[1] Adam Mickiewicz Univ, Macromol Phys, Poznan, Poland
[2] Univ Gdansk, Fac Chem, PL-80952 Gdansk, Poland
[3] Univ Cambridge, Dept Chem, Macromol Phys, Lensfield Rd, Cambridge CB2 1EW, England
[4] Univ Cambridge, Dept Chem, Lensfield Rd, Cambridge CB2 1EW, England