Synthesis and thermoresponsive property of end-functionalized poly(N-isopropylacrylamide) with pyrenyl group

Duan, Qian; Miura, Yutaka; Narumi, Atsushi; Shen, Xiande; Sato, Shin-Ichiro; Satoh, Toshifumi; Kakuchi, Toyoji

Synthesis and thermoresponsive property of end-functionalized poly(N-isopropylacrylamide) with pyrenyl group

Duan, Qian; Miura, Yutaka; Narumi, Atsushi et al.

Journal of Polymer Science Part A: Polymer Chemistry, 2006, 44(3), 1117-1124

Permalink : https://hdl.handle.net/2115/5812

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アクセス権	open access
URI	https://hdl.handle.net/2115/5812
タイトル	Synthesis and thermoresponsive property of end-functionalized poly(N-isopropylacrylamide) with pyrenyl group
著者	Duan, Qian ; Miura, Yutaka ; Narumi, Atsushi ; Shen, Xiande ; Sato, Shin-Ichiro ; Satoh, Toshifumi ; Kakuchi, Toyoji
著者名 Duan, Qian
著者名 Miura, Yutaka
著者名 Narumi, Atsushi
著者名 Shen, Xiande
e-Rad_Researcher 10262601 著者名 Sato, Shin-Ichiro
e-Rad_Researcher 80291235 著者名 Satoh, Toshifumi
e-Rad_Researcher 80113538 著者名 Kakuchi, Toyoji 覚知, 豊次
言語	英語
キーワード	aggregation
	atom transfer radical polymerization (ATRP)
	cyclodextrin
	inclusion complex
	poly(N-isopropylacrylamide)
発行日	2006-02-01
出版者	Wiley Periodicals, Inc., A Wiley Company
収録物名	Journal of Polymer Science Part A: Polymer Chemistry
巻(号)	44(3)
ページ	1117-1124
抄録	N-Isopropylacrylamide (NIPAM) was polymerized using 1-pyrenyl 2-chloropropionate (PyCP) as the initiator and CuCl/tris[2-(dimethylamino)ethyl]amine (Me6TREN) as the catalyst system. The polymerizations were performed using the feed ratio of [NIPAM]0/[PyCP]0/[CuCl]0/[Me6TREN]0 = 50/1/1/1 in DMF/water of 13/2 at 20 ｰC to afford an end-functionalized poly(N-isopropylacrylamide) with the pyrenyl group (Py-PNIPAM). The characterization of the Py-PNIPAM using matrix-assisted laser desorption ionization time-of-flight mass spectrometry provided the number-average molecular weight (Mn,MS). The lower critical solution temperature (LCST) for the liquid-solid phase transition was 21.7, 24.8, 26.5, and 29.3 ｰC for the Py-PNIPAMs with the Mn,MS's of 3000, 3400, 4200, and 5000, respectively; hence, the LCST was dramatically lowered with the decreasing Mn,MS. The aqueous Py-PNIPAM solution below the LCST was characterized using a static laser light scattering (SLS) measurement to determine its molar mass, Mw,SLS. The aqueous solutions of the Py-PNIPAMs with the Mn,MS's of 3000, 3400, 4200, and 5000 showed the Mw,SLS of 586,000, 386,000, 223,000, and 170,000, respectively. Thus, lowering the LCST for Py-PNIPAM should be attributable to the formation of the PNIPAM aggregates. The LCST of 21.7 ｰC for Py-PNIPAM with the Mn,MS of 3000 was effectively raised by adding β-cyclodextrin (β-CD) and reached the constant value of 26 ｰC above the molar ratio of [β-CD]/[Py-PNIPAM] = 2/1, suggesting that β-CD formed an inclusion complex with pyrene in the chain-end to disturb the formation of PNIPAM aggregates, thus raising the LCST.
資源タイプ	学術雑誌論文
出版タイプ	Accepted Manuscript
権利情報	Copyright © 2006 John Wiley & Sons, Inc., JOURNAL OF POLYMER SCIENCE PART A-POLYMER CHEMISTRY, vol.44-3, p. 1117-1124
PISSN	0887-624X
関連情報	URI http://www.interscience.wiley.com/
関連情報 (isVersionOf)	出版社版DOI https://doi.org/10.1002/pola.21208