NDLI: Synthesis of polyrotaxanes from acetyl-β-cyclodextrin

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Synthesis of polyrotaxanes from acetyl-β-cyclodextrin

Content Provider	Springer Nature Link
Author	Ristić, I. S. Nikolić, L. Nikolić, V. Ilić, D. Budinski Simendić, J.
Copyright Year	2011
Abstract	Polyrotaxanes are intermediary products in the synthesis of topological gels. They are created by inclusion complex formation of hydrophobic linear macromolecules with cyclodextrins or their derivatives. Then, pairs of cyclodextrin molecules with covalently linkage were practically forming the nodes of the semi-flexible polymer network. Such gels are called topological gels and they can absorb huge quantities of water due to the net flexibility allowing the poly(ethylene oxide) chains to slide through the cyclodextrin cavities, without being pulled out altogether. For polyrotaxane formation poly(ethylene oxide) was used like linear macromolecules. There are hydroxyl groups at poly(ethylene oxide) chains, whereby the linking of the voluminous molecules should be made. To avoid the reaction of cyclodextrin OH groups with stoppers, they should be protected by, e.g., acetylation. In this work, the acetylation of the OH groups of β-cyclodextrin was performed by acetic acid anhydride with iodine as the catalyst. The acetylation reaction was assessed by the FTIR and HPLC method. By the HPLC analysis was found that the acetylation was completed in 20 minutes. Inserting of poly(ethylene oxide) with 4000 g/mol molecule mass into acetyl-β-cyclodextrin with 2:1 poly(ethylene oxide) monomer unit to acetyl-β-cyclodextrin ratio was also monitored by FTIR, and it was found that the process was completed in 12 h at the temperature of 10°C. If the process is performed at temperatures above 10°C, or for periods longer than 12 hours, the process of uncontrolled hydrolysis of acetate groups was initiated.
Starting Page	2264
Ending Page	2269
Page Count	6
File Format	PDF
ISSN	00360244
Journal	Russian Journal of Physical Chemistry
Volume Number	85
Issue Number	13
e-ISSN	1531863X
Language	English
Publisher	SP MAIK Nauka/Interperiodica
Publisher Date	2011-12-09
Publisher Place	Dordrecht
Access Restriction	One Nation One Subscription (ONOS)
Subject Keyword	cyclodextrin acetylation polyrotaxanes supramolecular polymer Physical Chemistry
Content Type	Text
Resource Type	Article
Subject	Physical and Theoretical Chemistry

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