Unravelling physical origin of the Bauschinger effect in glassy polymers

Zhu, Panpan; Lin, Ji; Zhou, Haofei

doi:10.1016/j.jmps.2022.105046

Cited by 11 publications

(2 citation statements)

References 64 publications

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“…In other words, the collective density of H-bonds remains relatively constant in the elastic regime. This is consistent with the view that glassy state polymer chains can overcome localized confirmations (i.e., activation barriers) upon yielding. − H-bond induced dynamic cross-linking is expected to decrease the molecular mobility (and increase the activation energy) which could lead to increases in E , σ y and U r .…”

Section: Resultssupporting

confidence: 83%

“…Subsequently, a cycle of reformation and rupture of H-bonds due to continuing plastic deformation occurs until the sample fails. The excess work done to overcome the constraints on molecular motion imposed by, and the repeated deformation of the dynamically cross-linking H-bonds results in the observed increase in toughness. − Strain hardening response ( E H ) associated with the dynamical reformation of H-bonds during the plastic deformation process is expected to increase σ f . It is important to realize that failure strength would increase even with little to no improvement in strain hardening due to H-bonding, because of the previously observed monotonic increase in yield strength; the intrinsic strain hardening mechanisms of the polymer will ensure an increase in failure strength (beyond yield stress, i.e., σ f ≥ σ y for E H ≥ 0) as long as the fibers are not brittle.…”

Section: Resultsmentioning

confidence: 99%

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Influence of Size and H-bonding on the Elasto-Plastic Mechanical Behavior of PVP–TA Nanofibers

Gaikwad,

Kolluru

2024

ACS Appl. Polym. Mater.

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Developing advanced structural polymers with simultaneously high strength and toughness remains a significant materials design challenge. Two strategies that have been used in different polymers to address this challenge are dynamically cross-linking polymer chains through hydrogen bonds (H-bonds) and reducing the dimensions of polymeric structures to submicron length scales (i.e., size effects). The current study aims to understand the direct role of relatively weak H-bonds in improving the elasto-plastic mechanical properties of the much stronger glassy state polymers, which remains unclear in the existing literature. At the same time, the potential to combine H-bonding and size effects to synergistically achieve greater improvements in strength and toughness will be studied in this work. To this goal the large deformation elasto-plastic deformation response of single poly(vinylpyrrolidone)–tannic acid (PVP–TA) nanofibers of varying fiber diameters and TA concentrations (i.e., H-bonding) were characterized through submicron-scale tensile experiments. The results indicated that H-bonding was capable of directly and significantly improving the mechanical behavior of glassy PVP. H-bonding and size effects were found to affect the elastic and plastic properties differently. While these two effects were synergistic in the elastic regime, their interaction was more complex in the plastic deformation regime in general and for the thinnest fibers in particular. These observations provide useful insights into the design of improved H-bonded polymers for small-scale multifunctional applications.

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Section: Resultssupporting

confidence: 83%

Section: Resultsmentioning

confidence: 99%

Influence of Size and H-bonding on the Elasto-Plastic Mechanical Behavior of PVP–TA Nanofibers

Gaikwad,

Kolluru

2024

ACS Appl. Polym. Mater.

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Coarse-grained molecular dynamics simulation on strain-hardening and fracture behaviors of polycarbonate: Effect of polydispersity and spatial distribution

Leelaprachakul,

Kubo,

Umeno

2023

J Polym Res

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Coarse-grained molecular dynamics simulation of polycarbonate is utilized to investigate the relationship between molecular structure (i.e., polydispersity and molecular spatial distribution) and strain-hardening and fracture behavior of polycarbonate. We find that strain-hardening modulus and chain extensibility, which are the constitutive parameters of the Eindhoven Glassy Polymer model are highly affected by spatial distribution but are insensitive to polydispersity. This is attributed to the higher rate of nonaffine deformation in the structure with a high radius of gyration. On the other hand, maximum stress at fracture is highly influenced by both spatial distribution and polydispersity due to the ability to sustain entanglements at larger strain. We suggest the phenomenological expression of maximum stress as a function of the radius of gyration, the number of entanglements, and polydispersity.

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A temperature/strain-rate-dependent finite deformation constitutive and failure model for solid propellants

Lei,

Chen,

Zhao

et al. 2023

Sci. China Phys. Mech. Astron.

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Unravelling physical origin of the Bauschinger effect in glassy polymers

Cited by 11 publications

References 64 publications

Influence of Size and H-bonding on the Elasto-Plastic Mechanical Behavior of PVP–TA Nanofibers

Influence of Size and H-bonding on the Elasto-Plastic Mechanical Behavior of PVP–TA Nanofibers

Coarse-grained molecular dynamics simulation on strain-hardening and fracture behaviors of polycarbonate: Effect of polydispersity and spatial distribution

A temperature/strain-rate-dependent finite deformation constitutive and failure model for solid propellants

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