The Effect of PVP on Thermal, Mechanical, and Dielectric Properties in PVDF-HFP/PVP Thin Film

Centa, Urška Gradišar; Mihelčič, Mohor; Bobnar, V.; Remškar, Maja; Perše, Lidija Slemenik

doi:10.3390/coatings12091241

Cited by 20 publications

(10 citation statements)

References 43 publications

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“…This value is comparable with the X C measured for various PVDF‐HFP films recently reported in the literature. [ 43,49,51 ] The X C of the PVDF‐HFP films filled in Fe NPs up to 10 mg is lower than the X C found for the bare PVDF‐HFP film and the PVDF‐HFP film filled in 50 mg Fe NPs. This might be related to the fact that the nanoparticles in small amounts tend to form smaller agglomerations than the nanoparticles in high amounts which penetrate better the copolymer films.…”

Section: Resultsmentioning

confidence: 85%

Poly(Vinylidene Fluoride‐co‐Hexafluoropropylene) Films Filled in Iron Nanoparticles for Infrared Shielding Applications

Krajewski

Witowski

Liou

et al. 2023

Macromol. Rapid Commun.

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In order to use the infrared (IR) radiation shielding materials, they should take a form of thin film coatings deposited on glass/polymer substrates or be used as fillers of glass/polymer. The first approach usually suffers from several technological problems. Therefore, the second strategy gains more and more attention. Taking into account this trend, this work presents the usage of iron nanoparticles (Fe NPs) embedded into the poly(vinylidene fluoride-co-hexafluoropropylene) (PVDF-HFP) films as the shielding material in near-infrared (NIR) and mid-infrared (MIR) region. The performed investigations show that the transmittance of copolymer films decreases with increasing content of the Fe NPs inside them. It is found that the average fade of IR transmittance for 1, 2.5, 5, 10, and 50 mg of Fe NPs is about 13%, 24%, 31%, 77%, and 98%, respectively. Moreover, it is observed that the PVDF-HFP films filled in the Fe NPs almost does not reflect the NIR and MIR radiation. Hence, the IR shielding properties of the PVDF-HFP films can be effectively tuned by the addition of proper amount of the Fe NPs. This, in turn, shows that the PVDF-HFP films filled in the Fe NPs constitute a great option for IR antireflective and shielding applications.

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Section: Resultsmentioning

confidence: 85%

Poly(Vinylidene Fluoride‐co‐Hexafluoropropylene) Films Filled in Iron Nanoparticles for Infrared Shielding Applications

Krajewski

Witowski

Liou

et al. 2023

Macromol. Rapid Commun.

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“…The degree of crystallinity based eq 3 is usually used for semicrystalline polymers where there is a clear distinction between the crystalline and amorphous regions . Crystallized polymers simply consist of aligned polymer chains, forming lamellae. , According to previous studies, eq 3 was only used to determine the degree of crystallinity of poly(vinylidene fluoride) (PVDF) although it did consist of many other materials. , In other previous studies, eq 3 has been used to calculate the degree of crystallinity of several composite polymers, i.e., poly(vinylidene fluoride- co -hexafluoropropylene) (PVDF-HFP), poly(ethylene oxide)/poly(vinyl pyrrolidone) (PEO/PVP-TiO 2 ), polyvinyl alcohol (PVA), , polyethylene-oxide/poly( l -lactide) (PEO/PLLA), and polyetheretherketone (PEEK) . Additionally, the previous research also showed that the degree of crystallinity in DSC was only analyzed for the effect of the polymer (PVA), while the degree of crystallinity of the red betel extract was calculated on the XRD section .…”

