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Segmental and secondary dynamics of nanoparticle-grafted oligomers

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Abstract

The local segmental and secondary dynamics of tetramethylene oxide oligomer grafted to silica nanoparticles (NPs) were investigated as a function of grafting density and molecular weight. Grafting slows the segmental (α) dynamics, but gives rise to faster secondary (β) motions. Interestingly, the magnitude of these effects decreases with the extent of grafting (i.e., surface coverage), as well as with oligomer molecular weight. The disparity in dynamical effects reflects the decoupling of the segmental and more local β dynamics, the former is associated with stronger dynamic correlations that extend over a greater spatial range. This results in greater sensitivity to interactions, including tethering of the chains to the NP surface.

Graphical abstract: Segmental and secondary dynamics of nanoparticle-grafted oligomers

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Publication details

The article was received on 13 Jul 2018, accepted on 07 Oct 2018 and first published on 09 Oct 2018


Article type: Paper
DOI: 10.1039/C8SM01443D
Citation: Soft Matter, 2018, Advance Article
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    Segmental and secondary dynamics of nanoparticle-grafted oligomers

    A. P. Holt and C. M. Roland, Soft Matter, 2018, Advance Article , DOI: 10.1039/C8SM01443D

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