Synthesis and characterization of monosize magnetic poly(glycidyl methacrylate) beads--颗粒学报PARTICUOLOGY

Altıntaş, E. B., Uzun, L., & Denizli, A. (2007). Synthesis and characterization of monosize magnetic poly(glycidyl methacrylate) beads. China Particuology, 5(1), 174–179. https://doi.org/10.1016/j.cpart.2007.01.004

Synthesis and characterization of monosize magnetic poly(glycidyl methacrylate) beads

Evrim Banu Altıntaş ^a, Lokman Uzun ^a, Adil Denizli ^a *

a Department of Chemistry, Biochemistry Division, Hacettepe University, Ankara, Turkey

10.1016/j.cpart.2007.01.004

Volume 5, Issues 1–2, February–April 2007, Pages 174-179

Received 26 June 2006, Accepted 14 January 2007, Available online 6 June 2007.

E-mail: denizli@hacettepe.edu.tr

Highlights

Abstract

Monosize, 1.6 μm, magnetic beads of poly(glycidyl methacrylate) [M-poly(GMA)], were prepared by dispersion polymerization in the presence of Fe₃O₄ nano-powder. Monosize M-poly(GMA) beads were characterized by swelling tests, density measurements, electron spin resonance (ESR), vibrating sample magnetometer (VSM) and scanning electron microscopy (SEM). The characteristic functional groups of M-poly(GMA) beads were analyzed by Fourier transform infrared spectrometer (FTIR). The M-poly(GMA) beads are highly uniform in size and have a spherical shape and non-porous structure. Polydispersity index (PDI) of M-poly(GMA) beads was calculated to be around 1.008. The hydrated density of the M-poly(GMA) beads measured at 25 °C was 1.14 g/cm3. The content of oxirane groups on the surface of the M-poly(GMA) sample was found to be 3.46 mmol/g by using perchloric acid titration. The specific surface area of the M-poly(GMA) beads was determined to be 3.2 m2/g. The equilibrium swelling ratio was 52%. The volume fraction of magnetite nanopowder in the M-poly(GMA) beads was found to be 4.5%. The g factor, that can be considered as a quantity characteristic of the molecules in which the unpaired electrons are located, was found to be 2.28 for M-poly(GMA). The external magnetic field at resonance was calculated to be 2055 Gs which was found sufficient to excite all of the dipole moments present in 1.0 g of M-poly(GMA) sample.

Graphical abstract

Keywords

Polyglycidyl methacrylate; Monosize beads; Magnetic materials

文章导读