Spectroscopic analysis of CdCl<sub>2</sub> doped PVA–PVP blend films

Baraker, Basavarajeshwari M.; Lobo, Blaise

doi:10.1139/cjp-2016-0848

Cited by 32 publications

(9 citation statements)

References 43 publications

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“…However, a strong absorption peak appears at the wavelength from 240 to 290 nm, which belongs to C-H bend peak of a vibrational structure. It is due to the dipole-dipole interaction between molecules [66], or n → π * transition, because of unsaturated (C=O) bond break, as reported earlier [67]. Compared with the pure PVA films and PVA/CQDs films, the transmittance of PVA/CNF films and PVA/CNF/CQDs films decreases with the addition of CNF (8 wt.%) into PVA-based film, showing that barrier property to light of PVA/CNF film improved by the introduction of CNF.…”

Section: Barrier Property To Light Of the Prepared Pva-based Filmssupporting

confidence: 62%

Preparation and Performance of Radiata-Pine-Derived Polyvinyl Alcohol/Carbon Quantum Dots Fluorescent Films

Zhang

Pan

et al. 2019

Materials

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In this study, the low-cost processing residue of Radiata pine (Pinus radiata D. Don) was used as the lone carbon source for synthesis of CQDs (Carbon quantum dots) with a QY (The quantum yield of the CQDs) of 1.60%. The CQDs were obtained by the hydrothermal method, and +a PVA-based biofilm was prepared by the fluidized drying method. The effects of CQDs and CNF (cellulose nanofibers) content on the morphology, optical, mechanical, water-resistance, and wettability properties of the PVA/CQDs and PVA/CNF/CQDs films are discussed. The results revealed that, when the excitation wavelength was increased from 340 to 390 nm, the emission peak became slightly red-shifted, which was induced by the condensation between CQDs and PVA. The PVA composite films showed an increase in fluorescence intensity with the addition of the CNF and CQDs to polymers. The chemical structure of prepared films was determined by the FTIR spectroscopy, and no new chemical bonds were formed. In addition, the UV transmittance was inversely proportional to the change of CQDs content, which indicated that CQDs improved the UV barrier properties of the films. Furthermore, embedding CQDs Nano-materials and CNF into the PVA matrix improved the mechanical behavior of the Nano-composite. Tensile modulus and strength at break increased significantly with increasing the concentration of CQDs Nano-materials inside the Nano-composite, which was due to the increased in the density of crosslinking behavior. With the increase of CQDs content (>1 mL), the water absorption and surface contact angle of the prepared films decreased gradually, and the water-resistance and surface wettability of the films were improved. Therefore, PVA/CNF/CQDs bio-nanocomposite films could be used to prepare anti-counterfeiting, high-transparency, and ultraviolet-resistant composites, which have potential applications in ecological packaging materials. IntroductionPolyvinyl alcohol (PVA) is a kind of semi-crystalline polymer with a linear structure and strong hydrogen bonds intermolecular. It has been widely used in papermaking [1], textiles [2], coatings [3], adhesives [4], packaging [5], and biomedicine [6] because of its toughness [7], adhesiveness [8], biocompatibility [9], swelling behavior [10], lack of toxicity [11], and sufficient thermal stability; it is also odorless and tasteless. However, PVA is highly hydrophilic and water-soluble [12], and its light transmittance is not suitable for light-barrier packaging [13]. In order to expand the application of PVA, much attention has been paid to fabricating functional PVA composites. The existence of hydrogen-bonding groups in PVA structure and the ability to form hydrogen bonds makes PVA suitable for mixing with other materials to improve its functional properties [14,15]. In previous studies, the prepared silica in situ enhanced PVA/chitosan biodegradation films [16], PVA/tea polyphenol composite films [17], PVA reinforced with cellulose nanocrystals or cellulose nanofibers (CNF) [18], and CNF/PVA-borax hybrid foams [19] had...

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Section: Barrier Property To Light Of the Prepared Pva-based Filmssupporting

confidence: 62%

Preparation and Performance of Radiata-Pine-Derived Polyvinyl Alcohol/Carbon Quantum Dots Fluorescent Films

Zhang

Pan

et al. 2019

Materials

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“…Lee et al [78] demonstrated that the reduction in transmittance percentage is an advantage for food packaging application. However, a strong absorption peak arrived in the wavelength range of 240 to 310 nm, which could be attributed to dipole-dipole interaction between molecules or n → π * transition, because of unsaturated C=O bond break as reported earlier [79,80]. The transparency and opacity of all the prepared films were calculated and shown in Fig.…”

