Combined SANS, SEC, NMR, and UV-Vis studies of simultaneous living anionic copolymerization process; Simultaneous elucidation of propagating living chains at three different length scales

SANS, SEC, NMR, UV-Visを複合的に用いたリビングアニオン共重合過程のその場観察に関する研究; 3種の異なる階層スケールにおけるリビング鎖の伸長過程に伴う構造形成の同時解明

Zhao, Y.; 田中 宏和*; 宮元 展義*; 小泉 智; 橋本 竹治

Zhao, Y.; Tanaka, Hirokazu*; Miyamoto, Nobuyoshi*; Koizumi, Satoshi; Hashimoto, Takeji

The living anionic copolymerization of a mixture of isoprene (I) and styrene (S) monomers, in the dilute solution with deuterated benzene as a non-polar solvent and sec-butyllithium as an initiator, was investigated by a simultaneous measurement of time-resolved small-angle neutron scattering (SANS), size exclusion chromatography (SEC), nuclear magnetic resonance (NMR), and ultraviolet-visible (UV-Vis) spectroscopy. The combined time-resolved study on the same single batch reaction solution enabled us to investigate the structural change of the propagating living chains in three different length scales on a rigorously common time scale: the type of living chain ends, primary structure of single living chains, and the association of living chains. Although the living anionic copolymerization of S and I has been studied extensively, there is no study so far that uses such a combination of real-time methods as this study on the same single batch reaction solution.