Abstract
Rotaxanes and pseudorotaxanes are the supramolecular objects that attract much attention due to their low toxicity, sliding, dethreading and easy modification. Thus, polyrotaxanes and polypseudorotaxanes can be considered as components in drug delivery systems, sensor devices, implants, contrasting agents, fluorescent probes in other diagnostic systems. Therefore, we have prepared the pseudorotaxanes based on the β-cyclodextrin (β-CD) and molecule-“guest”—polyoxypropylenedimethacrylate (POPDMA) as carrier of end-capped methacrylate groups. The presence of such groups allows pseudorotaxane to be co-polymerized with acrylamide and methylene-bis-acrylamide and to develop cross-linked polymer matrices, which implies their further investigation as systems for a drug release. The structure of these substances was confirmed by FTIR- and NMR-spectroscopy, differential scanning calorimetry (DSC), X-ray analysis [wide-angle X-ray scattering (WAXS)], pyrolysis mass spectrometry. The ratio of POPDMA to β-CD was found to be 1:3, according to NMR data. The interactions between β-CD and POPDMA in the aqueous solution and in the dry mechanical mixture are entirely different, due to formation of pseudorotaxane. The results obtained by pyrolysis mass-spectrometry, WAXS and DSC well correlate with mechanism of formation of inclusion complexes, involving a linear molecule and cyclodextrins as described earlier.
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Abbreviations
- β-CD:
-
β-Cyclodextrin
- MW:
-
Molecular weight
- MetA:
-
Methacrylic anhydride
- PPG:
-
Polyoxypropylene glycol
- ТЕА:
-
Triethylamine
- POPDMA:
-
Polyoxypropylenedimethacrylate
- WAXS:
-
Wide angle X-ray scattering
- DSC:
-
Differential scanning calorimetry
- TGA:
-
Thermogravimetric analysis
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LO was engaged in the synthesis of samples and their identification by NMR spectroscopy. LK performed studying of samples by DSC and TGA. SS elaborated and provided synthetic procedures for monomers and cross-linked polymers. VB carried out pyrolysis mass spectrometry research VD studied the samples by WAXS method and analyzed the data obtained. SR took part in the FT-IR, DCS and TGA investigations, summarized all data and wrote the manuscript. All authors read and approved the final manuscript.
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Orel, L., Kobrina, L., Sinelnikov, S. et al. β-Cyclodextrin-containing pseudorotaxanes as building blocks for cross-linked polymers. J Incl Phenom Macrocycl Chem 92, 273–280 (2018). https://doi.org/10.1007/s10847-018-0838-5
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DOI: https://doi.org/10.1007/s10847-018-0838-5