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RISS 인기검색어
- 검색키워드
- 저자 : ( Daloar Hossain ) (검색결과 7 건)
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Facile synthesis of core-surface crosslinked nanoparticles by interblock RAFT polymerization
Hossain, MD. Daloar,Tran, Le Thi Bao,Park, Jong Myung,Lim, Kwon Taek Wiley Subscription Services, Inc., A Wiley Company 2010 Journal of polymer science Part A, Polymer chemist Vol.48 No.22
<P>A new, efficient method for synthesizing stable nanoparticles with poly(ethylene oxide) (PEO) functionalities on the core surface, in which the micellization and crosslinking reactions occur in one pot, has been developed. First, amphiphilic PEO-b-PS copolymers were synthesized by reversible addition fragmentation chain transfer (RAFT) radical polymerization of styrene using (PEO)-based trithiocarbonate as a macro-RAFT agent. The low molecular weight PEO-b-PS copolymer was dissolved in isopropyl alcohol where the block copolymer self-assembled as core-shell micelles, and then the core-shell interface crosslink was performed using divinylbenzene as a crosslinking agent and 2,2′-azobisisobutyronitrile as an initiator. The design of the amphiphilic RAFT agent is critical for the successful preparation of core-shell interface crosslinked micellar nanoparticles, because of RAFT functional groups interconnect PEO and polystyrene blocks. The PEO functionality of the nanoparticles surface was confirmed by <SUP>1</SUP>H NMR and FTIR. The size and morphology of the nanoparticles was confirmed by scanning electron microscopy, transmission electron microscopy, and dynamic laser light scattering analysis. © 2010 Wiley Periodicals, Inc. J Polym Sci Part A: Polym Chem, 2010</P> <B>Graphic Abstract</B> <P>PEO-b-PS copolymers prepared by reversible addition fragmentation chain transfer (RAFT) radical polymerization of styrene using poly(ethylene oxide) (PEO)-based trithiocarbonate as a macro-RAFT agent were employed to the synthesis of stable nanoparticles with PEO functionalities on the core surface, where the micellization and cross-linking reactions occur in one pot. The cross-linking was performed using divinylbenzene as a cross-linking agent and AIBN as an initiator to produce the core-shell interface cross-linked micellar nanoparticles. <img src='wiley_img_2010/0887624X-2010-48-22-POLA24291-gra001.gif' alt='wiley_img_2010/0887624X-2010-48-22-POLA24291-gra001'> </P>
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Hossain, Md Daloar,Hwang, Ha Soo,Kim, Hyun Gyu,Lim, Kwon Taek American Scientific Publishers 2010 Journal of Nanoscience and Nanotechnology Vol.10 No.4
<P>Poly(methyl methacrylate)/Montmorillonite clay nanocomposites were synthesized via the free radical polymerization of methyl methacrylate in the presence of alkyl ammonium substituted polysilsesquioxane surfactant-modified clay and AIBN initiator in ethanol and aqueous ethanol solvent. MMT clay was initially cation exchanged with the surfactant to enhance its hydrophobicity and to expand the interlamellar spaces of silicate platelets. The 3-D structured surfactant and water molecules reduce the surface energy of the clay dramatically, which promotes miscibility of polymer/ clay nanocomposites. The intercalation and dispersion of clay were quantified by both X-ray diffraction and transmission electron microscopy, and the morphologies of the nanocomposites were observed by scanning electron microscopy. Both the alkyl ammonium polysilsesquioxane surfactant and filler clay enhanced thermal and mechanical properties of the nanocomposites as investigated with thermo gravimetric analysis and differential scanning calorimetry.</P>
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