Abstract
The pH-sensitive hollow poly( N, N′-methylenebisacrylamide- co-methacrylic acid) (P(MBAAm- co-MAA)) microspheres with movable magnetic/silica (Fe 3O 4/SiO 2) cores were prepared by the selective removal of poly(methacrylic acid) (PMAA) layer in ethanol/water from the corresponding Fe 3O 4/SiO 2/PMAA/P(MBAAm- co-MAA) tetra-layer microspheres, which were synthesized by the distillation precipitation copolymerization of N, N′-methylenebisacrylamide (MBAAm) and methacrylic acid (MAA) in the presence of Fe 3O 4/SiO 2/PMAA tri-layer microspheres as seeds in acetonitrile with 2,2′-azobisisobutyronitrile (AIBN) as the initiator. The Fe 3O 4/SiO 2/PMAA tri-layer microspheres were afforded by the distillation precipitation polymerization of MAA with 3-(methacryloxy)propyl trimethoxysilane (MPS)-modified Fe 3O 4/SiO 2 core–shell particles as the seeds. The functional multi-layer inorganic/polymer microspheres and the corresponding hollow polymer microspheres with movable magnetic cores were characterized with transmission electron microscopy (TEM), Fourier-transform infrared (FT-IR) spectra, dynamic light scattering (DLS), and vibrating sample magnetometer (VSM).
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