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Molecularly Imprinted Shells from Polymer and Xerogel Matrices on Polystyrene Colloidal Spheres
Author(s) -
Guan Guijian,
Liu Renyong,
Mei Qingsong,
Zhang Zhongping
Publication year - 2012
Publication title -
chemistry – a european journal
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 1.687
H-Index - 242
eISSN - 1521-3765
pISSN - 0947-6539
DOI - 10.1002/chem.201102576
Subject(s) - dispersity , polystyrene , materials science , polymerization , polymer , chemical engineering , colloid , precipitation polymerization , molecularly imprinted polymer , chain transfer , surface modification , coating , monomer , nanotechnology , polymer chemistry , chemistry , radical polymerization , organic chemistry , composite material , selectivity , catalysis , engineering
We have devised a facile and general methodology for the synthesis of various molecularly imprinted shells at the surface of polystyrene (PS) colloidal spheres to recognize the explosive compound 2,4,6‐trinitrotoluene (TNT). PS spheres with surface‐functionalized carboxyl‐group layers could direct a selective imprinting polymerization on their surface through the hydrogen‐bonding interactions between surface carboxyl groups and amino monomers. Meanwhile, homogeneous polymerization in the solution phase was completely prevented by stepwise polymerization. The overall process led to the formation of monodisperse molecularly imprinted core–shell microspheres, and was very successful in the preparation of organic polymer and inorganic xerogel shells. Furthermore, greater capacity and faster binding kinetics towards target species were achieved, because surface‐imprinted sites ensured the complete removal of templates, good accessibility to target molecules, and low mass‐transfer resistance. The results reported herein, concerning the production of high‐quality molecularly imprinted products, could also form the basis for the formulation of a new strategy for the fabrication of various functional coating layers on colloidal spheres with potential applications in the fields of separations and chemical sensing.