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Stimuli‐Responsive SiO 2 ‐ graft ‐Poly(sodium acrylate) Hybrid Nanoparticles via Cu 2+ ‐Amine Redox‐Initiated Radical Polymerization
Author(s) -
Tao Feng,
Chen Xiaobo,
Zhai Guangqun
Publication year - 2013
Publication title -
macromolecular chemistry and physics
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.57
H-Index - 112
eISSN - 1521-3935
pISSN - 1022-1352
DOI - 10.1002/macp.201300455
Subject(s) - polymerization , chemistry , polymer chemistry , aqueous solution , polyelectrolyte , radical polymerization , nanoparticle , amine gas treating , acrylate , nuclear chemistry , copolymer , materials science , organic chemistry , polymer , nanotechnology
A novel strategy is proposed to initiate radical graft polymerization of sodium acrylate (NaAAc) from amine‐functionalized SiO 2 nanoparticles (SiO 2 ‐NH 2 ) to prepare hybrid SiO 2 nanoparticles with NaPAAc chains (SiO 2 ‐ g ‐NaPAAc). The polymerization is carried out in aqueous media at ca. 70–90 °C using CuSO 4 as an oxidizing agent. Cu 2+ oxidizes primary amine into aminyl radicals, initiating radical graft polymerization of NaAAc. The hybrid SiO 2 ‐ g ‐NaPAAc nanoparticles are characterized by infrared spectroscopy, thermal gravimetric analysis, and X‐ray photoelectron spectroscopy. The morphology is observed by electron microscopy. NaPAAc chains are successfully grafted from SiO 2 ‐NH 2 , and the grafting yield is as high as 59.46 wt%. SiO 2 ‐ g ‐NaPAAc exhibits a lower degree of aggregation compared with SiO 2 ‐NH 2 when dispersed in aqueous media. SiO 2 ‐ g ‐NaPAAc exhibits a more stable dispersion in deionized water than SiO 2 ‐NH 2 , and addition of a low‐molecular‐weight electrolyte reduced the stability of SiO 2 ‐ g ‐NaPAAc in aqueous dispersion, due to the pH‐sensitive polyelectrolyte effect of NaPAAc chains.