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Monomer Protonation‐Dependent Surface Polymerization to Achieve One‐Step Grafting Cross‐Linked Poly(4‐Vinylpyridine) Onto Core–Shell Fe 3 O 4 @SiO 2 Nanoparticles
Author(s) -
Tian Kesong,
Li Ruifei,
Wang Haiyan,
Chen Yan,
Guo Wanchun,
Wang Yaqi,
Xu Zhaopeng
Publication year - 2017
Publication title -
macromolecular rapid communications
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 1.348
H-Index - 154
eISSN - 1521-3927
pISSN - 1022-1336
DOI - 10.1002/marc.201700494
Subject(s) - polymerization , monomer , protonation , nanoparticle , polymer chemistry , silanol , polymer , grafting , materials science , surface modification , chemical engineering , adsorption , deprotonation , chemistry , organic chemistry , nanotechnology , catalysis , ion , engineering , composite material
Functional polymer‐grafting silica nanoparticles hold great promise in diverse applications such as molecule recognition, drug delivery, and heterogeneous catalysis due to high density and uniform distribution of functional groups and their tunable spatial distance. However, conventional grafting methods from monomers mainly consist of one or more extra surface modification steps and a subsequent surface polymerization step. A monomer protonation‐dependent surface polymerization strategy is proposed to achieve one‐step uniform surface grafting of cross‐linked poly(4‐vinylpyridine) (P4VP) onto core–shell Fe 3 O 4 @SiO 2 nanostructures. At an approximate pH, partially protonated 4VP sites in aqueous solution can be strongly adsorbed onto deprotonated silanol groups (SiO − ) onto Fe 3 O 4 @SiO 2 nanospheres to ensure prior polymerization of these protonated 4VP sites exclusively onto Fe 3 O 4 @SiO 2 nanoparticles and subsequent polymerization of other 4VP and divinylbenzene monomers harvested by these protonated 4VP monomers onto Fe 3 O 4 @SiO 2 nanoparticles, thereby achieving direct grafting of cross‐linked P4VP macromolecules onto Fe 3 O 4 @SiO 2 nanoparticles.