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Synthesis and thermoresponsive properties of four-arm star-shaped poly(N-isopropylacrylamide)s bearing covalent and non-covalent cores

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Title: Synthesis and thermoresponsive properties of four-arm star-shaped poly(N-isopropylacrylamide)s bearing covalent and non-covalent cores
Authors: Chen, Yougen Browse this author
Xiao, Nao Browse this author
Fukuoka, Moe Browse this author
Yoshida, Kohei Browse this author
Duan, Qian Browse this author
Satoh, Toshifumi Browse this author
Kakuchi, Toyoji Browse this author →KAKEN DB
Issue Date: 2015
Publisher: The Royal Society of Chemistry
Journal Title: Polymer chemistry
Volume: 6
Issue: 19
Start Page: 3608
End Page: 3616
Publisher DOI: 10.1039/c5py00277j
Abstract: The present study describes the precise synthesis and thermoresponsive properties of two types of four-arm star-shaped poly(N-isopropylacrylamide)s (PNIPAM), i.e., the covalently linked one (3) and the non-covalently Ru(II)-chelated one (5). The atom transfer radical polymerization (ATRP) method was used to prepare the azido-terminated PNIPAM (1) arm using (2-azidoethyl)-2-chloropropionamide (AECP) as the initiator. 3 was subsequently prepared based on the click reaction of 1 with a multifunctional linker of tetra[(5-hexynyloyloxy)methyl]methane. For comparison, its linear counterpart 2 was also synthesized as a reference polymer by the same method using ethyl 5-hexynyloate. The four-arm star-shaped PNIPAM Ru complex 5, on the other hand, was prepared by a click-to-chelate approach, which involves the click reaction of 1 with 2,6-diethynylpyridine to produce the macroligand of 2,6-bis(1-PNIPAM-1,2,3-triazol-4-yl) pyridine (4) and the chelating reaction of RuCl3 with 4 to afford 5. The thermoresponsive properties of the resulting polymers were investigated using a UV-vis spectrophotometer by measuring the optical transmittance of the polymer solution with varying solution temperature and the cloud point (T-c) at 50% transmittance intensity in order to assess their thermoresponsive properties. The detailed thermoresponsive properties of these polymers, including the effects of the polymer terminal and core linkage and constituents of the four-arm star-shaped PNIPAMs on the T-c, are significantly described in the later part of this study.
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: 覺知 豊次

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