FTIR-ATR studies of the sorption and diffusion of acetone:water mixtures in poly(vinyl alcohol)-clay nanocomposites

Breen, Alastair F.; Breen, Christopher; Clegg, Francis; Döppers, Leena-Marie; Khairuddin, Khairuddin; Labet, Marianne; Sammon, Chris; Yarwood, J.

doi:10.1016/j.polymer.2012.07.057

Cited by 16 publications

(21 citation statements)

References 78 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…The high temperatures at which these endothermic transitions take place indicate that water is very strongly associated with the polymers. The observations are analogous with Breen et al . who found by TG–MS analysis that the temperature over which water was evolved from a pure PVOH film reached a maximum at 140°C.…”

Section: Resultssupporting

confidence: 89%

“…The extent of the increasing baseline correlates with the filler loading and is associated with an increasing amount of X‐ray scatter due to the nanoscale dispersion of the clay layers. Breen et al . also reported the absence of diffraction peaks in PVOH–Cloisite Na + nanocomposite films at clay additions below 25 wt %, which was taken as a confirmation of extensively dispersed clay platelets in the polymer matrix.…”

Section: Resultsmentioning

confidence: 91%

See 1 more Smart Citation

Effect of clay type on dispersion and barrier properties of hydrophobically modified poly(vinyl alcohol)–bentonite nanocomposites

Johansson

Clegg

2015

J of Applied Polymer Sci

Self Cite

View full text Add to dashboard Cite

The oxygen and water vapor permeability at high relative humidity was studied for composite films formed by incorporation of three different bentonites (MMT) into an ethylene-modified, water-soluble poly(vinyl alcohol), EPVOH. The oxygen permeability decreased linearly with an increased addition of hydrophilic MMTs. X-ray diffraction and Fourier transform infrared spectroscopy suggested a homogeneous distribution in the thickness direction with disordered and probably exfoliated structures for hydrophilic MMTs. In contrast, organophilic modified clay showed an intercalated structure with the clay preferentially located at the lower film surface, a combination which was however efficient in reducing the water vapor-and oxygen permeabilities at low addition levels. Composite films of EPVOH and Na 1 -exchanged MMT resulted in high resistance to dissolution in water, which was ascribed to strong interactions between the components resulting from matching polarities. Annealing the films at 120 C resulted in enhanced resistance to water dissolution and a further reduction in oxygen permeability.

show abstract

Section: Resultssupporting

confidence: 89%

Section: Resultsmentioning

confidence: 91%

Effect of clay type on dispersion and barrier properties of hydrophobically modified poly(vinyl alcohol)–bentonite nanocomposites

Johansson

Clegg

2015

J of Applied Polymer Sci

Self Cite

View full text Add to dashboard Cite

show abstract

“…Poly(vinyl alcohol), PVOH, is a synthetic polymer that offers good film‐forming and coating properties and the films or coatings produced are proven effective barrier materials to oxygen and other gases. PVOH has also been widely used as a model polymer for studying properties of hydrophilic polymers, due to its simple and well‐defined chemical structure …”

Section: Introductionmentioning

confidence: 99%

Hydrophobically modified poly(vinyl alcohol) and bentonite nanocomposites thereof: Barrier, mechanical, and aesthetic properties

Johansson

Clegg

2014

J of Applied Polymer Sci

Self Cite

View full text Add to dashboard Cite

Composite films were formed by incorporating three different bentonites into an ethylene modified, water‐soluble poly(vinyl alcohol), EPVOH. The interaction of EPVOH with both hydrophilic and hydrophobic bentonites was investigated. EPVOH provided lower water vapor and oxygen transmission rates compared to a conventional PVOH grade when exposed at high relative humidities (70–90% RH). EPVOH films which exhibited oxygen barrier properties comparable to that of a biaxially oriented PET packaging film at 80% RH were produced. High compatibility between EPVOH and hydrophilic bentonites provided an even distribution of clay platelets in the composites. A strong increase in Young's modulus with increased addition of any of the three bentonites was found. At low addition levels the hydrophobic bentonite proved to be effective in terms of maintaining high elongation at break, high transparency and high gloss. © 2014 Wiley Periodicals, Inc. J. Appl. Polym. Sci. 2015, 132, 41737.

show abstract

“…The PEG molecules may also interact with the Si-O groups through their ether oxygens. Direct coordination of polar organic species with exchangeable 4 cations via ion-dipole interactions is possible, but the polarizing power of the exchangeable cations usually means that the interaction between montmorillonites and organic material is achieved via water bridges. For instance, Parfitt and Greenland 11 showed that PEGs of different molecular weight (200 -20000) were strongly adsorbed on Cs, Na, Ca and Almontmorillonites from aqueous solution and suggested the cation retained its hydration shell which precluded the formation of a direct, inner-sphere association.…”

Section: Introductionmentioning

confidence: 99%

Synergistic and Competitive Aspects of the Adsorption of Poly(ethylene glycol) and Poly(vinyl alcohol) onto Na-Bentonite

2014

Self Cite

View full text Add to dashboard Cite

The competitive adsorption of poly(ethylene glycol) (PEG) and poly(vinyl alcohol) (PVOH) onto Na-bentonite has been assessed quantitatively. Particular emphasis was focused on the amount of organic located within the bentonite interlayer and any subsequent effects on the extent of layer expansion. The individual isotherms showed strong adsorption for both PVOH and PEG at amounts lower than the quantities required to produce fully loaded bilayer (0.33 g of PVOH/g of clay) and single layered structures (0.10 g of PEG/g of clay), respectively. Above these concentrations the incremental amounts adsorbed were smaller, and the concentration of adsorbates in solution gradually increased. Na-bentonite adsorbed more PVOH than PEG at any given concentration. In the competitive study the amount of PVOH adsorbed was enhanced in the presence of PEG (0.10 and 0.30 g/g clay), but less PEG was adsorbed. At low loadings of PVOH (0.02-0.10 g/g clay) the amount of adsorbed PEG was increased but at higher PVOH levels PEG adsorption was reduced. The XRD data showed stepped changes in the d-spacing as the adsorbed amounts of both PEG and PVOH increased. The PEG-bentonite samples did not expand beyond a bilayer structure (18 Å), but the XRD data for PVOH-treated samples indicated the formation of multilayer structures (d ≥ 44 Å).

show abstract

FTIR-ATR studies of the sorption and diffusion of acetone:water mixtures in poly(vinyl alcohol)-clay nanocomposites

Cited by 16 publications

References 78 publications

Effect of clay type on dispersion and barrier properties of hydrophobically modified poly(vinyl alcohol)–bentonite nanocomposites

Effect of clay type on dispersion and barrier properties of hydrophobically modified poly(vinyl alcohol)–bentonite nanocomposites

Hydrophobically modified poly(vinyl alcohol) and bentonite nanocomposites thereof: Barrier, mechanical, and aesthetic properties

Synergistic and Competitive Aspects of the Adsorption of Poly(ethylene glycol) and Poly(vinyl alcohol) onto Na-Bentonite

Contact Info

Product

Resources

About