ATRP grafting from silica surface to create first and second generation ofgrafts

(11'-Chlorodimethylsilylundecyl)-2-chloro-2-phenylacetate 2 as an atom tran sfer radical polymerisation (ATRP) initiator was bound covalently to the su rface of silica. ATRP grafting of styrene monomer from the silica surface w as achieved and the grafts were detached from the solid particles for analy sis. It is shown that after polymerisation of a first generation of grafts and work-up of the thus grafted silica the chain ends of the grafts are sti ll active to initiate a second monomer feed to further chain growth.