Microstructure and free volume evaluation of poly(vinyl alcohol) nanocomposite hydrogels

Paranhos, Caio Márcio; Soares, Bluma G.; Machado, Juliana Costa; Windmöller, Dario; Pessan, Luiz Antônio

doi:10.1016/j.eurpolymj.2007.10.001

Cited by 57 publications

(36 citation statements)

References 38 publications

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“…From Fig. 3a it can be seen that the quantity (X cr ) and the size of crystals (directly related with T m ) [27] increased as a function of the annealing temperature.…”

Section: Resultsmentioning

confidence: 95%

The effect of the annealing on the poly(vinyl alcohol) obtained by freezing–thawing

Gonzalez

Álvarez

2011

Thermochimica Acta

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“…From Fig. 3a it can be seen that the quantity (X cr ) and the size of crystals (directly related with T m ) [27] increased as a function of the annealing temperature.…”

Section: Resultsmentioning

confidence: 95%

The effect of the annealing on the poly(vinyl alcohol) obtained by freezing–thawing

Gonzalez

Álvarez

2011

Thermochimica Acta

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“…The interfacial adhesion between the two compatibilized components leads to the formation of an interfacial layer, which is helpful for the stress transfer between the nanoparticles and the matrix. These regions, however, may contribute to the enhancement of the overall free volume, especially when the interaction is weak [46,47]. Interstitial cavities in the filler agglomerates: In the case that the exfoliation is not complete, there will be stacks of nanolayers (intercalated morphology) inside the polymer.…”

Section: Effects Of Nanoparticles On Polymer Free Volumementioning

confidence: 97%

Recent Developments in the Permeability of Polymer Clay Nanocomposites

Choudalakis

Gotsis

2013

Handbook of Polymernanocomposites. Processing, Performance and Application

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“…The free volume hole of PVA (MW 120,000) measured by positron annihilation lifetime spectroscopy (PALS) is 50 Å 3 . 18 The calculated molecular volume of NR is 285 Å 3 in which the volume moiety of diethylamino group is 87 Å 3 and the other part is 198 Å 3 . 19 The free volume hole of PVA is smaller than the diethylamino moiety of NR.…”

Section: Resultsmentioning

confidence: 99%

Photomechanical Effects in a Dye-Doped Polymer Nanocomposite

Jee¹,

Lee²

2011

J. Nanosci. Nanotech.

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Nile Red (NR) has been widely used as a microenvironmental probe since its luminescence characteristics depend strongly on medium polarity, viscosity, and hydrophobicity. The driving source for the internal motion of NR in rigid media is an absorbed photon that induces the molecule to rotate internally, causing the matrix deformed. Reversible (elastic) deformation and irreversible (plastic) deformation will influence the twisting dynamics in a different manner. In this work, we have investigated its excited state motion in a polymer nanocomposite, wherein polyvinyl alcohol (PVA) and nanodiamonds (NDs) were used as a matrix and a filler, respectively. PVA is a hydrophilic polymer having good chemical resistance, processability, and gel formation ability. Nanodiamond is a good candidate as a nanofiller for polymer composites. The elastic modulus of the polymer nanocomposite was measured by atomic force microscopy (AFM) nanoindentation and the emission lifetime of NR embedded in the polymer nanocomposite by time-resolved emission spectroscopy. Our results show that the fluorescence lifetime of NR is correlated well to the elastic modulus of polymer nanocomposite.

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Microstructure and free volume evaluation of poly(vinyl alcohol) nanocomposite hydrogels

Cited by 57 publications

References 38 publications

The effect of the annealing on the poly(vinyl alcohol) obtained by freezing–thawing

The effect of the annealing on the poly(vinyl alcohol) obtained by freezing–thawing

Recent Developments in the Permeability of Polymer Clay Nanocomposites

Photomechanical Effects in a Dye-Doped Polymer Nanocomposite

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