Contributions to the molecular origin of the dielectric relaxation processes in polysaccharides – the low temperature range

Meißner, Dana; Einfeldt, Jürgen; Kwasniewski, Albert

doi:10.1016/s0022-3093(00)00248-9

Cited by 61 publications

(57 citation statements)

References 18 publications

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“…Measurements on others polysaccharides as starch and dextran confirm this results [22]. A β wet relaxation mode can be observed in all wet polysaccharides in the room temperature range (0-60°C) [22][23][24][25][26][27]. This mode is not observed anymore after drying the sample [22][23][24][25][26][27].…”

Section: Introductionsupporting

confidence: 71%

“…A β wet relaxation mode can be observed in all wet polysaccharides in the room temperature range (0-60°C) [22][23][24][25][26][27]. This mode is not observed anymore after drying the sample [22][23][24][25][26][27]. The hydration influence of polysaccharides on their dielectric properties can be interpreted by several hypotheses: one the one hand, the OH-groups of glucosidic units form hydrogen bonds with water molecules.…”

Section: Introductionmentioning

confidence: 96%

“…Dielectric dynamic spectroscopy (DDS) has been already used on polysaccharides like cellulose and its derivatives [22][23][24][25][26][27][28][29]. Four dielectric relaxations modes are usually observed γ, β, β wet and α, in the order of increasing temperatures [22][23][24][25][26][27][28][29].…”

Section: Introductionmentioning

confidence: 99%

“…Four dielectric relaxations modes are usually observed γ, β, β wet and α, in the order of increasing temperatures [22][23][24][25][26][27][28][29]. The dielectric properties of cellulose have been also investigated by combined DDS/TSC [28].…”

Section: Introductionmentioning

confidence: 99%

See 3 more Smart Citations

Influence of hydrogen bonds on glass transition and dielectric relaxations of cellulose

Roig¹,

Dantras²,

Dandurand³

et al. 2011

J. Phys. D: Appl. Phys.

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The molecular dynamic in hydrated cellulose has been investigated by a combination of thermal analyses and dielectric spectroscopy. Differential Scanning Calorimetry (DSC) shows the dependence upon hydration of the glass transition temperature T g . A physical ageing phenomenon has been observed. At the molecular scale, bound water is hydrogen bonded to polar sites of cellulose macromolecules. At the macroscopic scale, water molecules play the role of a plasticizer for cellulose lowering its T g . Dynamic Dielectric Spectroscopy (DDS) combined with Thermostimulated Currents (TSC) have allowed us to follow more localized molecular mobility. The β relaxation mode is characterized by activation entropies that vanish for higher water contents indicating molecular mobility localization. It is plasticized by water like the glass transition. This analogy is explained by a common origin of both mechanisms: the mobility of the cellulose backbone. The evolution of the γ mode upon hydration follows an anti-compensation law. Water acts as an anti-plasticizer in a hydrogen bonded network.

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Section: Introductionsupporting

confidence: 71%

Section: Introductionmentioning

confidence: 96%

Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

See 2 more Smart Citations

Influence of hydrogen bonds on glass transition and dielectric relaxations of cellulose

Roig¹,

Dantras²,

Dandurand³

et al. 2011

J. Phys. D: Appl. Phys.

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“…In order of increasing temperature, the loss isochrones for all samples present a β-relaxation, located near − 110 °C and related to the local chain dynamics of the cell II polysaccharide chains [28,29]. The high temperature side of the β-process overlaps with the low temperature side of a complex peak, centred near − 60 °C, which can be decomposed into α and α′-relaxations associated, respectively, with the T g s of NR and the lipid component (SA), present in NR not only as a natural impurity but also as an additive [15].…”

Section: Dielectric Spectroscopy (Ds)mentioning

confidence: 99%

Electrical conductivity of natural rubber–cellulose II nanocomposites

Ortiz-Serna

Carsí

Redondo-Foj

et al. 2014

Journal of Non-Crystalline Solids

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Nanocomposite materials obtained from natural rubber (NR) reinforced with different amounts of cellulose II (cell) nanoparticles (in the range of 0 to 30 phr) are studied by dielectric spectroscopy (DS) in a broad temperature range (− 150 to 150 °C). For comparative purposes, the pure materials, NR and cell, are also investigated. An analysis of the cell content effect on the conductive properties of the nanocomposites was carried out. The dielectric spectra exhibit conductivity phenomena at low frequencies and high temperatures: Maxwell-Wagner-Sillars (MWS) and electrode polarization (EP) conductive processes were observed in the nanocomposite samples.

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