The Nonlinear Time‐Dependent Response of Semicrystalline Polymers: Correlations Between the Configurational Entropy and the Rate of Rearrangement of Chains

Drozdov, Aleksey D.; Christiansen, Jesper de Claville

doi:10.1002/1521-3919(20021101)11:8<884::aid-mats884>3.0.co;2-#

Cited by 5 publications

(3 citation statements)

References 40 publications

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“…Numerous papers deal with the modeling of the tensile test (often only the loading path) of semi-crystalline polymers at high strains [1][2][3][4][5][6][7][8][9][10][11]; however, the modeling of the loading and the unloading paths, even under a small strain, is still not fitted well by existing models. In fact, the behaviour of a semi-crystalline polymer during the unloading path is quite specific, even with small strains: firstly, the slope of the stress-strain diagram at the beginning of the unloading path is significantly smaller than the slope at the beginning of loading; secondly the concavity of the stress-strain curve changes during the unloading path.…”

Section: Introductionmentioning

confidence: 99%

“…The non-linear viscoelastic response of semi-crystalline polymer was studied in the past decade by Drozdov et al [7][8][9], Coulon et al [10], Meyer and Pruitt [11] and Nitta and Takayanagi [12,13]. These authors mentioned the important role of the amorphous phase, in particular the sliding and rearrangement of chains in non-linear viscoelasticity.…”

Section: Introductionmentioning

confidence: 99%

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A non-linear viscoelastic model developed for semi-crystalline polymer deformed at small strains with loading and unloading paths

Laï

Yakimets

Guigon

2005

Materials Science and Engineering: A

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Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

A non-linear viscoelastic model developed for semi-crystalline polymer deformed at small strains with loading and unloading paths

Laï

Yakimets

Guigon

2005

Materials Science and Engineering: A

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“…In semi-crystalline polymers, the type and amount of both amorphous and crystalline phases determine the linear viscoelastic behavior [3]. The non-linear viscoelastic response of semi-crystalline polymers was studied in the past decade by Drozdov et al [12][13][14], Coulon et al [15], Meyer and Pruitt [16], and Nitta and Takayanagi [17,18]. These authors mentioned the important role of the amorphous phase, in particular the sliding and rearrangement of chains in non-linear viscoelasticity.…”

Section: Evaluation Of Linearitymentioning

confidence: 99%

Evaluation of Time Dependent Behavior of a Wood Flour/High Density Polyethylene Composite

Dastoorian

Tajvidi

Ebrahimi

2008

Journal of Reinforced Plastics and Composites

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Short-term flexural creep and stress relaxation tests were conducted on a wood plastic composite containing 30% high density polyethylene (HDPE), 67% fir wood flour, 2% compatibilizer (MAPE), and 1% lubricant. In creep tests, applied stress levels ranged from 30 to 60% of measured flexural strength. The principle of time-stress superposition was applied to form a master curve extending for a maximum of 4 years. The horizontal shift factors conformed to an Arrhenius type equation. Stress relaxation tests were also carried out at strain levels ranging from 30 to 60% of the ultimate strain. The principle of time-strain superposition was applied to form a stress relaxation master curve that extended for 67 days. The horizontal shift factors also conformed to an Arrhenius type equation. The resulting master curves were compared with extrapolated creep and stress relaxation models. To determine whether time-stress superposition is valid for the studied composite material, creep shift factors were applied to stress relaxation data and vice versa. In both creep and stress relaxation tests, it was found that the application of superposition was verified. The results indicated that the studied composite material was rheologically simple, and a single horizontal shifting on time axis was adequate to predict the long term performance of the material.

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The effect of temperature on the viscoelastic response of semicrystalline polymers

Drozdov

Agarwal

Gupta

2004

J of Applied Polymer Sci

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Three series of isothermal torsion relaxation tests were performed at various temperatures ranging from room temperature to T ϭ 120°C on isotactic polypropylene, low-density polyethylene, and linear low-density polyethylene. Constitutive equations are derived for the viscoelastic behavior of a semicrystalline polymer at small strains. A polymer is treated as an equivalent network of strands bridged by temporary junctions (entanglements, physical crosslinks on the surfaces of crystallites, and lamellar blocks). The network is thought of as an ensemble of mesoregions with various activation energies for detachment of active strands from their junctions. The time-dependent response of the ensemble reflects thermally induced rearrangement of strands (separation of active strands from temporary junctions and merging of dangling strands with the network). Stress-strain relations are developed by using the laws of thermodynamics. The governing equations involve five adjustable parameters that are found by fitting the experimental data. This study focuses on the influence of temperature and crystalline morphology of polyolefins on the material parameters in the constitutive relations.

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The Nonlinear Time‐Dependent Response of Semicrystalline Polymers: Correlations Between the Configurational Entropy and the Rate of Rearrangement of Chains

Cited by 5 publications

References 40 publications

A non-linear viscoelastic model developed for semi-crystalline polymer deformed at small strains with loading and unloading paths

A non-linear viscoelastic model developed for semi-crystalline polymer deformed at small strains with loading and unloading paths

Evaluation of Time Dependent Behavior of a Wood Flour/High Density Polyethylene Composite

The effect of temperature on the viscoelastic response of semicrystalline polymers

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