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Design and synthesis of thermoresponsive aliphatic polyethers with a tunable phase transition temperature

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Title: Design and synthesis of thermoresponsive aliphatic polyethers with a tunable phase transition temperature
Authors: Isono, Takuya Browse this author
Miyachi, Kana Browse this author
Satoh, Yusuke Browse this author
Sato, Shin-ichiro Browse this author
Kakuchi, Toyoji Browse this author
Satoh, Toshifumi Browse this author →KAKEN DB
Issue Date: 7-Oct-2017
Publisher: Royal Society of Chemistry
Journal Title: Polymer chemistry
Volume: 8
Issue: 37
Start Page: 5698
End Page: 5707
Publisher DOI: 10.1039/c7py01238a
Abstract: This paper describes a comprehensive study of the lower critical solution temperature (LCST)-type thermoresponsive properties of various poly(glycidyl ether) homopolymers with a varying side chain structure, molecular weight, and main chain tacticity, as well as their copolymers with a varying monomer composition and monomer sequence. For the initial screening, we prepared nine kinds of poly(glycidyl ether)s by the phosphazene base-catalyzed ring-opening polymerization of glycidyl methyl ether (MeGE), ethyl glycidyl ether (EtGE), glycidyl isopropyl ether (iPrGE), 2-methoxyethyl glycidyl ether (MeEOGE), 2-ethoxyethyl glycidyl ether (EtEOGE), 2-propoxyethyl glycidyl ether (PrEOGE), 2-(2- methoxyethoxy) ethyl glycidyl ether (MeEO(2)GE), 2-(2-ethoxyethyl) ethyl glycidyl ether (EtEO(2)GE), and 2-(2-(2-methoxyethoxy) ethoxy) ethyl glycidyl ether (MeEO(3)GE). Among them, poly(MeGE), poly(EtGE), poly(MeEOGE), poly(EtEOGE), and poly(MeEO(2)GE) (M-n = ca. 5000 g mol(-1)) were found to exhibit a LCST-type phase transition in water at 65.5 degrees C, 10.3 degrees C, 91.6 degrees C, 41.3 degrees C, and 58.2 degrees C, respectively. Although the molecular weight and main chain tacticity had little impact on the phase transition temperature, the side chain structure, i.e., the number of oxyethylene units and terminal alkyl groups, significantly affected the transition temperature. The statistical copolymers composed of MeEOGE and EtEOGE revealed that the transition temperature of the polymer can be desirably customized in between those of the homopolymers by varying the monomer composition. On the other hand, we found that the block copolymer composed of MeEOGE and EtEOGE exhibited a complex thermoresponsive behavior due to its ability to form a micellar aggregate.
Type: article (author version)
Appears in Collections:工学院・工学研究院 (Graduate School of Engineering / Faculty of Engineering) > 雑誌発表論文等 (Peer-reviewed Journal Articles, etc)

Submitter: 磯野 拓也

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