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From Smart Denpols to Remote‐Controllable Actuators: Hierarchical Superstructures of Azobenzene‐Based Polynorbornenes
Author(s) -
Kim DaeYoon,
Shin Suyong,
Yoon WonJin,
Choi YuJin,
Hwang JooKyoung,
Kim JinSoo,
Lee CheulRo,
Choi TaeLim,
Jeong KwangUn
Publication year - 2017
Publication title -
advanced functional materials
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 6.069
H-Index - 322
eISSN - 1616-3028
pISSN - 1616-301X
DOI - 10.1002/adfm.201606294
Subject(s) - azobenzene , photoisomerization , materials science , polymerization , actuator , polymer , smart material , nanotechnology , polymer chemistry , chemical engineering , isomerization , composite material , organic chemistry , computer science , chemistry , artificial intelligence , catalysis , engineering
For the demonstration of remote‐controllable actuators, a dendronized polymer (denpol) is newly designed and successfully synthesized by ring‐opening metathesis polymerization of azobenzene‐based macromonomers. The incorporation of azobenzene mesogens into the denpols helps to construct finely tuned hierarchical superstructures with anisotropic physical properties and reversible photoisomerization. The polynorbornene backbones and azobenzene side chains in the uniaxially oriented films are aligned perpendicularly and parallel to the layer normal, respectively. Based on photoreversible actuation experiments combined with diffraction results, direct relationships between the chemical structures, hierarchical superstructures, and their corresponding photomechanical behaviors are proposed. Smart denpols possess great potential for practical applications in photoresponsive switches.