Uniaxial extension of linear flexible-chain polymers in an extremely broad range of stresses and strain rates

Vinogradov, G. V.; Dreval, V. E.; Borisenkova, E. K.; Kurbanaliev, M. K.; Shalganova, V. G.

doi:10.1007/bf01503264

Cited by 27 publications

(18 citation statements)

References 15 publications

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“…It has been observed that there is a maximum in the strength corresponding to the maximum of fracture strain versus strain rate [5]. The relevant data indicate that for such vitrified amorphous polymers only strengths up to 100 MPa can be obtained.…”

Section: The Relaxation Transitions In Linear Polymers In Uniaxial Exmentioning

confidence: 96%

“…These values considerably exceed recoverable fracture strains for crosslinked rubbers. The analysis of the results for 1,2-polybutadiene and a number of other polymers leads to an important conclusion that the maximum of the e* (8) curve corresponds to the limiting degree of straightening of the macromolecules [5,18,19]. The pertinent data are presented in figure 9.…”

Section: The Relaxation Transitions In Linear Polymers In Uniaxial Exmentioning

confidence: 97%

“…Dependence of total (e*), recoverable (e*) and non-recoverable (e~.) deformatiotas on strain rate fracture can be studied over many decades of extension rates and stresses, and the strength characteristics can be determined over a very wide range of deformation rates, in particular, for the transition from the rubbery to leathery states [5,18]. In uniaxial extension two limiting modes of polymer behaviour can be seen especially clearly: steady-state flow and polymer fracture (figure 8).…”

Section: The Relaxation Transitions In Linear Polymers In Uniaxial Exmentioning

confidence: 99%

“…This is important since it allows prediction of the limiting conditions for the processing of polymers on the basis of non-destructive tests [5].…”

Section: Introductionmentioning

confidence: 99%

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Uniaxial extension and shear in combination with cyclic straining as a promising method for studying the viscoelasticity of polymers over a wide range of stresses and strains atT > T g

1985

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Simple relations are found between the fracture strains, the long-term durability and the initial values of parameters characterizing polymer rheology at deformation rates and stresses approaching zero. Fracture regimes are determined by two groups of parameters. One includes critical values of stresses. They are invariant with repect to temperature and molecular weight of the polymers; the values of critical stresses for different polymer compositions differ by a factor of 10 to 20. The second group of critical parameters includes the rates of deformation determined by the initial viscosity. The latter may vary by many orders of magnitude. There exists a universal critical value determining polymer fracture independent of linear macromolecule composition, its molecular weight, the temperature and the way of attaining a given state. This value is the recoverable strain and is equal to 0.5 according to Hencky. There exists a relation between the maximum value of recoverable strain in the transition region from the rubbery to the leathery state and the extensibility of macromolecules for polymers with various molecular weights. Quenching of the polymer near the maximum recoverable strain makes it possible to obtain high strength samples. Overspurt regimes for polymer flow have also been studied. It has been shown that this causes polymer static electrification. Simple and unique dependences of the charge density on temperature and polymer molecular weight have been established.

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Section: The Relaxation Transitions In Linear Polymers In Uniaxial Exmentioning

confidence: 96%

Section: The Relaxation Transitions In Linear Polymers In Uniaxial Exmentioning

confidence: 97%

Section: The Relaxation Transitions In Linear Polymers In Uniaxial Exmentioning

confidence: 99%

“…This is important since it allows prediction of the limiting conditions for the processing of polymers on the basis of non-destructive tests [5].…”

Section: Introductionmentioning

confidence: 99%

See 2 more Smart Citations

Uniaxial extension and shear in combination with cyclic straining as a promising method for studying the viscoelasticity of polymers over a wide range of stresses and strains atT > T g

1985

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“…In papers [1][2][3] the hypothesis has been proposed that as a result of deformative orientation caused by substantial elastic strains occurring i'n deformed viscoelastic liquids these liquids lose their fluidity and behave like purely elastic bodies. Based on this idea the present paper deals with a theoretical and experimental study of phenomena such as (i) the withdrawal of a jet of viscoelastic liquid from a reservoir having a free liquid surface and (ii) an open-channel siphon.…”

Section: Introductionmentioning

confidence: 99%

A model of elastic deformation for the description of withdrawal of polymer solutions

Prokunin

1983

Rheol Acta

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Based on the hypothesis of fluidity loss, which arises as a result of deformative orientation developing in polymer liquids at large elastic strains, the problem of the withdrawal of polymer solutions from a reservoir with a free liquid surface as well as the open-channel siphon problem have been treated theoretically. The assumption is made that after fluidity loss occurs the polymer solution deforms like a highly elastic cross-linked rubber. A quantitative comparison between the theoretical results and some experiments is also given.

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Strain Hardening in Extension

2017

Nonlinear Polymer Rheology

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Uniaxial extension of linear flexible-chain polymers in an extremely broad range of stresses and strain rates

Cited by 27 publications

References 15 publications

Uniaxial extension and shear in combination with cyclic straining as a promising method for studying the viscoelasticity of polymers over a wide range of stresses and strains atT > T g

Uniaxial extension and shear in combination with cyclic straining as a promising method for studying the viscoelasticity of polymers over a wide range of stresses and strains atT > T g

A model of elastic deformation for the description of withdrawal of polymer solutions

Strain Hardening in Extension

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