Rheological properties of some polyolefine melts in transient uniaxial elongational flow, described with a special type of constitutive equation

Leblans, Paul J. R.; Sampers, Jacques; Booij, H. C.

doi:10.1016/0377-0257(85)85004-7

Cited by 13 publications

(9 citation statements)

References 23 publications

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“…The theological properties in simple elongational flow of two low-density polyethylene (LDPE) melts also appear to be consistent with this type of constitutive equation [6,7]. This means that three material-specific functions, viz.…”

Section: Introductionmentioning

confidence: 71%

“…A summary of further evidence on other materials is given by Chang et al [11]. This separability also applies to a large class of polymer solutions and melts [1][2][3][4][5][6][7]. Eq.…”

Section: The Factorable Single Integral Constitutive Equationmentioning

confidence: 91%

“…Step-strain stress relaxation measurements have frequently been used to determine $12 (7) and Se(e) [1-5, 7, 15-17]. Other types of experiment can also be performed to obtain the strain measures for polymer melts.…”

Section: The Factorable Single Integral Constitutive Equationmentioning

confidence: 99%

“…Other types of experiment can also be performed to obtain the strain measures for polymer melts. The measurements performed to determine the strain measures for the LDPE melt under investigation (STAMYLAN ® 2800) are: step-strain stress relaxation, stress build-up under constant shear rate and stress relaxation from the steady-state for $12 (7) [5] and stepstrain stress relaxation, stress build-up at constant Hencky strain rate, creep under constant tensile stress and constant tensile velocity experiments [5,7] for…”

Section: The Factorable Single Integral Constitutive Equationmentioning

confidence: 99%

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Nonlinear viscoelasticity of polymer melts in different types of flow

Leblans

1987

Rheol Acta

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Abstract:The nonlinear viscoelastic properties of a fairly large class of polymeric fluids can be described with the factorable single integral constitutive equation. For this class of fluids, a connection between the rheological behaviour in different flow geometries can be defined if the strain tensor (or the damping function) is expressed as a function of the invariants of a tensor which describes the macroscopic strain, such as the Finger tensor. A number of these expressions, proposed in the literature, are tested on the basis of the measuring data for a low-density polyethylene melt. In the factorable BKZ constitutive equation the strain-energy function must be expressed as a function of the invariants of the Finger tensor. The paper demonstrates that the strain-energy function can be calculated from the simple shear and simple elongation strain measures, if it is assumed to be of the shape proposed by Valanis and Landel. The measuring data for the LDPE melt indicate that the Valanis-Landel hypothesis concerning the shape of the strainenergy function is probably not valid for polymer melts.

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Section: Introductionmentioning

confidence: 71%

“…A summary of further evidence on other materials is given by Chang et al [11]. This separability also applies to a large class of polymer solutions and melts [1][2][3][4][5][6][7]. Eq.…”

Section: The Factorable Single Integral Constitutive Equationmentioning

confidence: 91%

Section: The Factorable Single Integral Constitutive Equationmentioning

confidence: 99%

Section: The Factorable Single Integral Constitutive Equationmentioning

confidence: 99%

See 2 more Smart Citations

Nonlinear viscoelasticity of polymer melts in different types of flow

Leblans

1987

Rheol Acta

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“…Key Words: High density polyethylene / Highly entangled melt / Damping function / Uniaxial deformation / Stress relaxation in uniaxial deformation are only a few. Noordemeer and Ferry 14) measured the relaxation modulus of polybutadiene after stepstrain in uniaxial elongation, and Lablens et al, 16) and Barroso and Maina 17) have also measured the relaxation mudulus in uniaxial elongation. An indirect method is often employed to estimate the damping function in uniaxial elongation, where the operation is made at constant strain rates and then the obtained data are converted by using the stress growth coefficients, 5,7,18) and these results show that the damping function for the modelately entangled systems with narrow MWD agrees well with the DE prediction.…”

Section: Introductionmentioning

confidence: 99%

Damping Behavior of Highly Entangled High Density Polyethylene after Uniaxial Step Strains

Kabeya

Yoshikawa

Horinaka

et al. 2015

J. Soc. Rheol., Jpn

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Linear low density polyethylenes and their blends: Part 3. Extensional flow of LLDPE's

Schlund

Utracki

1987

Polymer Engineering & Sci

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The uniaxial extensional flow at 150°C of 11 linear low density polyethylenes (LLDPE) and one low density polyethylene was measured in a Rheometrics Extensional Rheometer. The presence of silicone oil did not affect the results. However, large effects of the molding time were observed. For specimens molded for 14 min, strain hardening was not observed for any gas‐phase polymerized LLDPE. As the molding time was increased to 40 min, the strain hardening was quite apparent, the elongational viscosity nearly doubled, the equilibrium plateau vanished, and the maximum strain at break Increased by about 20 percent. Explanation for the molding time effects can be found in the concept of low entanglement density in the virgin gas‐phase resins. The entanglement increases with time at temperatures above the melting point. The specimens molded for longer time show strain hardening.

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Rheological properties of some polyolefine melts in transient uniaxial elongational flow, described with a special type of constitutive equation

Cited by 13 publications

References 23 publications

Nonlinear viscoelasticity of polymer melts in different types of flow

Nonlinear viscoelasticity of polymer melts in different types of flow

Damping Behavior of Highly Entangled High Density Polyethylene after Uniaxial Step Strains

Linear low density polyethylenes and their blends: Part 3. Extensional flow of LLDPE's

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