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Xuan Thang Cao,ALIMD SHOWKAT,Long Giang Bach,정연태,김종수,임권택,제갈영순 한국물리학회 2015 THE JOURNAL OF THE KOREAN PHYSICAL SOCIETY Vol.66 No.1
Photoluminescent hybrids of poly("-caprolactone) (PCL), polyhedral oligosilsesquioxane (POSS)and terbium ions (Tb3+) were synthesized by using a combination of ring-opening polymerization(ROP), click chemistry and coordination chemistry. Initially, acetylene functionalized PCL (alkyne-PCL-COOH) was prepared by using ROP of "-caprolactone with propargyl alcohol, and azidesubstitutedPOSS (POSS-N3) was prepared by using the reaction of chloropropyl-heptaisobutylsubstitutedPOSS with NaN3. The click reaction between alkyne-PCL-COOH and POSS-N3 affordedPOSS-g-PCL, which was subsequently coordinated with Tb3+ ions in the presence of 1,10-phenanthroline to produce POSS-g-PCL-Tb3+-Phen. The structures and compositions of the hybridswere investigated by using 1H nuclear magnetic resonance (NMR), Fourier-transform infraredspectroscopy (FT-IR), Field emission scanning electron microscope (FE-SEM), Transmission electronmicroscopy (TEM), and Thermogravimetric analysis (TGA). The optical properties of POSSg-PCL-Tb3+-Phen complexes were characterized by using photoluminescence spectroscopy, whichshowed four high emission bands centered at 489, 545, 584, and 620 nm with excitation at 330 nm. The emission spectra of the europium-ion-coordinated hybrids, POSS-g-PCL-Eu3+-Phen, had fourhigh-intensity peaks, 594, 617, 652 and 686 nm, for an excitation wavelength of 352 nm.
Xuan Thang Cao,Maheshkumar Prakash Patil,Quoc Thang Phan,Cuong M.Q. Le,Byung-Hyun Ahn,GUN-DO KIM,임권택 한국공업화학회 2020 Journal of Industrial and Engineering Chemistry Vol.83 No.-
This paper reports a green and direct functionalization of poly(ethylene glycol)-graft-[furfuryl-graft-(poly(styrene-alt-maleic anhydride))] (PEG-PSMF) on the surface of single walled carbon nanotubes (SWCNTs)in aqueous media through Diels-Alder (DA) click reaction. Firstly, novel PEG grafted, furfurylfunctionalized copolymers were prepared by RAFT polymerization followed by ring opening reactions. The functional copolymer was simply grafted on SWCNTs by DA reaction at room temperature underultrasonication. The resulting hybrid materials were characterized by 1H NMR, GPC, UV–vis, FT-IR, TGA,TEM, and DLS. The hybrid materials possessed a high drug loading capacity (DLC) of doxorubicin (DOX),which could reach up to 279.9 wt.% of DLC. Moreover, in vitro drug release profiles showed that drugrelease rate at pH 5.5 under an acidic condition of tumor cell microenvironment was much higher than atpH 7.4 of the physiological condition. MTT assays demonstrated that the hybrid materials did not haveany practical cytotoxicity against the normal HEK293 cell line, while drug loaded hybrids displayed a highantitumor activity towards HeLa cancer cells. This strategy offers a promising SWCNT-based drug carrierfor tumor-targeted chemotherapy.