3D Hierarchical orientation in polymer–clay nanocomposite films

Bafna, Ayush; Beaucage, Gregory; Mirabella, Francis M.; Mehta, S.

doi:10.1016/s0032-3861(02)00833-9

Cited by 162 publications

(88 citation statements)

References 31 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…12 Depending on the concentration of polymer and clay, the polymer type and molecular weight, the clay size, shape and surface chemistry, one may generate a variety of dispersions, 13,14 solutions, 15 smart gels, 16,18 shake gels, 19,20 glues [16][17][18] and gum-like gels [16][17][18]21,22 all of which may be excellent precursors for hierarchically structured bulk materials. 23,24 Some of these soft and hard nanocomposite materials are sensitive to external stimuli including light, temperature, pH, salt concentration, shear, pressure and electric fields, leading to novel properties that attract much scientific and technological interest. 21,24 To examine the polymer-clay interactions, a combination of methods is advisable.…”

Section: Introductionmentioning

confidence: 99%

Supramolecular structures in nanocomposite multilayered films

Stefanescu

Dundigalla

Ferreiro

et al. 2006

Phys. Chem. Chem. Phys.

View full text Add to dashboard Cite

We investigate the multilayered structures of poly(ethylene)oxide/montmorillonite nanocomposite films made from solution. The shear orientation of a polymer-clay network in solution combined with simultaneous solvent evaporation leads to supramolecular multilayer formation in the film. The resulting films have highly ordered structures with sheet-like multilayers on the micrometer length scale. The polymer covered clay platelets were found to orient in interconnected blob-like chains and layers on the nanometer length scale. Inside the blobs, scattering experiments indicate the polymer covered and stacked clay platelets oriented in the plane of the film. The polymer is found to be partially crystalline although this is not visible by optical microscopy. Atomic force microscopy suggests that the excess polymer, which is not directly adsorbed to the clay, is wrapped around the stacked platelets building blobs and the polymer also interconnects the polymer-clay layers. Overall our results suggest the re-intercalation of clay platelets in films made from exfoliated polymer-clay solutions as well as the supramolecular order and hierarchical structuring on the nanometer, via micrometer to the centimeter length scale.

show abstract

Section: Introductionmentioning

confidence: 99%

Supramolecular structures in nanocomposite multilayered films

Stefanescu

Dundigalla

Ferreiro

et al. 2006

Phys. Chem. Chem. Phys.

View full text Add to dashboard Cite

show abstract

“…Recent simultaneous small angle X-ray scattering (SAXS) and XRD studies yielded quantitative characterization of nanostructure and crystallite structure in some nanocomposites (Bafna et al, 2003). In addition, neutron membrane diffraction technique can reveal information about both the dispersion and the orientation of the inorganic layers in the polymer matrix (Katsaros et al, 2009).…”

Section: Techniques Used For the Characterization Of Nanocompositesmentioning

confidence: 99%

PVA / Montmorillonite Nanocomposites: Development and Properties

Sapalidis¹,

Katsaros²,

Kanellopoulos³

2011

Nanocomposites and Polymers With Analytical Methods

View full text Add to dashboard Cite

“…Bulk clays absorb a large volume of water, and under suitable conditions fully exfoliate in it. Two natural clays with CEC ≈ 1 meq/g are of special interest: montmorillonite (MMT) [Al l.67 During flow, their platelets orient with the major axis in the flow direction and surface usually parallel to the shear plane [Kojima et al, 1995;Varlot et al, 2001;Lele et al, 2002;Bafna et al, 2003;Galgali et al, 2004]. Upon cessation of flow in low-viscosity media, the Brownian motion leads to a randomization of the flow-imposed orientation.…”

Section: Nanoparticles and Their Surface Modificationmentioning

confidence: 99%