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Effects of molecular weight on dual light‐ and thermo‐responsive behaviors of homopolymers with azobenzene units and terminal oligo(ethylene glycol) units
Author(s) -
Yang ChangAn,
Chen Ling,
Huang He,
Lu Ying,
Xiong Biquan,
Liu Yu,
Yi Jianmin
Publication year - 2017
Publication title -
polymer international
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.592
H-Index - 105
eISSN - 1097-0126
pISSN - 0959-8103
DOI - 10.1002/pi.5434
Subject(s) - azobenzene , ethylene glycol , terminal (telecommunication) , polymer chemistry , materials science , dual (grammatical number) , ethylene , copolymer , chemistry , polymer , organic chemistry , composite material , computer science , telecommunications , catalysis , art , literature
A series of water‐soluble dual light‐ and thermo‐responsive homopolymers bearing azobenzene units and terminal oligo(ethylene glycol) units with well‐defined molecular weight ( M n = 0.69 × 10 4 to 4.60 × 10 4 g mol −1 ) were synthesized via reversible addition–fragmentation chain transfer polymerization. All the homopolymers exhibited reversible photoisomerization and their lower critical solution temperatures showed an unusual increase with increasing molecular weight. Interestingly, by increasing the molecular weight, the aggregate morphology of these polymers was found to evolve from a spherical to a cylindrical shape. © 2017 Society of Chemical Industry