Premium
Optically Active Poly[{methyl(1‐naphthyl)silylene}( o ‐phenylene)methylene]‐Poly(ethylene glycol) Block Copolymer Micelles
Author(s) -
Park Sung Young,
Kawakami Yusuke
Publication year - 2005
Publication title -
macromolecular chemistry and physics
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.57
H-Index - 112
eISSN - 1521-3935
pISSN - 1022-1352
DOI - 10.1002/macp.200400469
Subject(s) - copolymer , micelle , polymer chemistry , ethylene glycol , polymerization , polymer , methylene , phenylene , materials science , solvent , chemistry , photochemistry , organic chemistry , aqueous solution
Summary: Optically pure (+) and isotactic poly[{methyl(1‐naphthyl)silylene}( o ‐phenylene)methylene] terminated with methylphenylchlorosilyl was obtained by the Pt‐catalyzed ring‐opening polymerization of optically pure 1‐methyl‐1‐(1‐naphthyl)‐2,3‐benzosilacyclobut‐2‐ene in the presence of methylphenylchlorosilane as a chain transfer agent. The polymer formed was transformed into a block copolymer by reacting the terminal chlorosilyl group with a commercial poly(ethylene glycol) monomethyl ether. The formation of micelles by the block copolymer in THF‐water mixtures was investigated by fluorescence and UV. More detailed information about the aggregation of the polymer in the micelles was obtained by circular dichroism spectroscopy. It was found that dense aggregates were formed at a concentration higher than the critical micelle concentration. This concentration was higher for lower molecular weight polymer, at higher temperatures, and in more hydrophobic solvent systems. The highly aggregated structure was altered by changing the solvent system.