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Novel diblock copolymers consisting of a multibranched polymethacrylate segment with densely grafted poly[2-(2-methoxyethoxy)ethyl vinyl ether] pendants and a poly (N-isopropylacrylamide) segment are synthesized by a combination of living cationic polymerization and RAFT polymerization, as presented on page 786 by Masahiko Minoda, Tatsuya Shimizu, Sadao Miki, and Jin Motoyanagi. The obtained diblock copolymers possess well-controlled architectures. The aqueous solutions of the diblock copolymers exhibit two-stage thermoresponsive properties denoted by the appearance of two cloud points upon heating, indicating that the densely grafted poly[2-(2-methoxyethoxy) ethyl vinyl ether] pendants and the poly(N-isopropylacrylamide) segments independently respond to temperature.