Effect of Microstructure on Rheological Behavior of Linear- and Branched-Polyethylene

Document Type : compile

Authors

1 Iran polymer and petrochemical institute

2 Academic staff of engineering faculty of Iran Polymer and Petrochemical Institute

3 Amirkabir University of Technology

4 Institute for Advanced Studies in Basic Sciences (IASBS), P.O. Box 45137-66731, Zanjan, Iran

Abstract

In recent decades, the microstructure of polymers and the engineering of their molecular structure are of great interest due to their tremendous effects on the final properties of polymers. With the increase in the demand for the use of polymers, the introduction of new polymers using changes in microstructure and as a result, improved properties have become particularly important. Polyethylene, as a commercial and widely used resin in the industry, has a diverse molecular structure, and as a result, it has various viscoelastic, mechanical, thermal, and processing properties. Investigating the effect of microstructure on the viscoelastic response of polyethylenes can provide a very good prediction of processing behavior and related issues; which makes it possible for engineers to achieve the desired goal by spending less time and energy. The presence of long chain branches in the structure of polyethylene generally improves the melt strength and melt elasticity. So far, various methods have been presented to control the molecular architecture of different polyethylenes, the most important of which are polymerization and the use of specific catalysts, high-energy radiation, and reactive melt modification. The purpose of this review article is to express the effect of the microstructure of linear- and branched-polyethylenes on the rheological properties and to review the research performed in this field.

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Basparesh

Articles in Press, Accepted Manuscript
Available Online from 16 October 2023

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