Morphological Changes in Nylon 6 and Effect on Mechanical Properties IV. Stress-Strain Cycles

Hoashi, Koji; Kawasaki, Nobuhiro; Andrews, R. D.

doi:10.1007/978-1-4615-8951-8_16

Cited by 7 publications

(2 citation statements)

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“…In regimes where PA6TI and PA6TI-66 showed both a yield-drop and significant ductility, post-yield strain hardening was observed for 𝜀 up to close to the nominal strain to failure, 𝜀 7 . By contrast, at 𝑇 < 𝑇 -, the stress-strain curves for PA66 reflected the double yielding behavior typical of dry specimens of this and other similar aliphatic polyamides, an initial weak yield-drop being followed by a second broad maximum in 𝜎 at higher 𝜀, beyond which 𝜎 gradually decreased as 𝜀 approached 𝜀 7 [48,49]. there was no distinct yield point and 𝜎 + was defined as the intercept of the tangent to the stress-strain curve at zero strain to the tangent of the stress-strain curve at 50 % strain).…”

Section: Resultsmentioning

confidence: 79%

High-performance polyamides with engineered disorder

et al. 2021

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Section: Resultsmentioning

confidence: 79%

High-performance polyamides with engineered disorder

et al. 2021

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“…It is known that nylon can be plasticized by various molecules such as water, alcohols, acids, and phenols − Andrews et al have examined the effect of phenol absorption on the mechanical properties of nylon films. − Since phenol is a solid at room temperature, it is first dissolved in CCl 4 and nylon 6 is then put into the resulting solution. The phenol molecules penetrate into the amorphous regions of nylon 6.…”

Section: Introductionmentioning

confidence: 99%

Deuterium Nuclear Magnetic Resonance of Phenol-d₅ in Nylon 6 under Active Uniaxial Deformation

1999

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A stretching device suitable for fitting within a deuterium nuclear magnetic resonance (NMR) probe was constructed to investigate the large strain uniaxial tensile deformation behavior of nylon 6 plasticized by 40 wt % of phenol-d 5. The phenol-d 5 molecules probe the environment of the amorphous regions in nylon 6; the phenol-d 5 molecules do not exist in a “free” state, and they remain associated with the amide groups by hydrogen bonding during deformation. Deuterium NMR spectra show that the quadrupolar splitting varies linearly with strain throughout the experiment, indicating that the orientation of the phenol-d 5 molecules in the amorphous phase is simply a function of strain and not of stress. The line width increases with strain at low-to-moderate strains but attains a constant value at large strains (in the strain-hardening regime). From low-to-moderate strains, the line width behavior arises from a decrease in the translational motion of the phenol-d 5 molecules between amide groups in the amorphous chains during elastic deformation and during the transformation of the lamellar structure of nylon 6 to a fibrillar one. At large strains, the existence and deformation of the fibrillar structure cause the phenol-d 5 molecules to be confined to their respective amide groups on the time scale of the NMR measurement (∼0.1 ms), resulting in a constant line width.

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Double Yielding in Injection‐Molded Polycarbonate/Polyethylene Blends: Composition Dependence

Pan

Ning

et al. 2006

Macro Materials & Eng

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Summary: A fiber‐dependent double yielding phenomenon was recently observed in a structurally different blend, PC/HDPE, in which the first yield point is yielding of HDPE, and the second is caused by the yielding of injection‐induced PC fibers. The present study described the composition dependence of the double yielding in PC/HDPE blends with PC contents ranging from 0 to 45 wt.‐%. Morphology observation indicated that the injection‐molded PC/HDPE blends displayed a typical skin‐core structure with more or less injection‐induced elongated PC particles in the sub‐skin layers, and spherical PC particles in the core layers. Stress‐strain curves indicated that the blends with PC contents from 10 to 20 wt.‐% exhibit double yielding behavior and the cold drawing zone after the second yield point shortens with increasing PC content. The blends with too low‐ or too high‐PC contents exhibited only one yield point. Scanning electronic microscope micrographs of the blend with 15 wt.‐% PC showed that when the strain was beyond the first yield point the PC fibers notably yielded and even were broken, which served as an evidence that the yielding of PC phase was responsible for the second yielding. The origin of the composition dependence of the double yielding was discussed in detail through the interfacial stress transfer.Representative stress‐strain curves for PE10, PE15, PE17.5, and PE20.imageRepresentative stress‐strain curves for PE10, PE15, PE17.5, and PE20.

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Morphological Changes in Nylon 6 and Effect on Mechanical Properties IV. Stress-Strain Cycles

Cited by 7 publications

References 1 publication

High-performance polyamides with engineered disorder

High-performance polyamides with engineered disorder

Deuterium Nuclear Magnetic Resonance of Phenol-d₅ in Nylon 6 under Active Uniaxial Deformation

Double Yielding in Injection‐Molded Polycarbonate/Polyethylene Blends: Composition Dependence

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Morphological Changes in Nylon 6 and Effect on Mechanical Properties IV. Stress-Strain Cycles

Cited by 7 publications

References 1 publication

High-performance polyamides with engineered disorder

High-performance polyamides with engineered disorder

Deuterium Nuclear Magnetic Resonance of Phenol-d5 in Nylon 6 under Active Uniaxial Deformation

Double Yielding in Injection‐Molded Polycarbonate/Polyethylene Blends: Composition Dependence

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Product

Resources

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Deuterium Nuclear Magnetic Resonance of Phenol-d₅ in Nylon 6 under Active Uniaxial Deformation