Abstract
Core−shell type imprinted spherical particles were prepared by using a conventional polymer solution coating method. A poly(amic acid) was synthesized by step-reaction polymerization of the diamines (1:19 mole ratio of the diamine monomer−template complex:4,4‘-oxydianiline) and the pyromellitic dianhydride in N,N-dimethylacetamide at ambient temperature. The diamine monomer−template complex was synthesized by the reaction of the diamine having an isocyanato group and estrone (template) having a phenol moiety, in which the template was connected to the monomer by means of a thermally reversible urethane bond. The poly(amic acid) containing the template (estrone) molecule was used for the coating of a silica sphere, of which surface was functionalized with amino groups to increase the adhesion property of the poly(amic acid) film on the silica. The thermal imidization resulted in a spherical silica particle coated with a polyimide (thickness of polyimide: about 100 nm). The template molecules were removed ...
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