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|Title:||Hairy hollow microspheres of fluorescent shell and temperature-responsive brushes via combined distillation-precipitation polymerization and thiol-ene click chemistry|
|Citation:||Li, G.L., Xu, L.Q., Tang, X., Neoh, K.G., Kang, E.T. (2010-07-13). Hairy hollow microspheres of fluorescent shell and temperature-responsive brushes via combined distillation-precipitation polymerization and thiol-ene click chemistry. Macromolecules 43 (13) : 5797-5803. ScholarBank@NUS Repository. https://doi.org/10.1021/ma1008012|
|Abstract:||Nearly monodispersed silica core-poly(N-vinylcarbazole) shell (SiO 2@PVK) microspheres of 226, 235, and 244 nm in average diameters were first synthesized by surface-initiated distillation-precipitation polymerization of N-vinylcarbazole, in the presence of divinylbenzene, from the 197 nm silica template microspheres prepared by the sol-gel reaction of tetraethyl orthosilicate (TEOS) and 3-(trimethoxysilyl)propyl methacrylate (MPS). The SiO2@PVK-PNIPAM core-shell hairy microspheres (PNIPAM = poly(N-isopropylacrylamide)) were subsequently prepared by grafting the PNIPAM chains (Mn=11600 g/mol, polydispersity index =1.32), prepared a priori by reversible addition-fragmentation chain transfer (RAFT) polymerization, to the SiO2@PVK microspheres via the thiol-ene click chemistry. The grafting density of PNIPAM brushes on the SiO2@PVK microspheres was about 0.1 chains/nm2. Hairy hollow microspheres with a fluorescent and cross-linked PVK shell and temperature-responsive PNIPAM brushes were finally obtained, after selective removal of the inorganic silica core from the SiO2@PVK-PNIPAM microspheres by HF etching. The air@PVK-PNIPAM hairy hollow microspheres were characterized by field-emission scanning electron microscopy (FESEM), transmission electron microscopy (TEM), fluorescence spectroscopy, and dynamic laser scattering (DLS). © 2010 American Chemical Society.|
|Appears in Collections:||Staff Publications|
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