Section: The Effect Of 7h4mc On Optical Properties Of Pva/omssupporting

confidence: 58%

Mechanical, optical and antioxidant properties of 7-Hydroxy-4-methyl coumarin doped polyvinyl alcohol/oxidized maize starch blend films

et al. 2020

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In the present study, the different weight ratios of 7-hydroxy-4-methyl coumarin (7H4MC) mixed polyvinyl alcohol (PVA)/ oxidized maize starch (OMS) blend films were achieved by the solvent casting method and coded as PSC. The prepared film samples were characterized by employing techniques such as FTIR, UTM, and SEM. The film samples were also subjected to their wettability, biodegradation and migration rate studies. Experimental outcomes showed that strong intermolecular hydrogen bonding between components of the blend films contribute to increase the mechanical properties, smoother surface morphology, increase in surface hydrophobicity, improvement in biodegradability, and exhibited migration rates below the overall migration limit (OML). Furthermore, moisture content, density, optical properties, water absorption, water solubility, water vapour transmission rate and antioxidant properties are discussed in detail. With all these properties, PVA/OMS/7H4MC blend films have the potential to use as packaging material.

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“…Formation of charge transfer complexes modifies the band structure of the PVA-PVP blend, on adding CdCl 2 [55]. For 10.2 wt% of CdCl 2 in the PVA/PVAc-PVP blend, the sample is amorphous in nature, but contains micro-globules of dopant encapsulated by polymer molecules [56]. In the amorphous region, polymer chains are flexible and mobile, and hence, the dipoles can orient themselves easily with the applied field at low frequency.…”

Section: 2c Tangent Lossmentioning

confidence: 99%

Dielectric relaxation in a cadmium chloride-doped polymeric blend

Baraker

Lobo

2019

Bull Mater Sci

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The temperature-and frequency-dependent relaxation processes in films of a polymeric blend comprising a polyvinyl alcohol (PVA)/polyvinyl acetate (PVAc) co-polymer blended with polyvinyl pyrrolidone (PVP) in equal proportion by weight, and doped with an inorganic metallic salt, cadmium chloride (CdCl 2), at 0.0 wt% and 10.2 wt% doping levels (DLs), have been studied using dielectric relaxation spectroscopy (DRS). The frequency response of dielectric parameters for these samples has been studied with variation in temperature, from 303 up to 373 K, at different fixed frequencies (from 12 Hz up to 200 kHz). Study of Cole-Cole plots reveals a decrease in bulk resistivity of the samples with increase in temperature, which is attributed to thermally induced increase in the mobility of polymer chains. A 10-fold increase in bulk conductivity is observed for doped films with a DL of 10.2 wt%, when compared with the bulk conductivity of the un-doped (0.0 wt% DL) sample. The temperature dependence of dielectric parameters at different frequencies has been studied and the activation energy has been calculated. The relaxation time is found to be of the order of a few milliseconds, which implies that electrical conduction in CdCl 2-doped PVA/PVAc-PVP blend films is predominantly due to the migration of ions. The variation of AC conductivity with frequency is in agreement with Jonscher's universal power law. AC conductivity of the sample is found to increase significantly with an increase in temperature of the sample. Frequency-dependent dielectric properties of CdCl 2-doped PVA/PVAc-PVP blend films, for various DLs, are also studied at room temperature.

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Spectroscopic analysis of CdCl₂ doped PVA–PVP blend films

Cited by 32 publications

References 43 publications

Preparation and Performance of Radiata-Pine-Derived Polyvinyl Alcohol/Carbon Quantum Dots Fluorescent Films

Preparation and Performance of Radiata-Pine-Derived Polyvinyl Alcohol/Carbon Quantum Dots Fluorescent Films

Mechanical, optical and antioxidant properties of 7-Hydroxy-4-methyl coumarin doped polyvinyl alcohol/oxidized maize starch blend films

Dielectric relaxation in a cadmium chloride-doped polymeric blend

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Spectroscopic analysis of CdCl2 doped PVA–PVP blend films

Cited by 32 publications

References 43 publications

Preparation and Performance of Radiata-Pine-Derived Polyvinyl Alcohol/Carbon Quantum Dots Fluorescent Films

Preparation and Performance of Radiata-Pine-Derived Polyvinyl Alcohol/Carbon Quantum Dots Fluorescent Films

Mechanical, optical and antioxidant properties of 7-Hydroxy-4-methyl coumarin doped polyvinyl alcohol/oxidized maize starch blend films

Dielectric relaxation in a cadmium chloride-doped polymeric blend

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Spectroscopic analysis of CdCl₂ doped PVA–PVP blend films