Plastic deformation of polyethylene crystals as a function of crystal thickness and compression rate

Kaźmierczak, T.; Gałęski, Andrzej; Argon, A. S.

doi:10.1016/j.polymer.2005.06.073

Cited by 97 publications

(98 citation statements)

References 26 publications

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“…Experimentally available measurements of yield strength for PE range between 9.6 and 33.0 MPa at room temperature. 48 However, these measurements are invariably for semicrystalline PE, in which the yield is predominantly due to crystallographic slip along the {100}AE001ae slip system, 49 which is activated at lower stress rather than yield within the amorphous component. Thus, our results are not necessarily inconsistent with the experimental data.…”

Section: Resultsmentioning

confidence: 99%

Mechanical Properties of Glassy Polyethylene Nanofibers via Molecular Dynamics Simulations

2009

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The extent to which the intrinsic mechanical properties of polymer fibers depend on physical size has been a matter of dispute that is relevant to most nanofiber applications. Here, we report the elastic and plastic properties determined from molecular dynamics simulations of amorphous, glassy polymer nanofibers with diameter ranging from 3.7 to 17.7 nm. We find that, for a given temperature, the Young's elastic modulus E decreases with fiber radius and can be as much as 52% lower than that of the corresponding bulk material. Poisson's ratio ν of the polymer comprising these nanofibers was found to decrease from a value of 0.3 to 0.1 with decreasing fiber radius. Our findings also indicate that a small but finite stress exists on the simulated nanofibers prior to elongation, attributable to surface tension. When strained uniaxially up to a tensile strain of ε = 0.2 over the range of strain rates and temperatures considered, the nanofibers exhibit a yield stress σ y between 40 and 72 MPa, which is not strongly dependent on fiber radius; this yield stress is approximately half that of the same polyethylene simulated in the amorphous bulk.

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Section: Resultsmentioning

confidence: 99%

Mechanical Properties of Glassy Polyethylene Nanofibers via Molecular Dynamics Simulations

2009

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“…It is known that in the range of typical thickness of crystals (i.e. for polyethylene in the range of 3e40 nm [43,44]) the value of the yield stress decreases along with decrease of crystals thickness. Therefore, the question arises whether the thickness of polypropylene crystals or degree of 1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27 28 29 30 31 32 33 34 35 36 37 38 39 40 41 42 43 44 45 46 47 48 49 50 51 52 53 54 55 56 57 58 59 60 61 62 63 64crystallinity has changed (decreased) as a result of introducing molecules of modifier into the amorphous phase regions.…”

Section: Analysis Of Polypropylene/modifier Systemsmentioning

confidence: 99%

Physical state of the amorphous phase of polypropylene-influence on thermo-mechanical properties

Krajenta

Różański

2015

Polymer

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“…This process is initiated at the critical resolved shear stress exerted to the easiest slip system [1][2][3][4]. The slip resistance is strongly dependent of crystallite thickness [38][39][40][41][42]. In particular, in orthorhombic crystals of high-density polyethylene (HDPE), the easiest slip occurs in the plane (100) along the chain direction [001] (c-axis).…”

Section: Mechanisms Of Plastic Deformationmentioning

confidence: 99%

Structural mechanics of semicrystalline polymers prior to the yield point: a review

Патлажан

Rémond

2012

J Mater Sci

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The review focuses on the current studies of the deformation response and accompanying structural transformations of thermoplastic semicrystalline polymers subjected to uniaxial tension prior to the yield point. The mechanisms of strain-induced cavitation of amorphous layers and damages of crystalline lamellae are analyzed in line with novel results on the deformation behavior of solid polymers at temperatures exceeding the glass transition point. The coupling of viscoelastic and plastic deformation mechanisms with the small-strain structural transformations is critically discussed on the basis of the advanced theoretical modeling of mechanical properties of semicrystalline polymers.

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Plastic deformation of polyethylene crystals as a function of crystal thickness and compression rate

Cited by 97 publications

References 26 publications

Mechanical Properties of Glassy Polyethylene Nanofibers via Molecular Dynamics Simulations

Mechanical Properties of Glassy Polyethylene Nanofibers via Molecular Dynamics Simulations

Physical state of the amorphous phase of polypropylene-influence on thermo-mechanical properties

Structural mechanics of semicrystalline polymers prior to the yield point: a review

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