Thermally stimulated dielectric properties of polyvinylidenefluoride–zinc oxide nanocomposites

Gaur, M. S.; Indolia, Ajay Pal

doi:10.1007/s10973-010-1190-1

Cited by 33 publications

(9 citation statements)

References 20 publications

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“…The strong reflection peak at 15 of 2u across the nanocomposite films, corresponding to the a-crystal phase, [33] was however found to be altered progressively as a function of the ZnO loading within the samples (Figure 1). The intensity of this peak increased and reached a maximum for ZnO contents between 5 and 10 vol%, suggesting that the inclusion of the ZnO NPs favored the formation of the acrystal phase [34] at these contents. This a-crystal phase, although less crystalline than the b-< /boldcrystal phase due to a lower inter-chain packing density, is considered as the most chemically stable geometry.…”

Section: Micro-structural Organization Of Zinc Oxide (Zno)mentioning

confidence: 97%

Zinc Oxide PVDF Nano‐Composites–Tuning Interfaces toward Enhanced Mechanical Properties and UV Protection

et al. 2016

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This work shows that the mechanical properties and UV-resistance of poly(vinylidene fluoride) (PVDF) materials can be significantly improved upon dispersion of zinc oxide (ZnO) nano-particles. Zinc Oxide PVDF Nano-Composites are first produced through melt-compounding and are subsequently converted into thin films or into injection molded samples. The dispersion of the ZnO into PVDF is found to be relatively homogeneous throughout all samples. The inclusion of the ZnO is found to largely improve the tensile and flexural modulus by up to 20 and 60%, respectively. At ZnO contents exceeding 15 vol%, the UV transmittance of the films is completely obstructed, demonstrating the UV-shielding action of the nanoparticles. The collective results strongly suggest that these nano-composites could find potential applications where improved strength and both visible and UV-resistance are needed.

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Section: Micro-structural Organization Of Zinc Oxide (Zno)mentioning

confidence: 97%

Zinc Oxide PVDF Nano‐Composites–Tuning Interfaces toward Enhanced Mechanical Properties and UV Protection

et al. 2016

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“…Commonly used nanoparticles include titanium dioxide (anatase TiO 2 ), zinc oxide (ZnO), aluminum oxide (Al 2 O 3 ), magnetite (Fe 3 O 4 ), graphite oxide (GO), multiwalled carbon nanotubes (MWCNTs), and polymeric nanoparticles . Polymeric nanoparticles, including nanospheres and nanocapsules, are formed by a polymeric matrix and mainly used for drug delivery, where the molecules are absorbed in or on the matrix, for example, encapsulation of insulin in poly(lactic‐ co ‐glycolic acid) nanoparticles .…”

Section: Introductionmentioning

confidence: 99%

Visible Light Photocatalytic Functional TiO₂/PVDF Nanofibers for Dye Pollutant Degradation

Lou

Wang

Lee

et al. 2019

Part & Part Syst Charact

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contaminated water becomes an environmental hazard.Functional photocatalytic nanofiber webs [6,7] are promising environmentally friendly candidates for the photodegradation of organic pollutants, such as dyes and pigments. Nanofibers have high specific morphology, [8] small diameter [9] and small pore size, [10] and customizable physicochemical characteristics, [11] which make them excellent candidates in wastewater treatment, [12] biomedical applications, [13][14][15] protein purification, [16] and air filtration. [17] Poly(vinylidene fluoride) (PVDF) [18] is a commonly used hydrophobic polymer for wastewater treatment, due to its excellent thermal stability, mechanical stability, chemical resistance, and selective permeability. However, interception effect (meaning large particles would be intercepted by small pore size nanofiber webs), the major ultrafiltration mechanism for unfunctionalized PVDF nanofiber webs, [19] limits their applications because of their low filtration efficiency and poor functionality. The addition of nanoparticles could improve the photocatalytic properties, [20] mechanical properties, [21] hydrophobicity, [22,23] and other functional performances of nanofiber webs. [19][20][21][22][23] Moreover, physical modification methods (addition of functional nanoparticles) have proved to be simpler and more effective than chemical modification methods. [24] Commonly used nanoparticles include titanium dioxide (anatase TiO 2 ), [25] zinc oxide (ZnO), [26] aluminum oxide (Al 2 O 3 ), [27] magnetite (Fe 3 O 4 ), [28] graphite oxide (GO), [29] multiwalled carbon nanotubes (MWCNTs), [30] and polymeric nanoparticles. [31] Polymeric nanoparticles, including nanospheres and nanocapsules, are formed by a polymeric matrix and mainly used for drug delivery, where the molecules are absorbed in or on the matrix, for example, encapsulation of insulin in poly(lactic-co-glycolic acid) nanoparticles. [32] Among these nanoparticles, anatase titanium dioxide is the most widely used catalyst for water treatment because of low cost, stability in water, and high photocatalytic property. [19][20][21] The addition of TiO 2 in nanofiber webs can greatly improve the degradation rate of organic pigments/dyes pollutants, [19] antibacterial properties, [20] and other performances (antifouling property, wettability). [20,21,23] Electrospinning is a popular and simple method to produce functional nanofiber webs among all existing nanofiber webs technologies, such as melt spinning, solution spinning, andThe photodegradation of poly(vinylidene fluoride) (PVDF)/titanium oxide (TiO 2 ) nanofibers under visible light is described, something that has not been previously reported in the literature. Visible light photocatalytic electrospun PVDF/TiO 2 nanofiber webs with anatase TiO 2 concentration varying from 0% to 20% (0%, 1%, 3%, 5%, 10%, and 20%) are produced, and their ability to degrade a toxic pollutant, Rhodamine B (RhB), is studied. Photodegradation study using UV-vis spectroscopy on PVDF/TiO 2 nanofiber webs (with TiO 2 con...

