Poly(methyl　methacrylate)-b-poly(tert-butyl　acrylate)　(PMMA-b-PtBA)　block　copolymers　were　prepared　based　on　the　new　mechanism　of　1,1-diphenylethylene　(DPE)　controlled　radical　polymerization　in　homogeneous　systems.　Firstly,　monomer　methyl　methacrylate　(MMA),　initiator　2,2-azobisisoheptonitrile　(ABVN)　and　a　control　agent　DPE　were　solution　polymerized　to　form　DPE-containingPMMAprecursor.　Then　the　second　monomer　tert-butyl　acrylate　(tBA)　was　simply　heated　in　the　presence　of　DPE-containing　PMMA　precursor　used　as　macroinitiator,　and　block　copolymers　were　synthesized　successfully.　The　effects　of　polymerization　temperature　and　solvent　on　molecular　weight　and　molecular　weight　distribution　of　polymers　throughout　the　polymerization　were　investigated.　DPE-containing　poly(styrene)　precursor　could　not　induce　block　polymerization.