Morphological evaluation and phase behavior of PVDF/PEO blends in the presence of graphene nanoplatelets through rheological measurements

Mohamadi, Mahboube; Papila, Melih; Garmabi, Hamid; Bajestani, Zahra Gohari

doi:10.1002/app.48017

Cited by 20 publications

(3 citation statements)

References 48 publications

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“…Patla et al [11] studied the influence of KBr salt and irradiation with 80 MeV O 7+ beam on the structural and mechanical properties of PEO/PVDF blend. Mohamadi et al [12] investigated the rheological properties of PEO/PVDF/graphene oxide (GO) nanocomposites for use in biosensors and smart scaffolds. Prabakaran et al [13] achieved photovoltaic performance (an open circuit voltage of 0.76 V, short circuit current 8.5 mA cm −2 and 4.6% solar conversion efficiency under 100 mW cm −2 illuminations) utilizing 0.8% wt% of GO loaded into PEO/PVDF/hexafluoropropylene ternary blend.…”

Section: Introductionmentioning

confidence: 99%

Controlling the structural, optical, and electrical properties of PVA/PEO blend by clay nanoparticles content

2021

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Synthesis of polymeric blends and nanocomposites of tuned properties gained increasing attention worldwide. In the present report, semicrystalline PVA/PEO blend films loaded with clay nanoparticles (Nps), at doping ratios in the range 3-12 wt%, were prepared and characterized by various techniques. XRD, SEM, and FTIR were used for probing the semicrystalline nature, morphology, and microstructure of the blend and complexation between its constituents. UV-vis-IR spectroscopy was performed to study the optical properties and optical constants of the prepared nanocomposites. Moreover, the dielectric properties were studied in the frequency range 0.1 Hz to 20 MHz and at different temperatures. Clay Nps incorporation decreased the blend crystallinity and affect its surface morphology without changing the blend structure. Strong interaction and complexation between the films' constituents are noted through the change in XRD peaks position and FTIR band intensity. The values of optical transmittance and absorption index of the films as well as the bandgap (E g ), refractive index (n), and optical dispersion parameters depend mainly on the clay Nps doped ratio. The direct E g decreased from 4.5 to 3.9 eV and n increased from 3.28 to 4.78. The dielectric constant, dielectric loss tangent, dielectric moduli (M′, M″), and ac conductivity were improved with the clay Nps content and also influenced by the temperature. The nature of the relaxation peaks in tan (δ) and M″ indicate the deviation of the conduction process from the ideal Debye type behavior. Increasing the semiconducting nature and the value of ac conductivity encourage the utilization of these nanocomposites in various electric and optoelectric applications.

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Section: Introductionmentioning

confidence: 99%

Controlling the structural, optical, and electrical properties of PVA/PEO blend by clay nanoparticles content

2021

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“…If dynamic processing is involved-for example, injection molding or the extrusion process-the fluidity of the gas-laden melt will also be affected. Therefore, as a useful way to evaluate the processability of the polymers employed, [14][15][16][17][18][19][20] the rheological measurement of the gas-laden melt is crucial to obtaining the corresponding processing information in the foaming operation. Corresponding to the different stages of the foaming process, different rheological measurements can be performed during the stages of gas diffusion, single-phase gas-melt flow, and gas separating/escaping from the melt.…”

Section: Introductionmentioning

confidence: 99%

Evaluating the gas-laden ability of polymer melt under atmospheric conditions using a modified torque rheometer

Mei

Zhou

Sun

et al. 2021

Journal of Cellular Plastics

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To investigate the effects of incorporating gas and the associated influencing factors on polymer melt, a method of evaluating the gas-laden ability using modified rheometric measurements was proposed. In this study, common and widely used thermoplastic materials—polypropylene (PP) and high-density polyethylene (HDPE), and their blends with different weight ratios—were selected, and the rheological properties of neat melt and gas-laden melts were tested using a modified torque rheometer. The foamed samples were also produced using a regular injection-molding machine, and the foamed morphology was examined by scanning electron microscope (SEM). The comparison of rheological curves of neat melt and gas-laden melt indicated that the incorporation of gas influenced the rheological properties of the gas-laden polymer melts as evidenced by a decrease of zero-rotational torque and an increase in the melt flow index. The results also suggested that the gas-laden ability of polymer melt could be evaluated quantitatively by the decay (due to desorption) of gas using the modified rheological measurement method. This study also demonstrated that the gas-laden ability can be used to predict the foaming behavior of polymer melts.

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“…Graphene nanoplatelets (GNPs) have exhibited large potentials, thanks to their excellent mechanical, thermal and electrical features as well as their capability of forming interconnected networks at relatively low contents. 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 ].…”

Section: Introductionmentioning

confidence: 99%

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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Morphological evaluation and phase behavior of PVDF/PEO blends in the presence of graphene nanoplatelets through rheological measurements

Cited by 20 publications

References 48 publications

Controlling the structural, optical, and electrical properties of PVA/PEO blend by clay nanoparticles content

Controlling the structural, optical, and electrical properties of PVA/PEO blend by clay nanoparticles content

Evaluating the gas-laden ability of polymer melt under atmospheric conditions using a modified torque rheometer

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

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