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α-Cyclodextrin/Polyethylene Glycol Polyrotaxane: A Study of the Threading Process
Abstract
Aqueous solutions of α-cyclodextrin (α-CD) and polyethylene glycol (PEG) form interesting complexes, where several α-CD units are penetrated by the linear polymeric PEG chain and produce a so-called “polyrotaxane”. This supramolecular structure is stabilized by strong interactions between the α-CD hydrophobic internal cavity and the −CH 2 OCH 2 − moieties of PEG. When cyclodextrins have occupied the whole PEG chain, the polyrotaxanes aggregate and precipitate, forming a thick solid gel. Turbidity measurements at λ = 400 nm were used to study the threading phenomenon. The temperature of the solution and the composition of the solvent affect the formation of polyrotaxanes in a significant way. We propose a molecular model to explain the experimental findings in terms of a multistep threading process. The Gibbs free energy related to the formation of polyrotaxanes is calculated according to the transition state theory.
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Citations
Cited by
Cyclodextrin Rotaxanes and Polyrotaxanes
Wenz, G., Han, B.-H., & Müller, A. (2006) · Chemical Reviews · doi:10.1021/cr970027+ · Cited by 1,243
Synthesis and applications of adsorbents containing cyclodextrins
Crini, G., & Morcellet, M. (2002) · Journal of Separation Science · doi:10.1002/1615-9314(20020901)25:13<789::aid-jssc789>3.0.co;2-j · Cited by 337
Self-Assembly of β-Cyclodextrin in Water. Part 1: Cryo-TEM and Dynamic and Static Light Scattering
Bonini, M., Rossi, S., Karlsson, G., Almgren, M., Lo Nostro, P., & Baglioni, P. (2006) · Langmuir · doi:10.1021/la052878f · Cited by 272
Self-citationSupramolecular Hybrid Hydrogel Based on Host–Guest Interaction and Its Application in Drug Delivery
Yu, J., Ha, W., Sun, J.-N., & Shi, Y.-P. (2014) · ACS Applied Materials & Interfaces · doi:10.1021/am505649q · Cited by 113
Metadata
- Authors
- Ceccato, M., Lo Nostro, P., & Baglioni, P.
- Venue
- Langmuir
- Publisher
- American Chemical Society (ACS)
- Published
- 1997-04-01
- Volume
- 13
- Issue
- 9
- Pages
- 2436-2439
- ISSN
- 0743-7463 (ISSN-L)
- 1520-5827
- OpenAlex
- W2047593678
- Cited by
- 192
- References
- 0
- FWCI
- 2.16
- Type
- journal article
- Language
- en
- Open access
- closed
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