Conductivity and dielectric relaxation in crosslinked PVA by oxalic and citric acids

Fattoum, A.; Arous, M.; Pedicini, R.; Carbone, A.; Charnay, Clarence

doi:10.1134/s0965545x15030049

Cited by 12 publications

(7 citation statements)

References 23 publications

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“…[5,51] Based on the physicochemical properties of cross-linked PVA, it has been used in drug delivery, [52] tissue engineering, [43,53] wound dressing, [54] food packaging, [45] antibacterial membrane against the polluted air, [55,56] in desalination of water as reverse osmosis (RO) membrane, [57] pervaporation process, [58,59] filtration/separation of metal ions, [60] and solid polymer electrolytes. [61][62][63] As mentioned above, a number of studies have been reported on carboxylic acid cross-linked PVA. These studies generally focus on the application of carboxylic acid cross-linked PVA on a specific field such as pervaporation, RO, wound dressing, drug delivery, and fuel cells.…”

Section: Introductionmentioning

confidence: 99%

“…[ 5,51 ] Based on the physicochemical properties of cross‐linked PVA, it has been used in drug delivery, [ 52 ] tissue engineering, [ 43,53 ] wound dressing, [ 54 ] food packaging, [ 45 ] antibacterial membrane against the polluted air, [ 55,56 ] in desalination of water as reverse osmosis (RO) membrane, [ 57 ] pervaporation process, [ 58,59 ] filtration/separation of metal ions, [ 60 ] and solid polymer electrolytes. [ 61–63 ]…”

Section: Introductionmentioning

confidence: 99%

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A review on carboxylic acid cross‐linked polyvinyl alcohol: Properties and applications

Gautam

Warkar

Ahmad

et al. 2021

Polymer Engineering & Sci

102

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Polyvinyl alcohol (PVA) is a nontoxic, biodegradable, and biocompatible polymer and has been used extensively in various fields. Indeed, important features of PVA such as its film-forming ability, high tensile strength and flexibility, high viscosity, solvent tolerance ability, thermostable nature have made it vital and drawn the attention of scientific community. However, being a watersoluble polymer, some chemical modifications are required to alter this property of PVA. Cross-linking is the most attractive and widely used method to change the properties of PVA to make it more valuable material. Different carboxylic acids have already been used for PVA cross-linking in various applications such as pervaporation, reverse osmosis (RO), wound dressing, drug delivery, and fuel cells. However, a comprehensive study on structure-property correlation of carboxylic acids as PVA cross-linker is not available. In this review, different available studies on carboxylic acid cross-linked PVA are summarized and are used to develop structure-property correlations of carboxylic acids as cross-linker on the properties of cross-linked PVA. Advantages and limitations of different carboxylic acids as PVA cross-linker are also summarized for various fields such as tissue engineering, wound dressing, drug delivery, fuel cell/ solid polymer electrolyte, pervaporation, desalination and RO solid polymer electrolytes, and food packaging.

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Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

A review on carboxylic acid cross‐linked polyvinyl alcohol: Properties and applications

Gautam

Warkar

Ahmad

et al. 2021

Polymer Engineering & Sci

102

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“…Available studies in the literature showed that PVA films lose their mechanical properties at temperatures well below 100 °C [27]. The combination we propose in this work, cross-linking with oxalic acid and the addition of clay as a reinforcing agent, plays a positive role in improving the mechanical properties of the composite and widening the temperature range of use [15]. A similar result consisting in the increase of the Young's modulus has been observed in Nafion films reinforced with up to 20% of montmorillonite clay [28].…”

Section: Dynamic Mechanical Analysismentioning

confidence: 73%

“…To avoid this problem, many approaches have been adopted to prepare composite polymers based on pure PVA and/or modified PVA. The modification of PVA is achieved by a cross-linking process involving the lateral hydroxyl group (OH) via an acid/base reaction by using a carboxylic di-acid such as the oxalic acid; this process is described in our earlier work [15].…”

