyzing Young modulus, tensile strength, and elongation at break of chitosan specimens. They exhibited a higher elongation at break and a lower tensile strength when made from high concentrated chitosan solution (9% w/v). Differences in mechanical behavior of specimens were explained by differences of crystallinity.

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“…14 Aziza et al have also introduced fillers of inorganic alumina (Al 2 O 3 ) to analyze their influence on the structure, conductivity, and thermal properties of chitosan-based polymer electrolytes. 15 Cardoso et al have shown that the zwitterionic groups on the polymer structures are able to interact with different types of inorganic salts in a 1:1 molar ratio, without compromising the phase separation i.e. LiClO 4, CF 3 LiO 3 S (lithium triflate) and LiCl.…”

Section: Introductionmentioning

confidence: 98%

Synthesis, Characterization, and Theoretical Insights of Green Chitosan Derivatives Presenting Enhanced Li⁺Ionic Conductivity

Cardoso¹,

Nava²,

García-Morán

et al. 2015

J. Phys. Chem. C

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The synthesis, thermal, dielectric and conductivity properties of functionalized chitosan polymer derivatives are evaluated to determine their potential uses as a non-toxic electrolyte/separator for lithium batteries. Deacetylated chitosan (DAC) at 97% is used as a precursor to prepare two derivatives: N-propylsulfonic acid chitosan (SC), chitosan with zwitterionic pendant groups (ZWC). These derivatives increase the polar character of pure chitosan, and significantly improve its solubility. Likewise, they are thermally stable up to 220 °C, and their glass transition temperatures (Tg) are located in the region where they decompose, except for SC (Tg=158 ºC). The incorporation of the sulfobetaine and zwitterionic pendant groups improves the ionic conductivity at least two orders of magnitude with respect to pure chitosan at 25 °C, without the use of plasticizers or further modifications. The salt addition (LiPF 6 or LiClO 4 ) to ZWC does not modify the conductivity, whence it is suggested that its increase is due to an electronic modification, such that the energy barriers for conducting the Li + across the ZWC become decreased (i.e. charge dislocation), rather than a salt dissociation. This experimental finding is confirmed with Density Functional Theory (DFT) calculations conducted with the SC and ZWC structures.

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Conductivity, structure, and thermal properties of chitosan‐based polymer electrolytes with nanofillers

Cited by 35 publications

References 39 publications

Conductivity studies of biopolymer electrolytes based on chitosan incorporated with NH₄Br

Conductivity studies of biopolymer electrolytes based on chitosan incorporated with NH₄Br

Physico‐chemical, thermal, and mechanical approaches for the characterization of solubilized and solid state chitosans

Synthesis, Characterization, and Theoretical Insights of Green Chitosan Derivatives Presenting Enhanced Li⁺Ionic Conductivity

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Conductivity, structure, and thermal properties of chitosan‐based polymer electrolytes with nanofillers

Cited by 35 publications

References 39 publications

Conductivity studies of biopolymer electrolytes based on chitosan incorporated with NH4Br

Conductivity studies of biopolymer electrolytes based on chitosan incorporated with NH4Br

Physico‐chemical, thermal, and mechanical approaches for the characterization of solubilized and solid state chitosans

Synthesis, Characterization, and Theoretical Insights of Green Chitosan Derivatives Presenting Enhanced Li+Ionic Conductivity

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Product

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Conductivity studies of biopolymer electrolytes based on chitosan incorporated with NH₄Br

Conductivity studies of biopolymer electrolytes based on chitosan incorporated with NH₄Br

Synthesis, Characterization, and Theoretical Insights of Green Chitosan Derivatives Presenting Enhanced Li⁺Ionic Conductivity