Water sorption and thermally stimulated depolarization currents in nylon-6

Frank, Benjamin; Frübing, Peter; Pissis, P.

doi:10.1002/(sici)1099-0488(199608)34:11<1853::aid-polb2>3.0.co;2-t

Cited by 53 publications

(57 citation statements)

References 4 publications

(4 reference statements)

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“…For instance, lowering the activation energy of the secondary relaxation in nylon 6,6 and amorphous cellulose with the addition of water was observed by dielectric spectroscopy (37) and dynamic mechanical analysis (38), respectively. In addition, an increase of the dielectric strength of one secondary relaxation process at the expense of the other secondary relaxation process with higher water content was reported earlier on nylon-6 utilizing thermally stimulated depolarization currents (TSDC) (39).…”

Section: Dielectric Relaxation Spectroscopy Studycontrasting

confidence: 80%

Hydrophilic Absorbable Copolyester Exhibiting Zero-Order Drug Release

et al. 2006

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Section: Dielectric Relaxation Spectroscopy Studycontrasting

confidence: 80%

Hydrophilic Absorbable Copolyester Exhibiting Zero-Order Drug Release

et al. 2006

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“…[141][142][143] FTIR data as well as the Brunauer-Emmett-Teller model for sorption also support three species of water that differ in the degree of hydrogen-bonding, ranging from singly to doubly hydrogen-bonded (icelike) water. 144 …”

Section: State Of Watermentioning

confidence: 99%

Hydrogen bonding, mobility, and structural transitions in aliphatic polyamides

Murthy

2006

J Polym Sci B Polym Phys

215

197

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Some salient results in nylon research are reviewed to identify the fundamental principles that are applicable to other strongly interacting or hydrogenbonded polymers, including proteins. The effects of hydrogen bonds on stress-, heat-, and solvent-induced changes in macroscopic properties are discussed. These data provide a window into the chain mobility and linkages between the crystalline and amorphous domains, both of which are important for any predictive model. The changes in the characteristics of the amorphous phase with the crystallinity and orientation require that it be modeled with at least two components: a rigid/immobile/ anisotropic component and a soft/ mobile/isotropic component. The deformation and shrinkage behavior of these polymers are discussed in terms of the relative contributions of the amorphous and crystalline domains and of the interactions between them. The premelting crystalline transition is accompanied by the merging of intersheet and intrasheet diffraction peaks in some nylons, as observed by Brill, and not in others even though the underlying mechanism that gives rise to these transitions, the onset of volume-increasing librational motion of the crystalline stems, is the same. Because the effects of the temperature, deformation, and solvent have a common origin associated with mobility, a fictive temperature can be associated with a given solvent activity or stress level. The magnitude of this fictive temperature is the amount by which the glass or Brill transition temperature is reduced in the presence of solvents ($50 8C) or stress or by which the annealing temperature can be reduced in the presence of a solvent (or active stress) to achieve the same structural state as that of a dry (or static) polymer.

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“…Three relaxations can be identified in all samples. They were identified and reported for the pure PA6 [21][22][23][24]. In the present work, the effect of water on the relaxation processes is considered to be negligible, due to the initial drying of the materials prior to testing.…”

Section: Dielectric Spectroscopymentioning

confidence: 72%

“…This explains the increase in Young's modulus for the nanocomposites. Assignment of molecular motions associated with the β-relaxation is complicated and a number of varying opinions exist in the literature [21][22][23][24]. However, these motions should be connected with the motion of amide groups together with neighboring methylene groups, and size of this moving unit is comparable to the size of the fullerene C 60 molecule.…”

Section: Dielectric Spectroscopymentioning

confidence: 81%

Dielectric relaxation of fulleroid materials filled PA6 composites and the study of its mechanical performance

Sinitsin¹,

Zuev²

2015

Nanosist.: fiz. him. mat.

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The effect of fulleroid materials (fullerene C 60 and fullerene soot which is used for fullerenes production) on the mechanical properties of polymer nanocomposites based on polyamide 6 (PA6) was investigated. Composites were synthesized by direct mixing in an extruder. Dielectric spectroscopy was used to investigate the influence of nanoparticles on relaxation processes in the polymer matrix. It is found that the segmental relaxation processes becomes faster with the addition of fullerene C 60 . In contrast, the secondary processes of PA6/fullerene C 60 nanocomposites were observed to slow down with the addition of fullerene C 60 . This means that the local 'molecular stiffness' is increased, and a phenomenological link between the secondary relaxation times and the mechanical properties explains the increase in the Young's modulus of the nanocomposites upon the addition of C 60 . These observations suggest that nanoparticles can have a qualitatively different effect on the matrix polymer dynamics at different length scales, and caution must be taken in comparing the changes in the dynamics associated with different relaxation processes.

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Water sorption and thermally stimulated depolarization currents in nylon-6

Cited by 53 publications

References 4 publications

Hydrophilic Absorbable Copolyester Exhibiting Zero-Order Drug Release

Hydrophilic Absorbable Copolyester Exhibiting Zero-Order Drug Release

Hydrogen bonding, mobility, and structural transitions in aliphatic polyamides

Dielectric relaxation of fulleroid materials filled PA6 composites and the study of its mechanical performance

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