|
Hokkaido University Collection of Scholarly and Academic Papers >
Graduate School of Engineering / Faculty of Engineering >
Peer-reviewed Journal Articles, etc >
Synthesis and thermoresponsive property of end-functionalized poly(N-isopropylacrylamide) with pyrenyl group
Title: | Synthesis and thermoresponsive property of end-functionalized poly(N-isopropylacrylamide) with pyrenyl group |
Authors: | Duan, Qian Browse this author | Miura, Yutaka Browse this author | Narumi, Atsushi Browse this author | Shen, Xiande Browse this author | Sato, Shin-Ichiro Browse this author →KAKEN DB | Satoh, Toshifumi Browse this author →KAKEN DB | Kakuchi, Toyoji7 Browse this author →KAKEN DB |
Authors(alt): | 覚知, 豊次7 |
Keywords: | aggregation | atom transfer radical polymerization (ATRP) | cyclodextrin | inclusion complex | poly(N-isopropylacrylamide) |
Issue Date: | 1-Feb-2006 |
Publisher: | Wiley Periodicals, Inc., A Wiley Company |
Journal Title: | Journal of Polymer Science Part A: Polymer Chemistry |
Volume: | 44 |
Issue: | 3 |
Start Page: | 1117 |
End Page: | 1124 |
Publisher DOI: | 10.1002/pola.21208 |
Abstract: | 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. |
Rights: | Copyright © 2006 John Wiley & Sons, Inc., JOURNAL OF POLYMER SCIENCE PART A-POLYMER CHEMISTRY, vol.44-3, p. 1117-1124 |
Relation: | http://www.interscience.wiley.com/ |
Type: | article (author version) |
URI: | http://hdl.handle.net/2115/5812 |
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
|