課題組工作在Polym. Chem. 上發(fā)表
A facile and general method for the preparation of chemically responsive
polymer films is demonstrated. First, a crosslinked polymer precoating
layer is created via self-initiated photografting and
photopolymerization of ethylene glycol dimethacrylate on a
self-assembled monolayer of a 3-(trimethoxysilyl)propylamine modified
oxidized silicon wafer. The intact methacrylate functionalities are used
to grow polymer chains by a second self-initiated photografting and
photopolymerization of vinyl monomers to form polymer brushes on the
crosslinked layer; thus a series of polymer membranes of PMMA, PDMAEMA
and P4VP are obtained. The double-layered polymer membranes can be
lifted off via hydrofluoric acid etching of the oxidized
silicon layer to give integral free-standing polymer membranes. Kinetic
studies revealed that the thickness of both the crosslinked precoating
layer and the brush layer increased linearly as a function of the
polymerization time before the reaction solutions got highly viscous.
Furthermore, polyoxometalate Na9(EuW10O36)
can be uniformly incorporated into the PDMAEMA membrane through
electrostatic interactions to afford an acid/base gas-responsive
luminescent hybrid film.