Dispersion parameters of cadmium chloride doped PVA-PVP blend films

Baraker, Basavarajeshwari M.; Lobo, Blaise

doi:10.1007/s10965-017-1242-3

Cited by 35 publications

(9 citation statements)

References 36 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…PVA/PVP (1:1) blends showed good charge storage capacity and good sensitivity for dopant additions . Several researchers studied the properties of PVA/PVP blends doped with azo dyes, inorganic salts, and nano‐particles . A 4:1 blend of PVA/PVP doped with semiconducting silver sulfide particles produced a small band‐gap composite…”

Section: Introductionmentioning

confidence: 99%

Super‐tough biodegradable poly(vinyl alcohol)/poly(vinyl pyrrolidone) blends plasticized by glycerol and sorbitol

Boonsuk

Kaewtatip

Chantarak

et al. 2018

J of Applied Polymer Sci

View full text Add to dashboard Cite

Tough biodegradable films were prepared using a poly(vinyl alcohol) (PVA)/poly(vinyl pyrrolidone) (PVP) (1:1) blend with plasticizers of glycerol (GLY), sorbitol (SOR), and their (one to one) mixture. We studied the effect of plasticization on the structural, thermal, and mechanical properties of the PVA/PVP blend films. Fourier transform infrared spectra indicated good miscibility of the two components due to the H-bonding between the PVA and PVP molecules. The addition of plasticizers reduced the interaction between PVA and PVP, evidenced by an increase in the intensity of PVA diffraction peaks observed in the X-ray diffraction (XRD) characterization. Thermal degradation of the blends increased as a function of the plasticizer used. GLY affected thermal degradation more than SOR and the mixtures. The incorporation of the plasticizers promoted the growth of PVA crystals as evidenced by XRD patterns and the enthalpy of fusion (DH f ) obtained by differential scanning calorimetry measurements. The introduction of SOR to the binary blend increased toughness seven times and imparted simultaneous and pronounced improvements to maximum tensile stress and elongation at break. This behavior holds out great promise for the development of a new generation of mechanically robust, yet thoroughly biodegradable materials that could effectively supplant conventional polymers in demanding applications. V C 2018 Wiley Periodicals, Inc. J. Appl. Polym. Sci. 2018, 135, 46406.

show abstract

Section: Introductionmentioning

confidence: 99%

Super‐tough biodegradable poly(vinyl alcohol)/poly(vinyl pyrrolidone) blends plasticized by glycerol and sorbitol

Boonsuk

Kaewtatip

Chantarak

et al. 2018

J of Applied Polymer Sci

View full text Add to dashboard Cite

show abstract

“…This decrease in the value of bulk conductivity with an increase in dopant concentration is due to reduction in the concentration of available ions for conduction or transportation. This is due to interaction between the dopant (CdCl 2 ) and the polymer molecules (PVA/PVAc-PVP), there is a reduction of Cd 2+ ions into Cd atoms; because of this, there are selfgrown nano-structures and micro-structures formed in the sample, followed by a percolation threshold at lower, moderate and higher dopant levels, respectively, of CdCl 2 in the polymeric blend; this has been observed from DC electrical measurements as well as dispersion parameters (from optical studies) [58,59]. In figure 11d, larger values of dielectric constant and dielectric loss are observed for 0.5 and 2.2 wt% samples; it is in these samples that Cd nano-spheres and Cd nano-rods are found; here, the polarization of O − , H + , Cd 2+ and Cl − ions increase the interface area and so, there are more number of available charge carriers at low frequencies.…”

Section: 2e Dopant Concentration-dependent Dielectric Propertiesmentioning

confidence: 89%

Dielectric relaxation in a cadmium chloride-doped polymeric blend

Baraker

Lobo

2019

Bull Mater Sci

Self Cite

View full text Add to dashboard Cite

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.

show abstract

“…NVP products are of great industrial importance as they can have various applications, most importantly, in biomedical sectors and cosmetic industry. The solubility of this polymer in both aqueous and non-aqueous media, its excellent bio-tolerance is what makes this material one of the most prominent chemicals in bio-related applications [ 20 , 21 , 22 , 23 , 24 , 25 , 26 ].…”

Section: Introductionmentioning

confidence: 99%

Statistical Copolymers of N-Vinylpyrrolidone and Isobornyl Methacrylate via Free Radical and RAFT Polymerization: Monomer Reactivity Ratios, Thermal Properties, and Kinetics of Thermal Decomposition

et al. 2021

View full text Add to dashboard Cite

The synthesis of statistical copolymers of N-vinylpyrrolidone (NVP) with isobornyl methacrylate (IBMA) was conducted by free radical and reversible addition-fragmentation chain transfer (RAFT) polymerization. The reactivity ratios were estimated using the Finemann-Ross, inverted Fineman-Ross, Kelen-Tüdos, extended Kelen-Tüdos and Barson-Fenn graphical methods, along with the computer program COPOINT, modified to both the terminal and the penultimate models. According to COPOINT the reactivity ratios were found to be equal to 0.292 for NVP and 2.673 for IBMA for conventional radical polymerization, whereas for RAFT polymerization and for the penultimate model the following reactivity ratios were obtained: r11 = 4.466, r22 = 0, r21 = 14.830, and r12 = 0 (1 stands for NVP and 2 for IBMA). In all cases, the NVP reactivity ratio was significantly lower than that of IBMA. Structural parameters of the copolymers were obtained by calculating the dyad sequence fractions and the mean sequence length. The thermal properties of the copolymers were studied by differential scanning calorimetry (DSC), thermogravimetric analysis (TGA), and differential thermogravimetry (DTG). The results were compared with those of the respective homopolymers.

show abstract

Dispersion parameters of cadmium chloride doped PVA-PVP blend films

Cited by 35 publications

References 36 publications

Super‐tough biodegradable poly(vinyl alcohol)/poly(vinyl pyrrolidone) blends plasticized by glycerol and sorbitol

Super‐tough biodegradable poly(vinyl alcohol)/poly(vinyl pyrrolidone) blends plasticized by glycerol and sorbitol

Dielectric relaxation in a cadmium chloride-doped polymeric blend

Statistical Copolymers of N-Vinylpyrrolidone and Isobornyl Methacrylate via Free Radical and RAFT Polymerization: Monomer Reactivity Ratios, Thermal Properties, and Kinetics of Thermal Decomposition

Contact Info

Product

Resources

About