Synthesis of end-functionalized polymers with various sequences by living cationic polymerization and their thermosensitive behavior

POLY 139

Hiroaki Shimomoto, simomoto@chem.sci.osaka-u.ac.jp, Shokyoku Kanaoka, kanaoka@chem.sci.osaka-u.ac.jp, and Sadahito Aoshima, aoshima@chem.sci.osaka-u.ac.jp. Department of Macromolecular Science, Graduate School of Science, Osaka University, 1-1 Machikaneyama, Toyonaka, Osaka, 560-0043, Japan
Thermosensitive poly(vinyl ether)s with various end-functional groups were synthesized via living cationic polymerization in the presence of an added base. With aqueous solutions of homopolymers, a hydrophilic or a hydrophobic terminal induced an increase or a decrease in cloud point, respectively. Significant differences have arisen, in particular, with shorter end-functionalized polymers (Mn ≤ 104). End-functionalized diblock copolymers were also prepared by living cationic polymerization. An amphiphilic diblock copolymer with an octadecyl group (C18H37) at the end of the core-forming segment differed in thermoresponsive behavior from that without the terminal long alkyl chain. On the other hand, diblock copolymer having a carboxy terminal at the end of corona segment showed no cloud point in an alkaline aqueous solution even above the LCST temperature, in which the polymer formed surface-modified micelle with carboxy groups in water.
 

General Papers: Functional Materials
6:00 PM-8:00 PM, Sunday, August 19, 2007 BCEC -- Exhibit Hall - B2, Poster

Division of Polymer Chemistry

The 234th ACS National Meeting, Boston, MA, August 19-23, 2007