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 their molecular structure engineering are of great interest due to their tremendous effects on the final properties of polymers. With the increasing demand of polymers, introducing new types of them by changing the microstructure and as a result improving the properties has become particularly important. Polyethylene is a commercial and widely used resin in the industry, which has a diverse molecular structure and consequently, 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 the processing behavior and related issues; which makes it possible for engineers to achieve the desired goal by spending less time and energy. In general, the presence of long chain branches in the structure of polyethylene improves the melt strength and 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. In this article, the microstructure effect of linear- and branched-polyethylenes on the rheological properties and the research performed in this field are reviewed.

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