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

  title={Improving the reproducibility of chemical reactions on the surface of cellulose nanocrystals: ROP of $\epsilon$-caprolactone as a case study},
  author={Marianne Labet and Wim Thielemans},
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… 

Surface characteristics of cellulose nanoparticles grafted by surface-initiated ring-opening polymerization of ε-caprolactone

Abstract In this study, surface-initiated ring-opening polymerization has been employed for the grafting of ε-caprolactone from cellulose nanoparticles, made by partial hydrolysis of cellulose cotton

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This work is the first to demonstrate that the efficiency of surface polymerization and final product properties are in fact influenced by the protocols, by installing a standard polymer onto the surface of both freeze-dried and solvent-exchanged CNCs by ring-opening polymerization (ROP).

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This review analyses the type of cellulose nanocrystal modification reactions that have been published in the literature thus far and looks at the steps taken towards analysing the products of the nanocrystals modifications.

Citric acid as a benign alternative to metal catalysts for the production of cellulose-grafted-polycaprolactone copolymers

Monocrystalline cellulose nanocrystals (nanowhiskers), prepared by acid hydrolysis of cotton wool followed by Soxhlet extraction in ethanol to remove adsorbed impurities, were modified with

Surface-initiated ring-opening polymerization from cellulose model surfaces monitored by a Quartz Crystal Microbalance

Polymer surface-grafting is an excellent method to modify the properties of a surface. However, surface-initiated polymerization is still relatively poorly understood due to the lack of appropriate

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Oligosaccharide-coated CNCs demonstrated subtle changes including higher surface charge densities and lower water adsorption capacities and viscosities than their unmodified counterparts.

Graft polymerization of ε-caprolactone to cellulose nanocrystals and optimization of grafting conditions utilizing a response surface methodology

The objective of this study was the grafting, statistical polymerization optimization, and subsequent characterization of poly(ε-caprolactone)grafted cellulose nanocrystals (CNCs) obtained by ring

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In this communication, a method for the grafting of amine-terminated monomers onto surface-modified CNCs followed by click chemistry is demonstrated demonstrating a degree of molecular control for creating these structures at the nano level.

Cellulose nanocrystals grafted with polystyrene chains through surface-initiated atom transfer radical polymerization (SI-ATRP).

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Bionanocomposites based on poly(ε-caprolactone)-grafted cellulose nanocrystals by ring-opening polymerization

A ‘grafting from’ approach was used to graft poly(e-caprolactone) (PCL) polymers to cellulose nanocrystals by Sn(Oct)2-catalyzed ring-opening polymerization (ROP). The grafting efficiency was

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The surface of cellulose nanocrystals, prepared by sulfuric acid hydrolysis of cotton, was rendered cationic through a reaction with epoxypropyltrimethylammonium chloride. The resultant nanocrystal

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Highly filled bionanocomposites from functionalized polysaccharide nanocrystals.

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Cellulose nanocrystals: chemistry, self-assembly, and applications.

Dr. Youssef Habibi’s research interests include the sustainable production of materials from biomass, development of high performance nanocomposites from lignocellulosic materials, biomass conversion technologies, and the application of novel analytical tools in biomass research.

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This critical review summarises the different conditions which have been described to synthesise PCL, and gives a broad overview of the different catalytic systems that were used (enzymatic, organic and metal catalyst systems).

Polymer grafting onto starch nanocrystals.

Monocrystalline starch nanoparticles were successfully grafted with poly(tetrahydrofuran), poly(caprolactone), and poly(ethylene glycol) monobutyl ether chains using toluene 2,4-diisocyanate as a linking agent and grafting efficiency decreased with the length of the polymeric chains, as expected.