Synthesis and thermoresponsive property of end-functionalized poly(N-isopropylacrylamide) with pyrenyl group
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概要
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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.
- Wiley Periodicals, Inc., A Wiley Companyの論文
- 2006-02-01
著者
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佐藤 敏文
北海道大学大学院工学研究科
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Kakuchi T
Division Of Bioscience Graduate School Of Environmental Earth Science Hokkaido University
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Kakuchi T
Hokkaido Univ. Sapporo Jpn
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佐藤 敏文
Division Of Biotechnology And Macromolecular Chemistry Graduate School Of Engineering Hokkaido Unive
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佐藤 敏文
北海道大学大学院工学研究科生物機能高分子専攻
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Miura Yutaka
Division Of Biotechnology And Macromolecular Chemistry Graduate School Of Engineering Hokkaido Unive
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覚知 豊次
Division Of Biotechnology And Macromolecular Chemistry Graduate School Of Engineering Hokkaido Unive
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Satoh Toshifumi
Division Of Biotechnology And Macromolecular Chemistry Graduate School Of Engineering Hokkaido Unive
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Sato Shin-ichiro
Division Of Biotechnology And Macromolecular Chemistry Graduate School Of Engineering Hokkaido Unive
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Narumi Atsushi
Department Of Polymer Science And Engineering Graduate School Of Science And Engineering Yamagata Un
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Kakuchi Toyoji
Division Of Biotechnology And Macromolecular Chemistry Graduate School Of Engineering Hokkaido Unive
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Narumi Atsushi
Department Of Polymer Science And Engineering Graduate School Of Science And Engineering Yamagata Un
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Shen Xiande
Division of Biotechnology and Macromolecular Chemistry, Graduate School of Engineering, Hokkaido University
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Duan Qian
Division of Biotechnology and Macromolecular Chemistry, Graduate School of Engineering, Hokkaido University
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