Surface-initiated atom transfer radical polymerization of poly(4-vinylpyridine) from magnetite nanoparticle |
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| Authors: | Boonjira Rutnakornpituk Uthai Wichai Tirayut Vilaivan Metha Rutnakornpituk |
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| Institution: | (1) Department of Chemistry and Center of Excellence for Innovation in Chemistry, Faculty of Science, Naresuan University, Phitsanulok, 65000, Thailand;(2) Organic Synthesis Research Unit, Department of Chemistry, Faculty of Science, Chulalongkorn University, Phayathai Road, Patumwan, Bangkok, 10330, Thailand |
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| Abstract: | Surface modification of magnetite nanoparticles (MNP) with a covalently bonded poly(4-vinylpyridine) (P4VP) by surface-initiated
atom transfer radical polymerization (ATRP) is reported in this article. MNP was first prepared via thermal decomposition
of Fe(acac)3 and grafted with an ATRP initiator on its surface. ATRP of 4-vinylpyridine was then initiated from the MNP surface in the
presence of CuBr/PMDETA (1,1,4,7,7-pentamethyldiethylenetriamine) catalytic complex in dioxane. FTIR in combination with photocorrelation
spectroscopy (PCS), thermogravimetric analysis (TGA), and vibrating sample magnetometry (VSM) techniques indicated the growth
of P4VP on the particle surface with increasing ATRP reaction time. Transmission electron microscopy (TEM) disclosed that
the average particle size was 8 nm in diameter with some nanoaggregation observed. The PCS results revealed that decreasing
the solution pH enhanced the particle dispersibility because of the positive charge repulsion of the protonated P4VP on the
particle surface. TGA was also performed to elucidate the composition of P4VP shell and magnetite core in the hybrid material. |
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