Readily hydrolysable cellulose esters as intermediates for the regioselective derivatization of cellulose; II. Soluble, highly substituted cellulose trifluoroacetates

Liebert, Tim; Schnabelrauch, Matthias; Klemm, Dieter; Erler, U.

doi:10.1007/bf00812508

Cited by 38 publications

(31 citation statements)

References 10 publications

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“…A lot of methods have been proposed for the acylation of cellulose (Samaranayake and Glasser 1993;Liebert et al 1994;Heinze and Lebert 2001;Gra¨bner et al 2002;Sealey et al 2003), and among the different reagent used; acid chloride and acid anhydride are the most applied (Samaranayake and Glasser 1993) in both heterogeneous and homogeneous media. In the present work we adopt the heterogeneous route to carry out the acylation reaction for two reasons, (i) It reduces the cost of the modified substrate, and (ii) It preserves the microporous structure of the fibres, allowing the generation of a high grafting density and, thus, favouring the formation of hydrophobic domains.…”

Section: Resultsmentioning

confidence: 99%

Modified cellulose fibres for adsorption of dissolved organic solutes

Boufi

Belgacem²

2006

Cellulose

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Cellulose fibres were grafted with aliphatic anhydrides having C6, C8, C12 and C16 chain length using a heterogeneous solvent exchange acylation procedure. The ensuing materials were fully characterised by FTIR, solid state 13 C-NMR, Wide-angle X-ray scattering and contact angle measurements. These techniques showed that the chemical coupling has indeed occurred. The prepared modified fibres appeared to be efficient to trap different organic molecules dissolved in water. Recycling tests revealed that the saturated substrates could be regenerated tens of times without loosing their capacity of absorption of organic contaminants.

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Section: Resultsmentioning

confidence: 99%

Modified cellulose fibres for adsorption of dissolved organic solutes

Boufi

Belgacem²

2006

Cellulose

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“…Via this path, the introduction of the more reactive trifluoroacetyl function would be possible without the presently used highly corrosive and low boiling trifluoroacetic acid and trifluoroacetic anhydride. [16] …”

Section: Resultsmentioning

confidence: 99%

Interactions of Ionic Liquids with Polysaccharides 1. Unexpected Acetylation of Cellulose with 1‐Ethyl‐3‐methylimidazolium Acetate

Köhler

Liebert

Schöbitz

et al. 2007

Macromol. Rapid Commun.

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116

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The homogeneous conversion of cellulose in the ionic liquid 1‐ethyl‐3‐methylimidazolium acetate with 2‐furoyl chloride, p‐toluenesulfonyl chloride, and triphenylmethyl chloride yields surprisingly pure cellulose acetate samples in any case. From NMR spectroscopic studies, it may be concluded that during the homogeneous functionalization reactive intermediates including furane‐2‐carboxylic acid/acetic acid anhydride and acetic acid triphenylmethyl ester are formed leading to the cellulose acetates with DS values in the range from 0.55 to 1.86.magnified image

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“…The modification of cellulose fibers with fluorine-containing compounds using different procedures has attracted attention in recent years because of the peculiar properties imparted by this type of functionalization, in particular the enhanced lipophobicity/hydrophobicity of the ensuing surfaces [12][13][14][15][16][17][18][19][20][21]. Our ongoing interest in this type of modification includes two types of reagents as a function of the desired application, viz.…”

Section: Introductionmentioning

confidence: 99%