Effect of polyethylene glycol-grafted graphene on the non-isothermal crystallization kinetics of poly(ethylene oxide) and poly(ethylene oxide):lithium perchlorate electrolyte systems

Gomari, Sepideh; Ghasemi, Ismaeil; Esfandeh, Masoud

doi:10.1016/j.materresbull.2016.05.021

Cited by 19 publications

(13 citation statements)

References 53 publications

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“…The hydrogen bond interactions of unreacted carboxyl groups in PMA component were responsible for the acceleration of the crystallization process of MPEG moieties and the increased melting point of MPEG moieties. However, when the carboxyl groups of PMA-MPEG 1.4 coordinated with Eu 3+ ions, both the melting and crystallization behaviors of the MPEG component were destroyed, implying that the formation of Eu-PMA structure completely restricted the crystallization process of MPEG moieties to produce an amorphous state, which was consistent with previously reported results that the addition of nanoparticles caused a further reduction in the crystallinity of PEG [ 38 ]. It was also found that the Eu/Tb-PMA-MPEG sample was the same as Eu-PMA-MPEG, displaying a transparent and viscous fluid state at room temperature due to the amorphous structure of the MPEG component.…”

Section: Resultssupporting

confidence: 90%

Biomineralized Nano-Assemblies of Poly(Ethylene Glycol) Derivative with Lanthanide Ions as Ratiometric Fluorescence Sensors for Detection of Water and Fe3+ Ions

Chen

Zhao

2022

Polymers

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An effective strategy was developed to fabricate novel lanthanide ions–pyromellitic acid–methoxy poly(ethylene glycol) (Ln-PMA-MPEG) nano-assemblies. The amphiphilic partially esterified derivative (PMA-MPEG) of pyromellitic acid with methoxy poly(ethylene glycol) was designed and synthesized via the coupling reaction. Ln-PMA-MPEG nano-assemblies were rapidly fabricated using PMA-MPEG as a polymer ligand with Eu3+ ions or mixed Eu3+/Tb3+ ions through biomimetic mineralization in neutral aqueous systems. The size of the as-prepared materials could be designed in the range 80–160 nm with a uniform distribution. The materials were readily dispersed in various solvents and displayed visible color variations and different photoluminescent properties for solvent recognition. The mixed Eu/Tb-PMA-MPEG nanomaterials were investigated as ratiometric sensors for the detection of trace water in DMF and Fe3+ ions in aqueous solutions. The sensor materials can quantitatively detect trace water in DMF from 0% to 10% (v/v). The resultant materials also display a strong correlation between the double luminescence intensity ratios (ITb/IEu) and Fe3+ concentration, with a good linear detection concentration in the range of 0–0.24 mM and a limit of detection of 0.46 μM, and other metal ions did not interfere with the sensing mechanism for Fe3+ ions. The novel nano-assemblies have potential applications as ratiometric fluorescent nanosensors in the chemical industry as well as in biomedical fields.

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Section: Resultssupporting

confidence: 90%

Biomineralized Nano-Assemblies of Poly(Ethylene Glycol) Derivative with Lanthanide Ions as Ratiometric Fluorescence Sensors for Detection of Water and Fe3+ Ions

Chen

Zhao

2022

Polymers

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“…As expected, the second-stage weight loss (~11% at 355 °C) of the FGNP occurred at higher temperatures because of the thermal resistance of the PEG chains [ 44 ]. Similar results were reported by our group [ 21 ] (see the Supporting Material for details on quantitative determination of the GNP functionalization reaction by EDX and CHNO elemental analysis ( Table S1 )).…”

Section: Resultssupporting

confidence: 88%

“…As can be seen on the derivative spectra of GNP-COOH and FGNP, appearing at some temperatures below 100 • C, the first peak corresponded to the release of moisture; the second one could be attributed to the pyrolysis of the liable oxygen-bearing functional groups, resulting in some 5% weight loss at 245 • C. As expected, the second-stage weight loss (~11% at 355 • C) of the FGNP occurred at higher temperatures because of the thermal resistance of the PEG chains [44]. Similar results were reported by our group [21] (see the Supporting Material for details on quantitative determination of the GNP functionalization reaction by EDX and CHNO elemental analysis (Table S1)). 3a).…”

Section: Differential Scanning Calorimetrysupporting

confidence: 88%

“…Such improvements in characteristics at such low contents have been assigned to the high aspect ratio of the GNPs [ 19 ]. Yet, fine dispersion and distribution of carbonaceous NPs in the polymer matrix have remained unsolved issues [ 20 , 21 ]. Homogeneous dispersion of carbonaceous NPs in the polymer can be enhanced by chemical or physical functionalization [ 22 , 23 ].…”

