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Silica/poly ( N ‐vinylimidazolium) nanospheres by combined RAFT polymerization and thiol‐ene click chemistry
Author(s) -
Peng Chang,
Pan Wu,
Bao Lin,
Chen Shu,
Chen Yi,
Han Mingsong,
Xiong Yuanqin,
Xu Weijian
Publication year - 2014
Publication title -
polymers for advanced technologies
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.61
H-Index - 90
eISSN - 1099-1581
pISSN - 1042-7147
DOI - 10.1002/pat.3271
Subject(s) - dispersity , materials science , ene reaction , chain transfer , polymerization , click chemistry , polymer chemistry , grafting , thermogravimetric analysis , raft , alkene , chemical engineering , catalysis , radical polymerization , organic chemistry , chemistry , polymer , engineering , composite material
We report a facile method that combined sol–gel reaction, reversible addition–fragmentation chain transfer (RAFT)/macromolecular design via interchange of the xanthates process and thiol‐ene click reaction to prepare monodisperse silica core‐poly( N ‐vinylimidazole) (PVim) shell microspheres of 200 nm in average diameters. First, silica with C = C double bonds was prepared by the sol–gel reaction of 3‐(trimethoxysilyl)propyl methacrylates (MPS) with tetraethoxysilane in ethanol; SiO 2 @PVim were subsequently prepared by grafting PVim chain (Mn = 9800 g/mol, polydispersity index = 1.22) to MPS‐SiO 2 via the thiol‐ene click chemisty. The obtained SiO 2 @PVim microspheres show higher catalytic activity toward the hydrolysis of p ‐nitrophenyl acetate compared with the PVim homopolymers. The as‐prepared composites have been characterized by scanning electron microscopy, transmission electron microscopy, thermal gravimetric analysis and Fourier transform infrared spectrometry analysis. Copyright © 2014 John Wiley & Sons, Ltd.