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Molecularly imprinted polymers (MIPs) are tailor-made biomimetic receptors obtained by polymerization in the presence of molecular templates. They contain binding sites for target molecules with affinities and specificities on a par with those of antibodies, hormone receptors or enzymes. Mainly synthesized via radical polymerization of vinyl monomers, MIPs have also recently taken advantage of the...
Submicrometer-sized, polystyrene (PS) particles with controlled molecular weight distribution (MWD), were successfully obtained directly as powder state by iodine transfer dispersion polymerization (dispersion ITP) and reversible chain transfer catalyzed dispersion polymerization (dispersion RTCP) in supercritical carbon dioxide (scCO 2 ) for the first time. These dispersion polymerizations...
Diblock and miktoarm star-shaped thermoresponsive copolymers composed of single-stranded DNA (ssDNA) and poly(N-isopropylacrylamide) were successfully synthesized with combination of atom transfer radical polymerization (ATRP) and click chemistry. This approach should be generalizable to other DNA-functionalized copolymers. Such copolymers self-assemble into spherical micelles with ssDNA corona in...
This article introduces the new family of living radical polymerizations with germanium (Ge), tin (Sn), phosphorus (P), and nitrogen (N) catalysts which we recently developed. The polymerizations are based on a new reversible activation mechanism, Reversible chain Transfer (RT) catalysis. Low-polydispersity polymers are obtained in the homopolymerizations and random and block copolymerizations of...
The degenerative (exchange) chain transfer constant C ex was determined for the dithioacetate-mediated living radical block and random copolymerizations of styrene (St) and methyl methacrylate (MMA) at 40°C. The addition of the polystyrene (PSt) radical to a polymer–dithioacetate adduct (P–X) to form the intermediate radical (PSt–(X)–P) was (about twice) faster than that of the poly(methyl...
The structure and dynamics for the two types of polystyrene gels prepared by conventional and living radical polymerizations have been investigated by time-resolved dynamic light scattering (TRDLS). The reaction was initiated with the monomer solutions with and without a reversible addition–fragmentation chain transfer (RAFT) agent and was monitored through the gelation process. In the absence of...
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