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Cited by 28 publications
(38 citation statements)
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References 28 publications
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“…Therefore, the measurements of the effective relaxation time for the acidic solvent protons presented in Fig. 4b are interpreted, like in other polysaccharide gels [27][28][29][30][31][32], in terms of a fast exchange which takes place between the free and bound state of water. The value of Ÿ of this solvent, after 210 ruin of hydration, is 180 ms at the outermost part of the gel layer and than gradually decreases to the center of the sample.…”
Section: Discussionsupporting
confidence: 70%
“…Therefore, the measurements of the effective relaxation time for the acidic solvent protons presented in Fig. 4b are interpreted, like in other polysaccharide gels [27][28][29][30][31][32], in terms of a fast exchange which takes place between the free and bound state of water. The value of Ÿ of this solvent, after 210 ruin of hydration, is 180 ms at the outermost part of the gel layer and than gradually decreases to the center of the sample.…”
Section: Discussionsupporting
confidence: 70%
“…D 2 O molecules do not contribute to proton NMR relaxation, which allows studying the plasticization effect of water by comparing the T 2 relaxation data for dried sample and that containing D 2 O. [22,38,39,[58][59][60] Below 80 8C, the FID for dried fiber can be described with a single component, for which the T 2 s value is typical for crystalline and glassy amorphous materials. Above 80 8C, the FID is described by three distinct components.…”
Section: Plasticization Effect and Partioning Of Water In Different Pmentioning
confidence: 99%
“…No separate relaxation component for water molecules is observed because of fast chemical exchange between hydrogen atoms of amide groups and water molecules. [53,60] The relaxation time T 2 i and the fraction of the semi-rigid amorphous phase (% T 2 i ) is the same for samples saturated with H 2 O and D 2 O, suggesting that (1) the semi-rigid fraction of the amorphous phase contains significantly less water than the soft amorphous phase ( Figure 5B); and (2) water molecules in the semi-rigid fraction of the amorphous phase, if present, are strongly immobilized because of strong hydrogen bonding to amide groups, as has been suggested in a previous NMR study. b Three types of water molecules that exhibit varying degrees of residual orientational order are present in Nylon 6 fibers.…”
Section: Plasticization Effect and Partioning Of Water In Different Pmentioning
confidence: 99%
“…Since water penetrates almost exclusively into the amorphous regions of polyamides, as has been shown by SANS, X-ray scattering, IR spectroscopy 31 injection-moulded plates of PA46, PA6 and PA66 using magnetic resonance imaging (MRI). 36,37,38 Quantitative MRI analysis has revealed a gradual decrease in the amount and molecular mobility of water from the surface towards the core part of the PA46 plates. 36 It was suggested that the fast cooling rate from the melt to the temperature of the mould, followed by fast crystallization, hampers mutual coupling of amide groups in the amorphous phase.…”
Section: Introductionmentioning
confidence: 99%
“…36,37,38 Quantitative MRI analysis has revealed a gradual decrease in the amount and molecular mobility of water from the surface towards the core part of the PA46 plates. 36 It was suggested that the fast cooling rate from the melt to the temperature of the mould, followed by fast crystallization, hampers mutual coupling of amide groups in the amorphous phase. Consequently, more loose hydrogen bonds between neighbouring amide groups leave more space for water absorption and weaken the average strength of hydrogen bonds between water and amide groups.…”
Section: Introductionmentioning
confidence: 99%