Enhanced and Tunable Electrorheological Capability using Surface Initiated Atom Transfer Radical Polymerization Modification with Simultaneous Reduction of the Graphene Oxide by Silyl-Based Polymer Grafting

Nanomaterials
Erika KutalkovaJaroslav Mosnacek

Abstract

In this study, a verified process of the "grafting from" approach using surface initiated atom transfer radical polymerization was applied for the modification of a graphene oxide (GO) surface. This approach provides simultaneous grafting of poly(2-(trimethylsilyloxy)ethyl methacrylate) (PHEMATMS) chains and a controllable reduction of the GO surface. This allows the fine tuning of its electrical conductivity, which is a crucial parameter for applications of such hybrid composite particles in electrorheological (ER) suspensions. The successful coating was confirmed by transmission electron microscopy and Fourier-transform infrared spectroscopy. The molecular characteristics of PHEMATMS were characterized by gel permeation chromatography. ER performance was elucidated using a rotational rheometer under various electric field strengths and a dielectric spectroscopy to demonstrate the direct impact of both the relaxation time and dielectric relaxation strength on the ER effectivity. Enhanced compatibility between the silicone oil and polymer-modified GO particles was investigated using contact angle measurements and visual sedimentation stability determination. It was clearly proven that the modification of the GO surface improved...Continue Reading

References

Apr 28, 2006·The Journal of Physical Chemistry. B·Hannes C SchnieppIlhan A Aksay
Dec 22, 2009·Chemical Society Reviews·Daniel R DreyerRodney S Ruoff
Jun 26, 2010·Chemical Communications : Chem Comm·Wen Ling ZhangHyoung Jin Choi
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Apr 6, 2012·ACS Applied Materials & Interfaces·Wen Ling ZhangSang Guk Kim
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Methods Mentioned

BETA
nuclear magnetic resonance
dielectric spectroscopy
NMR

Software Mentioned

MultiPak
PHEMATMS

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