Section: Introductionmentioning

confidence: 99%

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Microstructural Development and Rheological Study of a Nanocomposite Gel Polymer Electrolyte Based on Functionalized Graphene for Dye-Sensitized Solar Cells

et al. 2020

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For a liquid electrolyte-based dye-sensitized solar cell (DSSC), long-term device instability is known to negatively affect the ionic conductivity and cell performance. These issues can be resolved by using the so called quasi-solid-state electrolytes. Despite the enhanced ionic conductivity of graphene nanoplatelets (GNPs), their inherent tendency toward aggregation has limited their application in quasi-solid-state electrolytes. In the present study, the GNPs were chemically modified by polyethylene glycol (PEG) through amidation reaction to obtain a dispersible nanostructure in a poly(vinylidene fluoride-co-hexafluoro propylene) copolymer and polyethylene oxide (PVDF–HFP/PEO) polymer-blended gel electrolyte. Maximum ionic conductivity (4.11 × 10−3 S cm−1) was obtained with the optimal nanocomposite gel polymer electrolyte (GPE) containing 0.75 wt% functionalized graphene nanoplatelets (FGNPs), corresponding to a power conversion efficiency of 5.45%, which was 1.42% and 0.67% higher than those of the nanoparticle-free and optimized-GPE (containing 1 wt% GNP) DSSCs, respectively. Incorporating an optimum dosage of FGNP, a homogenous particle network was fabricated that could effectively mobilize the redox-active species in the amorphous region of the matrix. Surface morphology assessments were further performed through scanning electron microscopy (SEM). The results of rheological measurements revealed the plasticizing effect of the ionic liquid (IL), offering a proper insight into the polymer–particle interactions within the polymeric nanocomposite. Based on differential scanning calorimetry (DSC) investigations, the decrease in the glass transition temperature (and the resultant increase in flexibility) highlighted the influence of IL and polymer–nanoparticle interactions. The obtained results shed light on the effectiveness of the FGNPs for the DSSCs.

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“…Graphene nanoplatelets were chemically functionalized according to the procedure described in our previous work [31]. Initially, carboxylic acid groups were introduced onto the GnP nanosheets, to prepare GnP-COOH, via mixing with a 1:…”

Section: Functionalization Of Graphene Nanoplateletsmentioning

confidence: 99%

All-solid-state flexible nanocomposite polymer electrolytes based on poly(ethylene oxide): Lithium perchlorate using functionalized graphene

2017

Self Cite

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Solid polymer electrolytes (SPEs) rapidly attracted a great attention as a potential material to be used in flexible rechargeable lithium ion batteries, if an optimal match between their ionic conductivity and mechanical stability was achieved. In this work, two types of nanocomposite SPE based on poly(ethylene) oxide (PEO) and lithium perchlorate salt (LiClO 4) containing pristine graphene (GnP) or polyethylene glycol-grafted graphene (FGnP) were prepared. Differential scanning calorimetry (DSC) and X-ray diffraction (XRD) results revealed a reduced degree of crystallinity for nanocomposite electrolytes. The increment in amorphous phase domains was also confirmed by polarized optical microscope (POM), particularly for SPE/FGnP nanocomposites. Ionic conductivity showed one order of magnitude enhancement for SPE/FGnP(0.5%) at room temperature, while mechanical stability was also improved reasonably. Polyethylene glycol grafted onto FGnP appears to play two roles: plasticizing effect to promote the segmental motion of PEO chains, and contributing in dissociation of lithium salt.

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Effect of polyethylene glycol-grafted graphene on the non-isothermal crystallization kinetics of poly(ethylene oxide) and poly(ethylene oxide):lithium perchlorate electrolyte systems

Cited by 19 publications

References 53 publications

Biomineralized Nano-Assemblies of Poly(Ethylene Glycol) Derivative with Lanthanide Ions as Ratiometric Fluorescence Sensors for Detection of Water and Fe3+ Ions

Biomineralized Nano-Assemblies of Poly(Ethylene Glycol) Derivative with Lanthanide Ions as Ratiometric Fluorescence Sensors for Detection of Water and Fe3+ Ions

Microstructural Development and Rheological Study of a Nanocomposite Gel Polymer Electrolyte Based on Functionalized Graphene for Dye-Sensitized Solar Cells

All-solid-state flexible nanocomposite polymer electrolytes based on poly(ethylene oxide): Lithium perchlorate using functionalized graphene

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