Effect of Moisture Content on Stress Ageing of Nylon 6

Verma, Anjeet; Deopura, B. L.; Sengupta, Amartya

doi:10.1177/004051758405400203

Cited by 4 publications

(1 citation statement)

References 13 publications

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“…Moisture also affects fracture behavior 118 and stress-aging characteristics. 119,120 As an explanation for such effects, water is said to loosen up the structure 117,121 or soften nylons, in effect acting as a plasticizer. 122,123 It is possible to gain a better understanding of the solventinduced changes and thus enhance the material properties with the results published over the last 20 years on the effects of water on the relaxation processes, chain mobility, amorphous orientation, phase transitions, diffusion of gases, and mechanical properties.…”

Section: Solvent Effectsmentioning

confidence: 99%

Hydrogen bonding, mobility, and structural transitions in aliphatic polyamides

Murthy

2006

J Polym Sci B Polym Phys

222

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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Section: Solvent Effectsmentioning

confidence: 99%

Hydrogen bonding, mobility, and structural transitions in aliphatic polyamides

Murthy

2006

J Polym Sci B Polym Phys

222

197

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Hydration in semicrystalline polymers: Small‐angle neutron scattering studies of the effect of drawing in nylon‐6 fibers

Murthy¹,

Orts

1994

J Polym Sci B Polym Phys

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Water absorbed by nylons appears to be partitioned into interlamellar and interfibrillar spaces. The amount of water in the interfibrillar region remains essentially unchanged with increasing draw ratio, whereas that in the interlamellar regions decreases with draw ratio; the latter accounts for the decrease in the water uptake in the drawn fibers. These results suggest that the amount of the amorphous material in the interfibrillar regions remains unchanged during drawing, and the increase in the crystallinity during drawing results from the incorporation of the amorphous chain segments in the interlamellar regions into the crystalline lamellae. Further, the interfibrillar water is more tightly bound than the interlamellar water. The length of the longitudinal channels into which water diffuses is about the same as that of the fibrils, and increases from ca. 1500 to 2000 Å upon drawing. The longitudinal channels are highly oriented even in undrawn fibers, and their misorientation increases from 5° to 15° upon drawing. These channels can be described as surface fractals of dimension 3.4–3.6. © 1994 John Wiley & Sons, Inc.

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The effect of heat setting on the elastic and viscoelastic properties of nylon-6 films

Bhat

Kelkar

1989

Journal of Macromolecular Science, Part B

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The elastic and viscoelastic properties of nylon-6 films with different structural forms and different degrees of crystallinity, obtained by heat setting nylon-6 films at various temperatures, without constraint, have been investigated. The elastic modulus increases with increasing degree of crystallinity. The values of the transverse elastic moduli for completely amorphous and completely crystalline samples have been calculated on the basis of these results. The measurements of dynamic mechanical properties were carried out at two different frequencies, v i z . , 11 Hz and 110 H z , over a range of temperature from room temperature to 1 5 O O C under ambient conditions of humidity. It is observed that the moisture content increases whereas the glass transition temperature decreases with increasing temperature of pretreatment. The activation energy of the a transition has also been calculated. 375

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Effect of Moisture Content on Stress Ageing of Nylon 6

Cited by 4 publications

References 13 publications

Hydrogen bonding, mobility, and structural transitions in aliphatic polyamides

Hydrogen bonding, mobility, and structural transitions in aliphatic polyamides

Hydration in semicrystalline polymers: Small‐angle neutron scattering studies of the effect of drawing in nylon‐6 fibers

The effect of heat setting on the elastic and viscoelastic properties of nylon-6 films

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