Characteristics of polyvinylpyrrolidone-layered silicate nanocomposites prepared by attrition ball milling

Koo, Chong Min; Ham, Hyeong Taek; Choi, Min Ho; Kim, Sang Ouk; Chung, In Jae

doi:10.1016/s0032-3861(02)00803-0

Cited by 97 publications

(70 citation statements)

References 36 publications

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“…In case of MMT clay colloidal suspension in PVP-EG blends, the intercalated EG structures can be assumed like the intercalated PEG and PEO structures, because the EG molecules have repeat units of PEG and PEO molecules. The investigation on PVP-MMT clay confirmed that the H-bonding interaction between C=O groups of PVP chain and -OH on the silicate surfaces result the large clay exfoliation in PVP-clay nanocomposites, which enhances the nanocomposite thermal property [53]. Considering all the above said facts, in the present investigation, the large enhance in σ dc values of the MMT clay loaded PVP-EG blends confirms that besides the increase of charge carriers density, there is significant enhance of structural symmetry which results the easy ionic conduction path.…”

Section: Ac Conductivity Spectramentioning

confidence: 81%

Low frequency dielectric relaxation processes and ionic conductivity of montmorillonite clay nanoparticles colloidal suspension in poly(vinyl pyrrolidone)−ethylene glycol blends

Sengwa¹,

Choudhary²,

Sankhla³

2008

Express Polym. Lett.

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Section: Ac Conductivity Spectramentioning

confidence: 81%

Low frequency dielectric relaxation processes and ionic conductivity of montmorillonite clay nanoparticles colloidal suspension in poly(vinyl pyrrolidone)−ethylene glycol blends

Sengwa¹,

Choudhary²,

Sankhla³

2008

Express Polym. Lett.

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“…Koo et al 29 attributed such a shift to lower energies in Ni nanoparticle spectra of Ni-PVP at 1661 cm À1 and assigned the C¼O stretching vibration to the chemical interaction between the PVP molecules and the nickel nanoparticle surface. This result represents strong evidence that this interaction occurs through the C¼O groups of the PVP.…”

Section: Ir Spectramentioning

confidence: 99%

“…This result represents strong evidence that this interaction occurs through the C¼O groups of the PVP. 29,30 In addition, Caykara et al 26 considered a shift of about 15 cm À1 to lower wavenumbers for the C¼O stretching band for the PVP component in a blend with sodium alginate to be a strong support to the idea that a hydrogen bond can form between ¼C¼O groups of the PVP and ÀOH groups of NaAlg. Feng et al 31 indicated that the shifts in the IR bands for PVP in a hybrid film containing ZnO nanoparticles should be attributed to the strong coulombic interaction between ZnO and the polymeric matrix.…”

Section: Ir Spectramentioning

confidence: 99%

Magnetic and optical studies on polyvinylpyrrolidone thin films doped with rare earth metal salts

Basha

2010

Polym J

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A casting technique was used to prepare new nanocomposite thin films of pure and GdCl 3 -or HoCl 3 -doped polyvinylpyrrolidone (PVP). Transmission electron microscopy (TEM) was used to study the particle size and dispersibility in the investigated nanocomposites. Magnetic measurements, using a vibrating sample magnetometer (VSM), were carried out at room temperature and applied magnetic fields up to 10 kO e . The appearance of hysteresis loops with small values of saturation flux density (B s ), remanent flux density (B r ), squareness ratio (SQR) and coercive field (H c ), along with permeability (l) values relatively higher than 1, may be taken, as a matter of experimentation, to consider the investigated composites as soft magnet materials. In this study, PVP-HoCl 3 films showed slightly better magnetic properties compared with PVP-GdCl 3 films. A comparative analysis of infrared (IR) and ultraviolet-visible spectra of the parent components and their composites indicated the effective role of dopant nature and concentration in morphological and microstructural changes occurring in the PVP matrix. Optical constants, such as the energy gap (E g ) and the Urbach tail (E e ), were determined and discussed in terms of a model based on the electronic transition between localized states in the band structure.

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“…1), 32 that dramatically increases the time necessary for the oxygen to diffuse through the polymer. Although there have been some studies involving platelet-type fillers and water-soluble polymers, [33][34][35] the oxygen permeability of these systems has not been evaluated.…”

Section: Introductionmentioning

confidence: 99%

Effect of clay concentration on the oxygen permeability and optical properties of a modified poly(vinyl alcohol)

Grunlan

Grigorian

Hamilton

et al. 2004

J of Applied Polymer Sci

119

106

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ABSTRACT:The effect of clay concentration on the oxygen permeability and optical properties of a modified poly-(vinyl alcohol) (PVOH) was studied. Sodium montmorrilonite (MMT-Na ϩ ), at a concentration of 10 wt %, was found to decrease the oxygen permeability of the PVOH below 0.001 cc ⅐ mil/m 2 /day at 55% relative humidity. This low permeability is attributed to the strong interaction between PVOH and clay, as evidenced by an increase of more than 10°C in the glass transition temperature at this concentration. Transmission electron microscopy images show the high level of clay exfoliation that results from the strong affinity to PVOH. Haze and clarity were optical properties that changed significantly with increasing clay concentration.These values were 0.4 and 100%, respectively, in the absence of clay, but became 80 and 23% with 10 wt % MMT-Na ϩ . Transmission did not change as considerably, reaching a low of 73% with a clay concentration of 10 wt %. The ability to reduce the oxygen permeability of PVOH-based systems at elevated humidity may prove advantageous for applications in food and flexible electronics packaging, where moisture sensitivity currently prevents them from being used.

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Characteristics of polyvinylpyrrolidone-layered silicate nanocomposites prepared by attrition ball milling

Cited by 97 publications

References 36 publications

Low frequency dielectric relaxation processes and ionic conductivity of montmorillonite clay nanoparticles colloidal suspension in poly(vinyl pyrrolidone)−ethylene glycol blends

Low frequency dielectric relaxation processes and ionic conductivity of montmorillonite clay nanoparticles colloidal suspension in poly(vinyl pyrrolidone)−ethylene glycol blends

Magnetic and optical studies on polyvinylpyrrolidone thin films doped with rare earth metal salts

Effect of clay concentration on the oxygen permeability and optical properties of a modified poly(vinyl alcohol)

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