In situ and real-time studies of simultaneous living anionic copolymerization process and reaction-induced self-assembly by using a combined SANS, UV-vis, and SEC method

POLY 333

Takeji Hashimoto, hashi2@pearl.ocn.ne.jp, Advanced Science Research Center, Japan Atomic Energy Agency, Tokai-mura, Naka-gun, Ibaraki Prefecture, 319-1195, Japan
We investigated a simultaneous living anionic copolymerization process of isoprene and styrene-d8 in benzene-d6 as a solvent and with sec-buthyllithium as an initiator into polyisoprene(PI)-block-poly(styrene-d8)(PS) and the polymerization-induced molecular self-assembling process. This process was observed in-situ by time-resolved small-angle neutron scattering (SANS), UV-vis, and SEC. The SANS exhibited three time regions: (i) the selective growth of PI chains, (ii) the crossover of the living chain ends from isoprenyllithium to styryllithium, and (iii) the polymerization-induced disorder-to-order transition and order-to-order transition. The author gratefully acknowledges that this work was done in collaboration with S. Koizumi, Y. Zhao, and N. Miyamoto.
 

40 Years of Macromolecules
8:00 AM-12:00 PM, Tuesday, August 21, 2007 Westin Boston Waterfront -- Grand Ballroom B, Oral

Division of Polymer Chemistry

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