THE NON-LINEAR AND TIME-DEPENDENT RHEOLOGICAL CHARACTERISTIC FOR A LDPE MELT AND ITS DESCRIPTION

HUANG Shuxin; LU Chuanjing

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THE NON-LINEAR AND TIME-DEPENDENT RHEOLOGICAL CHARACTERISTIC FOR A LDPE MELT AND ITS DESCRIPTION

Research Article | 更新时间：2021-03-19

- THE NON-LINEAR AND TIME-DEPENDENT RHEOLOGICAL CHARACTERISTIC FOR A LDPE MELT AND ITS DESCRIPTION
- Acta Polymerica Sinica Issue 3, Pages: 339-344(2004)
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- Published：20 June 2004，
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HUANG Shuxin, LU Chuanjing. THE NON-LINEAR AND TIME-DEPENDENT RHEOLOGICAL CHARACTERISTIC FOR A LDPE MELT AND ITS DESCRIPTION. [J]. Acta Polymerica Sinica (3):339-344(2004)
DOI：

HUANG Shuxin, LU Chuanjing. THE NON-LINEAR AND TIME-DEPENDENT RHEOLOGICAL CHARACTERISTIC FOR A LDPE MELT AND ITS DESCRIPTION. [J]. Acta Polymerica Sinica (3):339-344(2004) DOI：

摘要

进行了一种低密度聚乙烯 (LDPE

PE-FSB-23D022/Q200)熔体的触变环实验

实验结果表明该LDPE的粘弹力学特性具有复杂的非线性依时特性 ;进一步的应力增长实验表明在定常剪切速率 5s-1下应力会随着剪切时间的延长而明显下降 .文中用一个变型的Huang方程表征了实验得到的触变环

模型计算与各实验结果基本吻合 ;但同时注意到模型的参数不具有通用性

没有全面反映LDPE(Q200)熔体的粘弹力学特性

此外

变型Huang方程也无法预测材料在剪切之后的应力松弛.

Abstract

The thixotropic experiments were carried out for a LDPE (PE-FSB-23DO22/Q200) melt．The results show that the LDPE melt has complex time-dependent viscoelastic properties. The stress geowth experiments show further that the shear stresS will descend with the development of time at a constant shear rate of 5 s-1．A transformation of Huang equation was used to describe the thixotropy loop

and the calculated values agree well with the experiment results．At the same time

it is noted that the parameters of the transformed Huang equation m not universal and cannot be used to characterize completely the viscoelastic properties of the LDPE melt．The stress relaxation after cessation of steady shear cannot be described by the transformed Huang equation．

关键词

LDPE（Q200）瞬态剪切实验粘弹性触变性数学表征

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