Section: Resultsmentioning

confidence: 99%

Physicochemical Characteristics and Antibacterial Activities of Freeze-Thawed Polyvinyl Alcohol/Andrographolide Hydrogels

et al. 2023

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Andrographolide (AG) is one of the compounds in Andrographis paniculata, which has a high antibacterial activity. This paper reports the freeze–thaw method’s use to synthesize polyvinyl alcohol (PVA) hydrogels loaded with AG and its characterization. From the morphological examination, the porosity of the PVA/AG hydrogel was found to increase with the increasing AG concentration. The swelling degree test revealed that the hydrogels’ maximum swelling degrees were generally greater than 100%. The composite hydrogel with the highest fraction of andrographolide (PAG-4) showed greater weight loss than the hydrogel without AG (PAG-0). The molecular interaction between PVA and AG resulted in the narrowing of the band attributed to the O–H and CO stretching bonds and the emergence of an amorphous domain in the composite hydrogels. The loading of AG disrupted the formation of hydroxyl groups in PVA and interrupted the cross-linking between PVA chains, which lead to the decrease of the compression strength and the crystallinity increased with increasing AG. The antibacterial activity of the composite hydrogel increased with increasing AG. The PAG-4 hydrogel had the highest antibacterial activity of 37.9 ± 4.6b %. Therefore, the PVA/AG hydrogel has the potential to be used as an antibacterial device.

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“…Depending on the molecular weight and structure (i.e., the arrangement of the pendant groups, pyrrolidone, and amide groups), it was reported that the T g of PVP and PAM could vary from 54 C to 175 C and 100 C to 184 C, respectively, 44,45 and our work is consistent with these reports. For example, Jia et al 46 and Centa et al 47 reported a glass transition temperature of 61.8 C and 164.8 C for PVP polymers respectively. The optimized blended films also exhibited a T g of 83.63 C, lower than the T g of the parental polymers.…”

Section: Thermal Characteristicsmentioning

confidence: 99%

Optimization of the glass transition temperature of polyvinyl pyrrolidone/polyacrylamide blend films using response surface methodology

Yazie

Worku

Gabbiye

et al. 2023

J of Applied Polymer Sci

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In this study, we aimed at synthesizing polymeric materials consisting of polyvinyl pyrrolidone (PVP) enhanced polyacrylamide (PAM) blend films and optimizing the glass transition temperature (Tg) of the synthesized polymeric blends. The PAM and PVP polymers were blended through solution casting techniques by varying PAM (0.3–1.2 g) and PVP (0.3–1 g) concentrations in parallel. The response surface methodology (RSM) experimental design, a mathematical and statistical method, was used to design the experiments, model the process, and determine the optimum concentrations of the blended films having the lowest Tg value. The polymeric blends were characterized using differential scanning calorimetry (DSC) to investigate their phase transition temperatures such as their Tg. Moreover, the polymeric blends with the lowest Tg values were characterized using Fourier transform infrared spectroscopy (FTIR), Thermogravimetric analyzer (TGA), and UV–Vis spectroscopy to investigate the interactions existing between the parental polymers, the thermal stability, and the optical properties such as energy band gap of the parental polymers and optimized blended films respectively. It was found that Tg of the blended films was strongly dependent on the concentrations of the parental polymers, and PAM polymer exhibited a more pronounced effect on the Tg of the blended films. The Tg of the synthesized films declined when the parental polymers were blended at higher concentrations. The energy band gap and the thermal stability of the optimized blended films were lower than that of the parental polymers (i.e., 4.90 eV and 210°C). The DTG curve of the optimized blended films exhibited a maximum weight loss at 467°C. The RSM statistical analysis revealed a high regression coefficient (R2) of 0.970 for the Tg of the blended films, showing the experimental values analyzed are in good agreement with the developed model. Numerical optimization results showed that an optimum concentration of the blended films yielded the lowest Tg value of 83.63°C, which is close to the predicted Tg of 82.32°C, was achieved with 1.2 g of PAM and 1 g of PVP. The higher Tg value of the optimized blended films indicates that the polymer blends formed are highly brittle at room temperature when available in a dry state.

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The Effect of PVP on Thermal, Mechanical, and Dielectric Properties in PVDF-HFP/PVP Thin Film

Cited by 20 publications

References 43 publications

Poly(Vinylidene Fluoride‐co‐Hexafluoropropylene) Films Filled in Iron Nanoparticles for Infrared Shielding Applications

Poly(Vinylidene Fluoride‐co‐Hexafluoropropylene) Films Filled in Iron Nanoparticles for Infrared Shielding Applications

Physicochemical Characteristics and Antibacterial Activities of Freeze-Thawed Polyvinyl Alcohol/Andrographolide Hydrogels

Optimization of the glass transition temperature of polyvinyl pyrrolidone/polyacrylamide blend films using response surface methodology

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