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Petr Slobodian,Vladimír Pavlínek,Aneźka Lengálová,Petr Sáha 한국물리학회 2009 Current Applied Physics Vol.9 No.1
Polystyrene and polystyrene/multi-wall carbon nanotube composites, PS/MWNT, with MWNT content up to 1 wt.% were prepared in the form of microspheres through in situ suspension polymerization. The morphology of the fraction of 32–64 lm was examined by SEM and TEM microscopy. On the surface of the spheres the presence of MWNT was not observed. The microspheres intersections showed the structure of aggregates of sintered beads a few micrometers in size with heterogeneous interface. No MWNT material was observed inside the beads; it seemed to be situated in the heterogeneous phase of microspheres. Suspensions of PS/MWNT in silicone oil show electrorheological effect, whose intensity strongly depends on MWNT content in composite microspheres. Polystyrene and polystyrene/multi-wall carbon nanotube composites, PS/MWNT, with MWNT content up to 1 wt.% were prepared in the form of microspheres through in situ suspension polymerization. The morphology of the fraction of 32–64 lm was examined by SEM and TEM microscopy. On the surface of the spheres the presence of MWNT was not observed. The microspheres intersections showed the structure of aggregates of sintered beads a few micrometers in size with heterogeneous interface. No MWNT material was observed inside the beads; it seemed to be situated in the heterogeneous phase of microspheres. Suspensions of PS/MWNT in silicone oil show electrorheological effect, whose intensity strongly depends on MWNT content in composite microspheres.
Miroslav Mrlík,Markéta Ilčíková,Tomáš Plachý,Robert Moučka,Vladimír Pavlínek,Jaroslav Mosnáček 한국공업화학회 2018 Journal of Industrial and Engineering Chemistry Vol.57 No.-
This article is focused on the controllable reduction of the graphene oxide (GO) particles as asimultaneous process during surface initiated atom transfer radical polymerization (SI-ATRP) providinghybrid particles with tailored conductivity and substantial polymer shell on the particles tunable by SIATRPconditions. The main advantage of such approach is that both the compatibility improvement, dueto the polymer layer, and conductivity tuning, due to partial GO reduction, were simply achieved insingle-step reaction providing electrorheological (ER) system with enhanced performance in comparisonto either neat GO or similar non-covalently bonded GO-polymer hybrids. The presence of the poly(glycidyl methacrylate) (PGMA) on the surface of GO was investigated using FTIR spectrometry,transmission electron microscopy and thermogravimetric analysis and their chain length (Mw) andpolydispersity index (PDI) were determined by 1H NMR and GPC, respectively. Two different GO-PGMAparticle systems varied in Mw and PDI and also in electrical conductivities were prepared and theirelectro-responsive capabilities were investigated. The reduction of GO particles was confirmed by Ramanshift as well as conductivity measurements. Electrorheological (ER) performance was investigated atvarious electricfield strengths and repeatability of the phenomenon was confirmed by 10 on/offfieldcycles. Finally, with the help of dielectric measurements of GO-PGMA based ER suspensions,fitted byHavriliak–Negami model, the relaxation processes were properly investigated and the results werecorrelated with those obtained from electrorheological measurements.