Network dynamics in nanofilled polymers

Guilhem P. Baeza, Claudia Dessi, Salvatore Costanzo, Dan Zhao, Shushan Gong, Angel Alegria, Ralph H. Colby, Michael Rubinstein, Dimitris Vlassopoulos, Sanat K. Kumar

Research output: Contribution to journalArticle

55 Citations (Scopus)

Abstract

It is well accepted that adding nanoparticles (NPs) to polymer melts can result in significant property improvements. Here we focus on the causes of mechanical reinforcement and present rheological measurements on favourably interacting mixtures of spherical silica NPs and poly(2-vinylpyridine), complemented by several dynamic and structural probes. While the system dynamics are polymer-like with increased friction for low silica loadings, they turn network-like when the mean face-to-face separation between NPs becomes smaller than the entanglement tube diameter. Gel-like dynamics with a Williams-Landel-Ferry temperature dependence then result. This dependence turns particle dominated, that is, Arrhenius-like, when the silica loading increases to ~ 31 vol%, namely, when the average nearest distance between NP faces becomes comparable to the polymer's Kuhn length. Our results demonstrate that the flow properties of nanocomposites are complex and can be tuned via changes in filler loading, that is, the character of polymer bridges which 'tie' NPs together into a network.

Original languageEnglish (US)
Article number11368
JournalNature communications
Volume7
DOIs
StatePublished - Apr 25 2016

Fingerprint

Nanoparticles
Polymers
nanoparticles
Silicon Dioxide
polymers
silicon dioxide
Nanocomposites
Friction
Polymer melts
reinforcement
fillers
Fillers
nanocomposites
Reinforcement
Dynamical systems
friction
Gels
gels
tubes
temperature dependence

All Science Journal Classification (ASJC) codes

  • Chemistry(all)
  • Biochemistry, Genetics and Molecular Biology(all)
  • Physics and Astronomy(all)

Cite this

Baeza, G. P., Dessi, C., Costanzo, S., Zhao, D., Gong, S., Alegria, A., ... Kumar, S. K. (2016). Network dynamics in nanofilled polymers. Nature communications, 7, [11368]. https://doi.org/10.1038/ncomms11368
Baeza, Guilhem P. ; Dessi, Claudia ; Costanzo, Salvatore ; Zhao, Dan ; Gong, Shushan ; Alegria, Angel ; Colby, Ralph H. ; Rubinstein, Michael ; Vlassopoulos, Dimitris ; Kumar, Sanat K. / Network dynamics in nanofilled polymers. In: Nature communications. 2016 ; Vol. 7.
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Baeza, GP, Dessi, C, Costanzo, S, Zhao, D, Gong, S, Alegria, A, Colby, RH, Rubinstein, M, Vlassopoulos, D & Kumar, SK 2016, 'Network dynamics in nanofilled polymers', Nature communications, vol. 7, 11368. https://doi.org/10.1038/ncomms11368

Network dynamics in nanofilled polymers. / Baeza, Guilhem P.; Dessi, Claudia; Costanzo, Salvatore; Zhao, Dan; Gong, Shushan; Alegria, Angel; Colby, Ralph H.; Rubinstein, Michael; Vlassopoulos, Dimitris; Kumar, Sanat K.

In: Nature communications, Vol. 7, 11368, 25.04.2016.

Research output: Contribution to journalArticle

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Baeza GP, Dessi C, Costanzo S, Zhao D, Gong S, Alegria A et al. Network dynamics in nanofilled polymers. Nature communications. 2016 Apr 25;7. 11368. https://doi.org/10.1038/ncomms11368