Quantitative relation between shear history and rheological properties of LDPE

Document Type

Article

Publication Date

12-1-2001

Abstract

The role of the applied processing equipment shear history on the rheological properties of low-density polyethylene was studied in detail. It was found that the shear history depresses the melt strength and the oscillatory shear modulus, especially the storage modulus in low frequency region. This phenomenon is not caused by lowering of the molecular weight, which remained the same as the original, for all shear history samples, indicating absence of mechanical/thermal degradation during processing. Furthermore, annealing the melt processed samples enhances both the melt strength and the oscillatory modulus to the values of the original, unsheared sample. Finally we applied shear history in a cone-and-plate rheometer and found that the growth curve of the storage modulus, which can be expressed by a simple equation, is determined by both the duration of the flow and the magnitude of the applied shear stress.

Identifier

0035576672 (Scopus)

Publication Title

Advances in Polymer Technology

External Full Text Location

https://doi.org/10.1002/adv.10002

ISSN

07306679

First Page

261

Last Page

269

Issue

4

Volume

20

This document is currently not available here.

Share

COinS