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“…The effect of adding varying concentrations of the Al 2 O 3 on the structural properties of sPS was explored using XRD . Although numerous studies have been conducted on the thermal behavior of polymeric materials as a function of nano‐sized fillers , none have focused on sPS embedded with Al 2 O 3 nanoparticles. This on‐going study aims to dealing exclusively with the gel content and thermal characterization of highly dispersed polymer‐based nanocomposites comprising sPS host and Al 2 O 3 nanoparticles.…”

Section: Introductionmentioning

confidence: 99%

Investigation of the effect of aluminum oxide nanoparticle additives and gamma irradiation on the thermal behavior of syndiotactic polystyrene

Abdeldaym

Elhady

2019

Polymer Composites

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Syndiotactic polystyrene (sPS) containing 3, 5, 7, and 10 wt % of aluminum oxide (Al 2 O 3 ) nanoparticles were prepared following the melt-mixing technique. The thermal behavior of the sPS/Al 2 O 3 nanocomposites was investigated through differential scanning calorimetry (DSC), thermogravimetric analysis (TGA) and melt flow index (MFI). The DSC results indicated that for all sPS/Al 2 O 3 nanocomposites, the melting temperature (T m ), the melting enthalpy (ΔH m ), the crystallization temperature (T c ), and the glass transition temperature (T g ) increased with an increase in the Al 2 O 3 nanoparticles content. The TGA analysis indicated that the thermal stability of all nanocomposites is significantly enhanced after the addition of Al 2 O 3 nanoparticles with different contents. The activation energy was determined through two different models: the Coats-Redfern model and Broido's models were utilized to measure the activation energy of thermal decomposition by assuming first-order kinetics. The results of both methods have displayed a high level of agreement. Our study extended to study the MFI of the sPS/Al 2 O 3 nanocomposites. The MFI reduced when the Al 2 O 3 nanoparticles content increased. The effect of gamma irradiation on the thermal behavior of the sPS/Al 2 O 3 nanoparticles was also investigated at different gammaabsorbed doses. Significant modifications were observed in the thermal behavior of sPS/Al 2 O 3 nanocomposites after the irradiation process, and the experimental data indicated that the addition of Al 2 O 3 nanocomposites in small loading contents and gamma irradiation can significantly help improve the thermal properties of sPS. POLYM. COMPOS., 40:3588-3600, 2019.FIG. 3. (a) The changes in melting temperature (tm) and (b) the changes in melting enthalpy (Hm) as a function of Al 2 O 3 nanoparticles content for the pure sPS and sPS/Al 2 O 3 nanocomposites before and after gamma irradiation. FIG. 7. Some plots of the Coats-Redfern method of thermal decomposition for (a) pure sPS, (b) sPS/3%Al 2 O 3 nanocomposite, and (c) sPS/5% Al 2 O 3 nanocomposite.

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Thermally stimulated dielectric properties of polyvinylidenefluoride–zinc oxide nanocomposites

Cited by 33 publications

References 20 publications

Zinc Oxide PVDF Nano‐Composites–Tuning Interfaces toward Enhanced Mechanical Properties and UV Protection

Zinc Oxide PVDF Nano‐Composites–Tuning Interfaces toward Enhanced Mechanical Properties and UV Protection

Visible Light Photocatalytic Functional TiO₂/PVDF Nanofibers for Dye Pollutant Degradation

Investigation of the effect of aluminum oxide nanoparticle additives and gamma irradiation on the thermal behavior of syndiotactic polystyrene

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Thermally stimulated dielectric properties of polyvinylidenefluoride–zinc oxide nanocomposites

Cited by 33 publications

References 20 publications

Zinc Oxide PVDF Nano‐Composites–Tuning Interfaces toward Enhanced Mechanical Properties and UV Protection

Zinc Oxide PVDF Nano‐Composites–Tuning Interfaces toward Enhanced Mechanical Properties and UV Protection

Visible Light Photocatalytic Functional TiO2/PVDF Nanofibers for Dye Pollutant Degradation

Investigation of the effect of aluminum oxide nanoparticle additives and gamma irradiation on the thermal behavior of syndiotactic polystyrene

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Visible Light Photocatalytic Functional TiO₂/PVDF Nanofibers for Dye Pollutant Degradation