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Grafting of titanium dioxide microspheres with a temperature‐responsive polymer via surface‐initiated atom transfer radical polymerization without the use of silane coupling agents
Author(s) -
Smirnov Eugene A,
Meledina Maria A,
Garshev Alexey V,
Chelpanov Vitaly I,
Frost Sven,
Wieneke Jan U,
Ulbricht Mathias
Publication year - 2013
Publication title -
polymer international
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.592
H-Index - 105
eISSN - 1097-0126
pISSN - 0959-8103
DOI - 10.1002/pi.4377
Subject(s) - atom transfer radical polymerization , materials science , polymer chemistry , radical polymerization , polymerization , polymer , surface modification , lower critical solution temperature , chemical engineering , dynamic light scattering , copolymer , nanoparticle , nanotechnology , composite material , engineering
Titania microspheres with narrow size distribution and diameters of about 1 µm were prepared and subsequently functionalized using surface‐initiated atom transfer radical polymerization ( ATRP ) of N ‐isopropylacrylamide. The ATRP initiator was immobilized on the particle surface via acylation of surface hydroxyl groups with α ‐bromoisobutyryl bromide. Subsequently, an established ATRP reaction system was used for the preparation of titania surface‐grafted poly( N ‐isopropylacrylamide) ( PNiPAAm ). Characterization was performed with electron microscopies, X‐ray diffraction, infrared spectroscopy and dynamic light scattering. It was found that the particle size in aqueous dispersions changed reversibly with temperature as expected for a shell of PNiPAAm , a polymer with a lower critical solution temperature at 32 °C. This confirmed the successful preparation of functional, stimuli‐responsive TiO 2 microparticles via a straightforward controlled surface‐initiated polymerization method.

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