8 Sm+ s initiation CH2CH=CHCH- CHCH—CHCH + S H transfer - CH2CH=CHCH 2mm mmCH2CH2-CHCH2w+ CHCH=CHCH2S8 S + S - m + n initiation CH2 CH=CHCH 2 C H2 CH CHCH2 S + m + S - n H transfer CH2 CH=CHCH 2 C H2 C H2 CHCH2 S + m + + CHCH=CHCH2 S8