Shear Modification of Long Chain Branched Polymers: A Theoretical Approach Using the Pom-Pom Model, 2003 European PLACE Conference Proceedings

"Shear modification" is a strong modification of rheological properties which affects mainly long chain branched polymers like LDPE. Our work is a tentative explanation of this effect using recent advances in molecular dynamics and especially the pom-pom model. Our theoretical approach shows that when arm retraction is significant, the whole relaxation timescale is modified inducing a very different rheological behaviour in shear and in elongation. Results are in qualitative agreement with reported experimental results. Eventually, it will be of highest importance from an industrial point of view to study an effective way to control this "flow modification" in order to get a powerful tool to control the material properties during the process and to achieve higher processability and performances.

Author: Bourrigaud, S., Marin, G.
Shear Modification of Long Chain Branched Polymers: A Theore
Shear Modification of Long Chain Branched Polymers: A Theoretical Approach Using the Pom-Pom Model, 2003 European PLACE Conference Proceedings
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