ABA triblock copolymers containing polyisoprene segments

such as polyisoprene-b-polystyrene-b-polyisoprene (PIP-b-PSt-b-PIP) and polyisoprene-b-poly(methyl methacrylate)-b-polyisoprene (PIP-b-PMMA-b-PIP)

were prepared with macro-iniferter technique．The mcro-iniferter (PSt-CCDCM and PMMA-CCDCM)bearing α-and ω-N

N-diethyldithiocarbamyl (DC) groups were synthesized by bulk polymerization of St and MMA with diethyl 2

3-dicyano-2

3-di(p-N

N-diethyldithiocarbamylmethyl)-phenylsuccinate (DDDCS) as a thermal iniferter．The block copolymerization of IP with PSt-CCDCM or PMMA-CCDCM was carried out under UV light irradiation．The block copolymers were characterized by 1H-NMR

GPC and DSC analyses

and the polymerization proceeded as a living polymerization process．