Modulating interfacial attraction of polymer-grafted nanoparticles in melts under shear

Erkan Senses, Yang Jiao, Pinar Akcora

Research output: Contribution to journalArticlepeer-review

19 Scopus citations

Abstract

The mechanical properties of polymer nanocomposites are significantly affected by spatial ordering of nanoparticles (NPs) which can be modified under shear flow fields. Polymer-grafted iron oxide NPs form strings, well-dispersed, and percolated anisotropic nanostructures depending on grafting density, and herein their mechanical properties under large oscillatory shear flows are reported. We show that flow-induced alignment of NPs is achieved with string-like structures at low particle loadings (5 wt%). Further, entropic surface tension between grafted and free chains decreases by facilitating the penetration of long matrix chains into the grafts with oscillatory shear flow. Consequently, the degree of entanglements at large strain amplitudes is enhanced which is reflected in elastic properties. These results indicate that the matrix polymer plays an effective role in the reinforcement of polymer-grafted NPs under large shear flow fields.

Original languageEnglish
Pages (from-to)4464-4470
Number of pages7
JournalSoft Matter
Volume10
Issue number25
DOIs
StatePublished - 7 Jul 2014

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