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      Synthesis of Polymer Grafted Magnetite Nanoparticle with the Highest Grafting Density via Controlled Radical Polymerization

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          Abstract

          The surface-initiated ATRP of benzyl methacrylate, methyl methacrylate, and styrene from magnetite nanoparticle is investigated, without the use of sacrificial (free) initiator in solution. It is observed that the grafting density obtained is related to the polymerization kinetics, being higher for faster polymerizing monomer. The grafting density was found to be nearly 2 chains/nm 2for the rapidly polymerizing benzyl methacrylate. In contrast, for the less rapidly polymerizing styrene, the grafting density was found to be nearly 0.7 chain/nm 2. It is hypothesized that this could be due to the relative rates of surface-initiated polymerization versus conformational mobility of polymer chains anchored by one end to the surface. An amphiphilic diblock polymer based on 2-hydroxylethyl methacrylate is synthesized from the polystyrene monolayer. The homopolymer and block copolymer grafted MNs form stable dispersions in various solvents. In order to evaluate molecular weight of the polymer that was grafted on to the surface of the nanoparticles, it was degrafted suitably and subjected to gel permeation chromatography analysis. Thermogravimetric analysis, transmission electron microscopy, and Fourier transform infrared spectroscopy were used to confirm the grafting reaction.

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          Nanoscale Materials in Chemistry

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            Nanoscale materials in chemistry

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              Author and article information

              Journal
              Nanoscale Res Lett
              Nanoscale Research Letters
              Springer
              1931-7573
              1556-276X
              2009
              14 June 2009
              : 4
              : 9
              : 1090-1102
              Affiliations
              [1 ]Department of Chemistry, Indian Institute of Technology, Madras, Chennai, 600 036, India
              Article
              1556-276X-4-1090
              10.1007/s11671-009-9365-z
              2894347
              20596283
              fb8976ca-3508-4db0-a57f-e017c7805757
              Copyright ©2009 to the authors
              History
              : 9 March 2009
              : 26 May 2009
              Categories
              Nano Express

              Nanomaterials
              atom transfer radical polymerization,magnetite nanoparticle,poly(benzyl methacrylate)

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