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- W2051570635 abstract "Abstract A series of polystyrene‐ block ‐poly( n ‐butyl methacrylate) (PS‐ b ‐P n BMA) diblock copolymers (di‐BCPs) with an azobenzene moiety [ trans ‐4‐methacryloyloxyazobenzene (MOAB)] in the P n BMA segment was prepared by atom transfer radical polymerization (ATRP). P( n BMA‐ co ‐MOAB) macroinitiators were prepared by activators regenerated by electron transfer (ARGET) ATRP. The MOAB was slightly more reactive than n BMA, resulting in a weak gradient fashion of copolymer. The macroinitiators were subsequently chain‐extended with styrene. Acceleration of the ATRP rate was observed in the presence of a reducing agent. P( n BMA‐ co ‐MOAB)‐ b ‐PS di‐BCPs were obtained with relatively narrow molecular weight distributions ( $overline M _{rm w}$ / $overline M _{rm n}$ = 1.16–1.49) and the molecular weights were in good agreement with the theoretical values. The efficiency of photoisomerization of the MOAB units was above 80%. DSC traces showed a single T g suggesting the block copolymers were miscible before UV irradiation. After UV irradiation, the X‐ray reflectivity measurements showed the beating of two frequencies, indicating the formation of island‐hole structure. magnified image" @default.
- W2051570635 created "2016-06-24" @default.
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- W2051570635 date "2009-09-15" @default.
- W2051570635 modified "2023-10-07" @default.
- W2051570635 title "Synthesis of Photoisomerizable Block Copolymers by Atom Transfer Radical Polymerization" @default.
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- W2051570635 doi "https://doi.org/10.1002/macp.200900195" @default.
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