modification of graphene oxide nanosheets via reversible addition-fragmentation chain transfer polymerization (RAFT)

سال انتشار: 1393
نوع سند: مقاله کنفرانسی
زبان: انگلیسی
مشاهده: 359

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شناسه ملی سند علمی:

ICNN05_250

تاریخ نمایه سازی: 30 آبان 1394

چکیده مقاله:

Natural graphite was oxidized via the Hummer's method and sonicated to obtain graphene oxide (GO).A three-step modification process was performed to attach a reversible addition–fragmentation chain transfer (RAFT)-agent onto the GO surface and obtain GO-RAFT nanosheets. RAFT polymerization of 2-hydroxyethyl methacrylate(HEMA) and acrylic acid (AA) was performed by using azobisisobutyronitrile (AIBN) as initiator. Fourier transforminfrared (FTIR), thermogravimetric analysis (TGA) and etc, were used to characterize the structure of modifiednanosheets. These modified nanosheets showed dual pH- and thermo-sensitive properties as measured by UV-visiblespectroscopy. Due to the dark nature of GO-P(HEMA) and GO-P(HEMA-co-AA) nanosheets, the UV-visible absorptionof their solutions is an effective parameter to examine the stimuli responsive behavior as measured here at different pH(3–12) and temperature (25–55 ºC) values. According to the results, UV-visible absorption of GO-P(HEMA) decreasesslightly as pH decreases while the decrease is more significant for GO-P(HEMA-co-AA). Also, a lower critical solutiontemperature (LCST) of 30 and 34 ºC is observed for GO-P(HEMA) and GO-P(HEMA-co-AA) nanosheets respectively.

نویسندگان

M Nikdel

Department of Polymer Engineering, Sahand University Of Technology, Tabriz, Iran

M Salami-Kalajahi

Department of Polymer Engineering, Sahand University Of Technology, Tabriz, Iran

M Salami-Kalajahi

Department of Polymer Engineering, Sahand University Of Technology, Tabriz, Iran