The Suzuki–Miyaura coupling polymerization of PinB-F8T(3)-Br was accompanied by disproportionation, whereas that of PinB-F8T(4)-Br proceeded in a chain-growth polymerization manner to afford a well-defined fluorene-thiophene alternating copolymer.
Abstract The radical polymerization behavior of alkoxyallene containing the epoxy group, allenyl glycidyl ether ( I ), was investigated to obtain the more reactive polymer. The desired polymer was successfully synthesized only by the copolymerization of I with acrylonitrile (AN) at 80°C in DMF, although the homopolymer of I was converted to the crosslinked polymer during its purification. The same number of epoxy and two kinds of methylene groups were simultaneously introduced onto the polymer through propagating allyl radical. The obtained copolymer, therefore, was readily converted to the gelled polymer with methods such as heating and treating with Lewis acids or amines. Further, the copolymer containing two kinds of methylene groups was prepared similarly from methoxyallene ( II ) and AN, and was also converted to the crosslinked polymer with the cationic catalyst. These copolymers of I or II with AN will be expected to be new types of reactive polymers.
The Suzuki-Miyaura coupling polymerization of p-dibromophenylene and m-phenylenediboronic acid ester, as well as m-dibromophenylene and p-phenylenediboronic acid ester, and the combination of two meta-phenylene monomers in the presence of the t-Bu3PPd(0) catalyst selectively afforded cyclic polyphenylenes with polyphenylene bearing boronate moieties at both ends when excess dibromophenylene was used.
POLYMERIC MICELLES; POLYMERSOMESThe cover by Eleonora G. Hochreiner represents the process of polymerization-induced self-assembly (PISA) toward pharmaceutical application.Starting from the bottom right with the initial building blocks (hydrophilic polymer and hydrophobic monomer), polymeric micelles are formed upon block copolymer synthesis via PISA and loaded with therapeutic cargo (blue stars).The ultimate goal is application as drug delivery vehicles, which is indicated by the capsules in the top left corner.
