Nanoparticle effect on the dynamics of polymer chains and their entanglement network

Ying Li, Martin Kröger, Wing Kam Liu*

*Corresponding author for this work

Research output: Contribution to journalArticlepeer-review

129 Scopus citations

Abstract

We explore the dynamics of entangled polymer chains embedded into nanocomposites. From primitive path analysis, highly entangled polymer chains are found to be significantly disentangled during increment of the volume fraction of spherical nonattractive nanoparticles (NPs) from 0 to 42%. A critical volume fraction, =31%, is found to control the crossover from polymer chain entanglements to "NP entanglements." While below , the polymer chain relaxation accelerates upon filling, above , the situation reverses: polymer dynamics becomes geometrically constrained upon adding NPs. Our findings provide a microscopic understanding of the dynamics of entangled polymer chains inside their composites, and offer an explanation for the unusual rheological properties of polymer composites.

Original languageEnglish (US)
Article number118001
JournalPhysical review letters
Volume109
Issue number11
DOIs
StatePublished - Sep 13 2012

ASJC Scopus subject areas

  • Physics and Astronomy(all)

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