Viscoelastic Property of an LDPE Melt in Triangular- and Trapezoidal-Loop Shear Experiment

The time-dependent viscoelastic behaviors of a low-density polyethylene melt (LDPE) in a triangular- and trapezoidal-loop shear experiment reported previously are described here by an integral-type Rivlin–Sawyers (RS) constitutive equation. The linear viscoelasticity of the melt was obtained through...

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Autor principal:	Shuxin Huang
Formato:	article
Lenguaje:	EN
Publicado:	MDPI AG 2021
Materias:	LDPE triangular-loop shear trapezoidal-loop shear time-dependent viscoelastic property Rivlin–Sawyers equation Organic chemistry QD241-441
Acceso en línea:	https://doaj.org/article/4fef5698ca5844edae28d9e47154e32e
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spelling	oai:doaj.org-article:4fef5698ca5844edae28d9e47154e32e2021-11-25T18:49:14ZViscoelastic Property of an LDPE Melt in Triangular- and Trapezoidal-Loop Shear Experiment10.3390/polym132239972073-4360https://doaj.org/article/4fef5698ca5844edae28d9e47154e32e2021-11-01T00:00:00Zhttps://www.mdpi.com/2073-4360/13/22/3997https://doaj.org/toc/2073-4360The time-dependent viscoelastic behaviors of a low-density polyethylene melt (LDPE) in a triangular- and trapezoidal-loop shear experiment reported previously are described here by an integral-type Rivlin–Sawyers (RS) constitutive equation. The linear viscoelasticity of the melt was obtained through a dynamic frequency sweep experiment at a small strain and fitted by a relaxation spectrum. The nonlinear viscoelasticity was characterized by viscosity. All the experimental viscoelastic behaviors of the melt can be divided into two types in terms of the predictions of the RS model: (1) predictable time-dependent viscoelastic behaviors at low shear rates or during short-term shear, and (2) unpredictable shear weakening behavior occurring at the high shear rate of 3–5 s<sup>−1</sup> during long-term shear with the characteristic time interval of about 40–100 s. The influence of experimental error caused possibly by inhomogeneous samples on the viscoelasticity of the melt was analyzed, and the large relative error in the experiment is about 10–30%.Shuxin HuangMDPI AGarticleLDPEtriangular-loop sheartrapezoidal-loop sheartime-dependent viscoelastic propertyRivlin–Sawyers equationOrganic chemistryQD241-441ENPolymers, Vol 13, Iss 3997, p 3997 (2021)
institution	DOAJ
collection	DOAJ
language	EN
topic	LDPE triangular-loop shear trapezoidal-loop shear time-dependent viscoelastic property Rivlin–Sawyers equation Organic chemistry QD241-441
spellingShingle	LDPE triangular-loop shear trapezoidal-loop shear time-dependent viscoelastic property Rivlin–Sawyers equation Organic chemistry QD241-441 Shuxin Huang Viscoelastic Property of an LDPE Melt in Triangular- and Trapezoidal-Loop Shear Experiment
description	The time-dependent viscoelastic behaviors of a low-density polyethylene melt (LDPE) in a triangular- and trapezoidal-loop shear experiment reported previously are described here by an integral-type Rivlin–Sawyers (RS) constitutive equation. The linear viscoelasticity of the melt was obtained through a dynamic frequency sweep experiment at a small strain and fitted by a relaxation spectrum. The nonlinear viscoelasticity was characterized by viscosity. All the experimental viscoelastic behaviors of the melt can be divided into two types in terms of the predictions of the RS model: (1) predictable time-dependent viscoelastic behaviors at low shear rates or during short-term shear, and (2) unpredictable shear weakening behavior occurring at the high shear rate of 3–5 s<sup>−1</sup> during long-term shear with the characteristic time interval of about 40–100 s. The influence of experimental error caused possibly by inhomogeneous samples on the viscoelasticity of the melt was analyzed, and the large relative error in the experiment is about 10–30%.
format	article
author	Shuxin Huang
author_facet	Shuxin Huang
author_sort	Shuxin Huang
title	Viscoelastic Property of an LDPE Melt in Triangular- and Trapezoidal-Loop Shear Experiment
title_short	Viscoelastic Property of an LDPE Melt in Triangular- and Trapezoidal-Loop Shear Experiment
title_full	Viscoelastic Property of an LDPE Melt in Triangular- and Trapezoidal-Loop Shear Experiment
title_fullStr	Viscoelastic Property of an LDPE Melt in Triangular- and Trapezoidal-Loop Shear Experiment
title_full_unstemmed	Viscoelastic Property of an LDPE Melt in Triangular- and Trapezoidal-Loop Shear Experiment
title_sort	viscoelastic property of an ldpe melt in triangular- and trapezoidal-loop shear experiment
publisher	MDPI AG
publishDate	2021
url	https://doaj.org/article/4fef5698ca5844edae28d9e47154e32e
work_keys_str_mv	AT shuxinhuang viscoelasticpropertyofanldpemeltintriangularandtrapezoidalloopshearexperiment
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Viscoelastic Property of an LDPE Melt in Triangular- and Trapezoidal-Loop Shear Experiment

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