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Cellulose

, Volume 18, Issue 3, pp 607–617 | Cite as

Improving the reproducibility of chemical reactions on the surface of cellulose nanocrystals: ROP of ε-caprolactone as a case study

  • Marianne Labet
  • Wim Thielemans
Article

Abstract

In our group, we work on the surface modification of cellulose nanocrystals. During this work, we have encountered reproducibility issues when the same reactions were performed on nanocrystals from different hydrolysis batches, indicating a variable surface composition. Given the inherent purity of the nanoparticles themselves, this issue was believed to be due to the presence of adsorbed species at the surface of the nanocrystals blocking reactive sites. To investigate this in detail, nanocrystals from several batches were extracted with different solvents. The effect of these extractions on the surface composition of the nanowhiskers was investigated, followed by its effect on the Surface-Initiated Ring-Opening Polymerization (SI-ROP) of ε-caprolactone. The extracted impurities were analysed by NMR (1H and 13C) and MS, showing a variety of adsorbed species which can be removed by solvent extraction. A Soxhlet extraction using ethanol before the reaction was shown to be the most effective in removing adsorbed low molecular weight organic compounds produced during the hydrolysis, resulting in improved reproducibility between reactions using nanocrystals from different batches, as confirmed by FTIR, elemental analysis and XPS. Extraction with ethanol should thus be performed before all reaction as these adsorbed species can be expected to interfere with all surface modification reactions.

Keywords

Cotton nanocrystals Nanowhiskers Ring-Opening Polymerization (ROP) Surface-Initiated Polymerization (SIP) Polycaprolactone (PCL) Grafting from Purification Ethanol Soxhlet extraction 

Notes

Acknowledgment

Financial support for this work was provided by the EPSRC (Engineering and Physical Sciences Research Council) as part of the DICE (Driving Innovation Chemistry and Chemical Engineering) science and innovation award (Grant EP/D501229/1). The authors thank Nacho Villar and Emily Smith for the XPS analyses and Tong Liu (School of Chemistry, University of Nottingham) for the Elemental Analysis measurements.

Supplementary material

10570_2011_9527_MOESM1_ESM.doc (228 kb)
Supplementary material 1 (DOC 228 kb)

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Copyright information

© Springer Science+Business Media B.V. 2011

Authors and Affiliations

  1. 1.School of Chemistry, Faculty of ScienceUniversity ParkNottinghamUK
  2. 2.Process and Environmental Research Division, Faculty of EngineeringUniversity ParkNottinghamUK

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