A new look at extensional rheology of low-density polyethylene

Huang, Qian; Mangnus, Marc; Alvarez, Nicolas J.; Koopmans, R. J.; Hassager, Ole

doi:10.1007/s00397-016-0921-z

Cited by 55 publications

(37 citation statements)

References 22 publications

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“…To measure the mechanical response of the samples under an extensional deformation flow field, a VADER 1000 (versatile accurate deformation extensional rheometer) from Rheo Filament ApS Huang et al (2016a) is used. The sample is loaded between two vertically aligned cylindrical stainless steel plates of identical diameters (6 mm or 9 mm).…”

Section: Extensional Rheology Coupled To Imagingmentioning

confidence: 99%

Brittle fracture of polymer transient networks

Arora

Shabbir²,

Hassager³

et al. 2017

Journal of Rheology

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SynopsisWe study the fracture of reversible double transient networks, constituted of water suspensions of entangled surfactant wormlike micelles reversibly linked by various amounts of telechelic polymers. We provide a state diagram that delineates the regime of fracture without necking of the filament from the regime where no fracture or break-up has been observed. We show that filaments fracture when stretched at a rate larger than the inverse of the slowest relaxation time of the networks. We quantitatively demonstrate that dissipation processes are not relevant in our experimental conditions and that, depending on the density of nodes in the networks, fracture occurs in the linear viscoelastic regime or in a non-linear regime. In addition, analysis of the crack opening profiles indicates deviations from a parabolic shape close to the crack tip for weakly connected networks. We demonstrate a direct correlation between the amplitude of the deviation from the parabolic shape and the amount of non linear viscoelasticity.

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Section: Extensional Rheology Coupled To Imagingmentioning

confidence: 99%

Brittle fracture of polymer transient networks

Arora

Shabbir²,

Hassager³

et al. 2017

Journal of Rheology

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“…Progress on the experimental side has recently been made by the seminal work of Huang et al [21] and Huang and Hassager [22] on well characterized monodisperse polystyrenes (PSs) dispersed in oligomeric styrene (OS) via VADER 1000, Rheo Filament ApS, a commercially available filament stretching rheometer [23]. By measuring the local diameter of the polymer sample during elongation, the true Hencky strain and strain rate can be determined, while from the global deformation of the sample, only nominal values of strain and strain rate can be obtained.…”

Section: Introductionmentioning

confidence: 99%

On the origin of brittle fracture of entangled polymer solutions and melts

Wagner

Narimissa

Huang

2018

Journal of Rheology

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“…For example, low-density polyethylenes (LDPEs) are long-chain branched polymers. Although theoretical predictions of the nonlinear rheology for LDPEs have shown some success [15,16], the models are quantitatively weak in predicting experimental observations at large deformation in fast extensional flow [17,18]. The underlying mechanism governing the nonlinear response of branched polymers is still unclear due to the lack of experimental data and for the case of LDPE due to its complex random branched structure.…”

Section: Introductionmentioning

confidence: 99%

Dynamics of Star Polymers in Fast Extensional Flow and Stress Relaxation

et al. 2016

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In the present work, we confirm the observation from Ianniruberto and Marrucci [1] that entangled melts of branched polystyrenes behave like linear polystyrenes in the steady state of fast extensional flow, by measuring a linear, an asymmetric star and a symmetric star polystyrenes with the same span molecular weight (180 kg/mol). We show that all three melts reach the same extensional steady-state viscosity in fast extensional flow (faster than the inverse Rouse time). We further measure stress relaxation following steady extensional flow for the three melts. We show that initially they relax in a similar way, most likely via arm retraction, at short time, but behave differently at long time due to both the length of the arm and the branch point. The terminal relaxation is described by a Doi and Edwards based model, i.e. considering pure orientational relaxation.

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A new look at extensional rheology of low-density polyethylene

Cited by 55 publications

References 22 publications

Brittle fracture of polymer transient networks

Brittle fracture of polymer transient networks

On the origin of brittle fracture of entangled polymer solutions and melts

Dynamics of Star Polymers in Fast Extensional Flow and Stress Relaxation

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