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Ultrafast PhotoRAFT Block Copolymerization of Isoprene and Styrene Facilitated through Continuous‐Flow Operation
Author(s) -
Lauterbach Felix,
Rubens Maarten,
Abetz Volker,
Junkers Tanja
Publication year - 2018
Publication title -
angewandte chemie international edition
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 5.831
H-Index - 550
eISSN - 1521-3773
pISSN - 1433-7851
DOI - 10.1002/anie.201809759
Subject(s) - copolymer , chain transfer , isoprene , styrene , polymerization , polymer chemistry , polystyrene , living polymerization , polymer , radical polymerization , reversible addition−fragmentation chain transfer polymerization , raft , chemistry , monomer , materials science , photochemistry , organic chemistry
Polymers made from isoprene and styrene resemble an important class of synthetic macromolecules found in a wide range of everyday commodity products. Their synthesis is usually limited to radical emulsion or anionic polymerization. Herein, we report on ultrafast photoiniferter reversible addition‐fragmentation chain transfer (RAFT) polymerization of isoprene and styrene in a continuous‐flow microreactor. The cooperative action of a high photoinitiation efficiency and use of elevated temperatures considerably reduces the reaction times to less than half an hour to give high monomer conversions, allowing for the first time polyisoprene to be yielded from controlled radical polymerization in high definition and reasonable reaction times. High chain‐end fidelities are maintained and block copolymers were prepared including a polystyrene‐ block ‐polyisoprene‐ block ‐polystyrene (PS‐ b ‐PI‐ b ‐PS) triblock copolymer.