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Cuong M.Q. Le,Xuan Thang Cao,정연태,임권택 한국공업화학회 2018 Journal of Industrial and Engineering Chemistry Vol.64 No.-
Imidazolium-based poly(ionic liquid)s grafted on the surface of multiwalled carbon nanotubes (MWNTs) were prepared by Diels–Alder “click” reaction with a high grafting density. Poly(styrene-alt-maleic anhydride) (PSM) was functionalized with furfuryl amine and then it was modified with 1-(3-aminopropyl)-3-methylimidazolium bromide to produce poly(ionic liquid)s functionalized with furfuryl groups (PSMF-ILs). PSMF-ILs were directly grafted onto the surface of MWNTs under ultrasonication to form PSMF-IL/MWNT nanocomposites. The material was characterized by FTIR, Raman spectroscopy, XRD, XPS and TEM analyses. The results showed that a very high grafting density was achieved in deep eutectic solvents based on choline chloride:ethylene glycol in a short time.
Le, Cuong M.Q.,Cao, Xuan Thang,Lim, Kwon Taek Elsevier 2017 Ultrasonics sonochemistry Vol.39 No.-
<P><B>Abstract</B></P> <P>A facile and environmentally friendly strategy for grafting polymers onto the surface of multi-walled carbon nanotubes (CNTs) was demonstrated by Diels-Alder “click chemistry”. Firstly, the copolymers of poly(styrene-<I>alt</I>-maleic anhydride) (PSM) were prepared by the reversible addition-fragmentation chain transfer (RAFT) polymerization and subsequently functionalized with furfuryl amine to introduce anchoring groups. The copolymers were then grafted on CNTs via the Diels-Alder reaction in water through a conventional heating-stirring route and ultrasound-assisted method. The obtained nanocomposite materials were characterized by thermogravimetric analysis, Fourier transform infrared spectroscopy, X-ray photoelectron spectroscopy, Raman spectroscopy and transmission electron microscopy. The results indicated that the reaction rate under ultrasound irradiation was accelerated about 12 times than the one under the conventional heating-stirring condition without losing the grafting efficiency. The direct functionalization of CNTs formed a stably dispersed solution in water, promising a green and effective method for industrial process.</P> <P><B>Highlights</B></P> <P> <UL> <LI> The reaction rate was significantly accelerated by ultrasound irradiation. </LI> <LI> Direct functionalization of carbon nanotubes in water without catalyst. </LI> <LI> The process is simple and is not involving any hazardous chemicals. </LI> </UL> </P>
Le, Cuong M. Q.,Cao, Xuan Thang,Kim, Dong Woo,Ban, Uk Hyeon,Lee, Sang Ho,Lim, Kwon Taek Informa UK (TaylorFrancis) 2017 Molecular Crystals and Liquid Crystals Vol.654 No.1
<P>A pH-responsive drug release system based on doxorubicin conjugated poly(styrene-alt-maleic anhydride) grafted multi-walled carbon nanotubes (MWNT/PSMA-DOX) was prepared by the reversible addition-fragmentation chain transfer (RAFT) polymerization and acid-cleavable hydrazone linkages. Firstly, multi-walled carbon nanotubes (MWNTs) were modified with a furfuryl derivative RAFT agent by Diels-Alder reaction. The polymerization of styrene and maleic anhydride was carried out in the presence of functionalized MWNTs to afford MWNT/PSMA. The maleic anhydride ring located along the polymer chains was opened by hydrazine subsequently conjugated with doxorubicin via an acid-sensitive hydrazone bond. The composite materials were characterized by FT-IR, H-1-NMR, TGA and TEM analysis. In vitro experiments showed a burst release of doxorubicin at pH 5.0 whereas slight release at pH 7.4.</P>
Le, Cuong M.Q.,Cao, Xuan Thang,Jeong, Yeon Tae,Lim, Kwon Taek Elsevier 2018 Journal of industrial and engineering chemistry Vol.64 No.-
<P><B>Abstract</B></P> <P>Imidazolium-based poly(ionic liquid)s grafted on the surface of multiwalled carbon nanotubes (MWNTs) were prepared by Diels–Alder “click” reaction with a high grafting density. Poly(styrene-<I>alt</I>-maleic anhydride) (PSM) was functionalized with furfuryl amine and then it was modified with 1-(3-aminopropyl)-3-methylimidazolium bromide to produce poly(ionic liquid)s functionalized with furfuryl groups (PSMF-ILs). PSMF-ILs were directly grafted onto the surface of MWNTs under ultrasonication to form PSMF-IL/MWNT nanocomposites. The material was characterized by FTIR, Raman spectroscopy, XRD, XPS and TEM analyses. The results showed that a very high grafting density was achieved in deep eutectic solvents based on choline chloride:ethylene glycol in a short time.</P>
Le, Cuong M.Q.,Cao, Xuan Thang,Tu, Trang T.K.,Lee, Won-Ki,Lim, Kwon Taek Elsevier 2018 APPLIED SURFACE SCIENCE - Vol.450 No.-
<P><B>Abstract</B></P> <P>Deep eutectic solvents (DESs), a new type of cost-effective ionic liquid analogues, were employed to develop a novel and efficient method for direct functionalization of multiwalled carbon nanotubes (MWNTs) via Diels-Alder (DA) click reaction. Poly(ionic liquid)s featuring furfuryl moieties (P(F-ILs)) and butyl moieties (P(B-ILs)) were synthesized by the functionalization of poly(chloromethylstyrene-alt-maleic anhydride) with 1-methylimidazole and furfuryl amine or butylamine. Then, the polymer was directly grafted on the surface of untreated MWNTs in choline:ethylene glycol (ChCl:EG) based DES without any catalyst. The successful functionalization of the polymer on MWNTs was confirmed by Raman spectroscopy, TGA, and XPS analysis. It was shown that the reaction proceeded in a very rapid fashion (less than an hour) and the use of DESs significantly improved the grafting density (more than double) as compared with the reaction in water.</P> <P><B>Highlights</B></P> <P> <UL> <LI> Deep eutectic solvents was utilized as a green and efficient reaction media. </LI> <LI> Fast and facile method for grafting poly(ionic liquid)s onto carbon nanotubes. </LI> <LI> High grafting density was obtained under catalyst-free and mild reaction condition. </LI> </UL> </P> <P><B>Graphical abstract</B></P> <P>[DISPLAY OMISSION]</P>