Journal
POLYMER
Volume 53, Issue 14, Pages 2884-2889Publisher
ELSEVIER SCI LTD
DOI: 10.1016/j.polymer.2012.04.038
Keywords
High molecular weight polyrotaxanes; One-pot approach; Alkyl stoppers
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Funding
- National Natural Science Foundation of China [51173162, 20974093]
- Qianjiang Talent Foundation of Zhejiang Province [2010R10021]
- Fundamental Research Funds for the Central Universities [2011QNA4029]
- Research Fund for the Doctoral Program of Higher Education of China [20100101110049]
- Zhejiang Provincial Natural Science Foundation of China [R4110175]
- China Postdoctoral Science Foundation [20100471707]
- China Postdoctoral Science Special Foundation [201104716]
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An easy, one-pot, high-yield preparation of high molecular weight polyrotaxanes (PRs) from poly(ethylene glycol) (PEG) and alpha-cyclodextrin (alpha-CD) by click chemistry is presented with novel water soluble and clickable end-capping agents containing quaternary ammonium and propargyl groups. The threading numbers of alpha-CD on the PEG chain were investigated by means of H-1 NMR spectroscopy and gel permeation chromatography (GPC). When M-n of the PEG axis is 35 kDa, the yield is up to 614 mg per 100 mg PEG axis and the average number of alpha-CDs on each PEG axis is 193. Wide-angle X-ray diffraction (WAXD) revealed that PRs form a column-type crystalline structure. The prepared PR possesses terminal alkyne groups which can connect with functional molecules to make the PR more useful. As a typical example, fluorescent rhodamine B has been successfully installed on the PR terminals. (C) 2012 Elsevier Ltd. All rights reserved.
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