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Surface-initiated controlled radical polymerizations (SIP) from initiator-modified surfaces lead to polymer brushes with variable compositions, architectures and functionalities, as well as complex (co)polymers and organic/inorganic hybrid materials. Among the different controlled radical polymerization techniques, atom transfer radical polymerization (ATRP) is widely used for tailoring the surface chemistry and topography. However, a number of problems always exist:
polymerization in inert atmosphere; less control due to fast polymerization; large amount of
monomer wasted. We have developed some novel approaches that can allow SI-ATRP to proceed in
ambient environment, ultrasmall volume solutions and in more controlled manner. We are
particularly interested in the type of charged polymer brushes, i.e. polyelectrolyte brushes. Charge repulsion makes polymer chains assume more stretched state and can be easily tuned by counterions interaction. In the way, the conformation can be changed. This provides feasible way to tune the surface friction property. |
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