NMR dispersion studies of poly(ethylene oxide)/sodium montmorillonite nanocomposites

Krzaczkowska, J.; Strankowski, Michał; Jurga, Stefan; Jurga, K.; Pietraszko, A.

doi:10.1016/j.jnoncrysol.2010.02.005

Cited by 17 publications

(9 citation statements)

References 24 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…These findings are in qualitative agreement with results of Jurga et al concerning PEO in the interlayer space of MTM . The results of this study should, however, be handled with care, because proton T 1 relaxation was measured and interpreted, which is subject to paramagnetic impurity effects and de-localization due to spin diffusion.…”

Section: Results and Discussionsupporting

confidence: 91%

“…These findings are in qualitative agreement with results of Jurga et al concerning PEO in the interlayer space of MTM. 50 The results of this study should, however, be handled with care, because proton T 1 relaxation was measured and interpreted, which is subject to paramagnetic impurity effects and de-localization due to spin diffusion. We finally comment on the comparison of the T 2r results to a value measured for PEO absorbed to spherical silica particles, 42−44 which is also included in Figure 7b.…”

Section: ■ Experimental Sectionmentioning

confidence: 99%

See 1 more Smart Citation

Structure, Mechanical Properties, and Dynamics of Polyethylenoxide/Nanoclay Nacre-Mimetic Nanocomposites

et al. 2020

View full text Add to dashboard Cite

Nacre-mimetic nanocomposites based on high fractions of synthetic high-aspect-ratio nanoclays in combination with polymers are continuously pushing boundaries for advanced material properties, such as high barrier against oxygen, extraordinary mechanical behavior, fire shielding, and glass-like transparency. Additionally, they provide interesting model systems to study polymers under nanoconfinement due to the well-defined layered nanocomposite arrangement. Although the general behavior in terms of forming such layered nanocomposite materials using evaporative self-assembly and controlling the nanoclay gallery spacing by the nanoclay/polymer ratio is understood, some combinations of polymer matrices and nanoclay reinforcement do not comply with the established models. Here, we demonstrate a thorough characterization and analysis of such an unusual polymer/nanoclay pair that falls outside of the general behavior. Poly(ethylene oxide) (PEO) and sodium fluorohectorite form nacre-mimetic, lamellar nanocomposites that are completely transparent and show high mechanical stiffness and high gas barrier, but there is only limited expansion of the nanoclay gallery spacing when adding increasing amounts of polymer. This behavior is maintained for molecular weights of PEO varied over four orders of magnitude and can be traced back to depletion forces. By careful investigation via X-ray diffraction and proton low-resolution solid-state NMR, we are able to quantify the amount of mobile and immobilized polymer species in between the nanoclay galleries and around proposed tactoid stacks embedded in a PEO matrix. We further elucidate the unusual confined polymer dynamics, indicating a relevant role of specific surface interactions.

show abstract

Section: Results and Discussionsupporting

confidence: 91%

Section: ■ Experimental Sectionmentioning

confidence: 99%

Structure, Mechanical Properties, and Dynamics of Polyethylenoxide/Nanoclay Nacre-Mimetic Nanocomposites

et al. 2020

View full text Add to dashboard Cite

show abstract

“…Using the field-cycling NMR technique again, the phenomenon was also identified in poly(ethylene oxide)/sodium montmorillonite nanocomposites. 10 Finally, an equivalent behavior was reported for immiscible polymer blends studied by mechanical relaxation. 11 In a recent publication, 12 it was concluded from neutron scattering data that the corset effect can be "ruled out."…”

mentioning

confidence: 67%

Comment on “Neutron scattering study of the dynamics of the polymer melt under nanoscopic confinement” [J. Chem. Phys. 131, 174901 (2009)]

Kimmich

Fatkullin

2011

The Journal of Chemical Physics

View full text Add to dashboard Cite

“…In Ref. [101], field-cycling NMR relaxometry was used to examine poly(ethylene oxide)/sodium montmorillonite nanocomposites. The general tendency in such layered confinement structures is that confinement leads to a more anisotropic character of segment reorientation so that the orientation correlation function decays more slowly at least as concerns its long-time tail [102].…”

Section: Experimental Results For Techniques Sensitive To Orientationmentioning

confidence: 99%

Molecular Dynamics in Polymers

Kimmich

2012

Principles of Soft-Matter Dynamics

View full text Add to dashboard Cite

Suitably modified versions of the Langevin equation introduced in Chap. 2 will be taken as a general basis for analytical explanations of macromolecular-chain motions. The reader will straightforwardly be led from the dynamics of freely draining polymer chains as the simplest case to entangled-chain phenomena and finally to mesoscopic confinement effects. The Langevin equation-based treatments will be supplemented step by step by additional force terms specific for the diverse model scenarios. The restriction to this equation-of-motion strategy is expected to favor the comprehensibility of this demanding field. The relaxation-mode solutions will be expressed in the form of predictions for diverse experimental techniques outlined in Chap. 3. This in particular refers to spin-lattice relaxation, coherent and incoherent neutron scattering, and mechanical relaxation.

show abstract

NMR dispersion studies of poly(ethylene oxide)/sodium montmorillonite nanocomposites

Cited by 17 publications

References 24 publications

Structure, Mechanical Properties, and Dynamics of Polyethylenoxide/Nanoclay Nacre-Mimetic Nanocomposites

Structure, Mechanical Properties, and Dynamics of Polyethylenoxide/Nanoclay Nacre-Mimetic Nanocomposites

Comment on “Neutron scattering study of the dynamics of the polymer melt under nanoscopic confinement” [J. Chem. Phys. 131, 174901 (2009)]

Molecular Dynamics in Polymers

Contact Info

Product

Resources

About