Small-angle X-ray scattering (SAXS) was measured from the aqueous solutions of polyion complexes (PICs), prepared with isoelectrical mixing oppositely charged two block copolymers MAPTAC-b-PMPC and AMPS-b-PMPC. The ratio (Rp) of the polymerization degree of the cationic to the neutral chains was changed from 0.27 to 9.5. When Rp is 0.27, 4.7 and 9.5, PICs took a star-like spherical, a cylindrical and vesicle-like shape, respectively. We found how tethered PMPC chains are crowded on the shell, and this parameter was much smaller than those of PEG in spherical core-shell polymeric micelles.
- Shunsuke Sakamoto
- Yusuke Sanada
- Kazuo Sakurai