Section: Introductionmentioning

confidence: 99%

Conductivity and dielectric relaxation of cross-linked PVA/montmorillonite electrolyte films

Mbarek

Fattoum

Sendi

et al. 2021

Ionics

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The objective of this work is to prepare and characterize polyvinyl alcohol/montmorillonite clay (PVA/MMT) composite films at various clay amounts. The PVA is cross-linked with oxalic acid at the cross-linking degree of 20%. The composite films are characterized by X-ray diffraction, water uptake and swelling measurements, Ac electrical conductivity and dielectric measurements, surface morphology study by scanning electron microscopy, thermal gravimetric analyses and dynamic mechanical analyses. X-ray diffraction study shows the presence of characteristic peaks of PVA with a decrease of the crystalline degree by addition of clay. The morphological study shows the presence of the montmorillonite phase in good dispersion in the PVA matrix. The water uptake and swelling behavior show a dependence on the clay percentage. The presence of clay enhances the thermal stability of the composite and increases the Young modulus and ductility of the films. The Ac conductivity between 100 Hz and 1 MHz shows response well fitted by the universal Jonsher law compatibly with charge transport in disordered materials. The DC conductivity shows an Arrhenius response with activation energy values compatible with ionic transport. The use of the dielectric permittivity and the modulus formalisms show the presence of two relaxation processes.

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“…The value of the activation energy for pure PVA is equal to the value reported by Hdidar et al 42 and corresponds to the activation energy of disordered polymer material. 59 As shown in the Figure 6 B, the activation energy is decreasing with the increase in the glycerol content. This could be explained by the increase of the amorphous phase and the softening of the polymer matrix (values summarized in Table 2).…”

Section: Dsc Analysismentioning

confidence: 76%

Structural, thermal and dielectric properties of glycerolized hydrogen‐bonded polyvinyl alcohol films

Gassab

Bréfuel

Sylvestre

et al. 2022

Polymers for Advanced Techs

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In order to evaluate the influence of plasticizers on the behavior of the dielectric properties of polymers intended for the elaboration of flexible sensors, we have studied the influence of the addition of glycerol (10 wt%–40 wt%) in polyvinyl alcohol (PVA). Once processed, the PVA films were not subjected to any particular annealing and they were dried at room temperature for 24 h before being characterized. This choice allows both to take advantage of the presence of water in the bulk of the material, which will help to make the PVA more flexible (increase of plasticization effect produced by extra‐H‐bonding) and avoid a transient behavior of water absorption into the material, as we could verify. DSC and FTIR investigations confirm good intermolecular interaction between vinyl polymer chains, glycerol, and water molecules. Dielectric spectroscopy analysis, carried out in [25°C–110°C] temperature and [0.1 Hz–1 MHz] frequency ranges, reveals a significant increase in the dielectric constant when the glycerol content is higher (at 0.1 Hz: 322 for pure PVA, 1.3 × 106 with 40 wt% of glycerol). Polar hydrogen bonds introduced by the glycerol are the main reason for this increase. Ionic conductivity induced by these dipoles dominates the loss tangent response of the material. The activation energy obtained from the DC conductivity plateau obeys to a conventional Arrhenius law with a decreasing value at highest glycerol contents (1.35 eV for pure PVA against 0.46 eV with 40 wt% of glycerol).

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Conductivity and dielectric relaxation in crosslinked PVA by oxalic and citric acids

Cited by 12 publications

References 23 publications

A review on carboxylic acid cross‐linked polyvinyl alcohol: Properties and applications

A review on carboxylic acid cross‐linked polyvinyl alcohol: Properties and applications

Conductivity and dielectric relaxation of cross-linked PVA/montmorillonite electrolyte films

Structural, thermal and dielectric properties of glycerolized hydrogen‐bonded polyvinyl alcohol films

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