Photoactuators can concern light stimuli in appropriate wavelength into mechanical response. Such reversible changes in the material shape are highly promising in their applications as remote controllers, or safety sensors. In this work we were focused on light-induced actuation and sensing performance of the prepared materials. In this case poly(dimethyl siloxane) PDMS with various amounts of silicone oil and curing agent was used as matrix. Graphene oxide (GO) as filler in its neat form as well as its modified analogue were used in concentration of 0.1 vol. %. Modified GO particles were controllably coated with poly(methyl methacrylate) polymer chains using surface-initiated atom transfer radical polymerization (SI-ATRP) approach in order improve interactions between the filler and matrix which consequently lead to the enhanced light-induced actuation performance. Generally, the both, GO particles as well as modified ones were characterized using FTIR, Raman spectroscopy and finally conductivity measurement to confirm the controllable coating and simultaneously proceeded reduction. By studying of dielectric properties (activation energies), viscoelastic properties, which were investigated using dynamic mechanical analysis, the interactions between the filler and matrix were evaluated with connection to their light-responsive and sensing capabilities.
This study utilize the simple fabrication method for graphene oxide (GO) sheet preparation, their
controllable modification using surface initiated atom transfer radical polymerization (SI-ATRP)
technique and thus suitable interaction with elastomeric matrix for final enhancement and controlling
of the sensing capability upon light stimulus. GO particles and their grafted analogues were
characterized by Fourier transform infrared spectroscopy, Thermogravimetric analysis and Raman
spectroscopy to properly see the controllable coating as well as reduction of GO during the single-step
synthesis. The composites containing various amounts of GO, controllably modified GO and
elastomeric matrix poly(vinylidene-co-hexafluoropropylene) elastomer were characterized by dynamic
mechanical analysis and thermal conductivity. The phenomenon how the GO and modified GO
particles influence the mobility of the polymer chains and thermal conductivity will be investigated.
The impact on change of the material properties with respect to the light-responsive and sensing
capabilities is discussed.
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