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A New Associative Diblock Copolymer of Poly(ethylene glycol) and Dense 1,2,3‐Triazole Blocks: Self‐Association Behavior and Thermoresponsiveness in Water
Author(s) -
Yang Yanqiong,
Hashidzume Akihito
Publication year - 2019
Publication title -
macromolecular chemistry and physics
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.57
H-Index - 112
eISSN - 1521-3935
pISSN - 1022-1352
DOI - 10.1002/macp.201900317
Subject(s) - lower critical solution temperature , ethylene glycol , polymer chemistry , copolymer , micelle , polymerization , click chemistry , aqueous solution , materials science , chemistry , organic chemistry , polymer
In this work, new diblock copolymers of poly(ethylene glycol) (PEG) and dense 1,2,3‐triazole blocks (EG m ‐ b ‐AP n and EG m ‐ b ‐AB n , where m and n denote the degrees of polymerization), are synthesized by copper(I)‐catalyzed azide–alkyne cycloaddition polymerization of 3‐azido‐1‐propyne (AP) and 3‐azido‐1‐butyne (AB), respectively, in the presence of PEG possessing a propargyl group. Their self‐association behavior and thermoresponsive property in water are investigated. The characterization data indicate that EG45‐ b ‐AP6 and EG45‐ b ‐AP14 form dominantly spherical micelles, EG18‐ b ‐AP4 and EG18‐ b ‐AP10 form vesicles, and EG18‐ b ‐AB7 forms rodlike micelles. Aqueous solutions of EG18‐ b ‐AP10, EG45‐ b ‐AP14, and EG18‐ b ‐AB7 undergo lower critical solution temperature (LCST)‐type phase separation. The thermoresponsive association behavior can be controlled by adjusting the ratio of block lengths and by attaching methyl substituents.