The investigation of the influence of water and temperature on the LiCl/DMAc/cellulose system

Chrapava, Sarka; Touraud, Didier; Rosenau, Thomas; Potthast, Antje; Kunz, Werner

doi:10.1039/b212665f

Cited by 66 publications

(40 citation statements)

References 26 publications

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“…Aggregates can also arise from the presence of water in the solvent system. It has been shown that as soon as more than two water molecules per LiCl molecule are present in solution, the concentration of the salt is not sufficient for a good dissolution of cellulose [40]. The effect of water was found to be more pronounced on dilute solutions (SEC concentration), where within one day, 0.05 M of water can lead to considerable increase in the measured hydrodynamic radius [41].…”

Section: Hypothesismentioning

confidence: 97%

Comparative evaluation of size-exclusion chromatography and viscometry for the characterisation of cellulose

Dupont

Mortha²

2004

Journal of Chromatography A

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Section: Hypothesismentioning

confidence: 97%

Comparative evaluation of size-exclusion chromatography and viscometry for the characterisation of cellulose

Dupont

Mortha²

2004

Journal of Chromatography A

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“…25,28,29 Kessick and Tepper 27 have reported the formation of nanofibers of carboxymethyl cellulose sodium salt (CMC). A lowconcentration CMC solution (0.01%) was sprayed into positively and negatively charged droplets using electrospraying.…”

Section: Introductionmentioning

confidence: 99%

Electrospinning of cellulose‐based nanofibers

Frenot¹,

Henriksson²,

Walkenström³

2006

J of Applied Polymer Sci

212

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Cellulose derivatives of carboxymethyl cellulose sodium salt (CMC), hydroxypropyl methylcellulose (HPMC), methylcellulose (MC), and enzymatically treated cellulose have been electrospun, and the microstructure of the resulting nanofibers has been analyzed by scanning electron microscopy (SEM). Before electrospinning, the solutions were characterized by viscometry and surface tension measurements, and the results were correlated with spinnability. Four different CMC derivatives, varying in molecular weight (M w ), degree of substitution (DS), and substitution pattern, have been electrospun in mixtures with poly(ethylene oxide) (PEO), and nanofibers of various characteristics have formed. The CMC-based nanostructures, i.e., the nonwoven sheet and individual nanofibers, proved to be independent of M w and DS but largely dependent on the substitution pattern. The nonwoven sheets varied in homogeneity, and beads appeared on the individual fibers. Depending on the chemical nature of the CMC, the extraction of PEO resulted in pure CMC nanostructures of varying appearance, indicating that the distribution of PEO and CMC in the nanofibers also varied. Two different HPMC derivatives, varying in DS, were electrospun into nanofibers. Homogeneous nonwoven sheets based on nanofibers of similar appearance are formed, independent of the substitution content of the HPMC sample. Preliminary fibers were obtained from enzymatically treated cellulose in a solvent system based on lithium chloride dissolved in dimethyl acetamide (LiCl : DMAc).

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“…For example, for LiCl/DMAc, cellulose solutions with various water contents were observed with polarised optical microscopy allowing detecting water composition at which a clear isotropic solution starts to contain birefringent non-dissolved particles (Chrapava et al 2003). The maximum water content in the isotropic state was 3 wt% (the ratio between water and LiCl being 2:1) this value depending on cellulose concentration.…”

Section: Introductionmentioning

confidence: 99%

Influence of water on cellulose-EMIMAc solution properties: a viscometric study

Sescousse

Budtova

2011

Cellulose

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International audienceThe influence of water on cellulose dissolved in 1-ethyl-3-methylimidazolium acetate (EMIMAc) is analysed by measuring steady state viscosity of dilute solutions. The goal is to determine: (a) the maximal water content allowing keeping cellulose dissolved (in dilute regime) and (b) the influence of water on solution flow and cellulose hydrodynamic properties. Mixing EMIMAc and water is exothermal and EMIMAc-water viscosity does not obey a logarithmic mixing rule suggesting strong interactions between the components. Newtonian flow of cellulose-EMIMAc-water solutions was recorded at water concentrations below 15 wt% and a shear thinning was observed for higher water content. It was suggested that above 15 wt% water cellulose is not completely dissolved: swollen aggregates form a sort of a "suspension" which is structuring under shear. Cellulose intrinsic viscosity showed a peak at 10 wt% water-90 wt% EMIMAc. It was hypothesised that the addition of water leads to the formation of large cellulose aggregates due to the preferential cellulose-cellulose interaction

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The investigation of the influence of water and temperature on the LiCl/DMAc/cellulose system

Cited by 66 publications

References 26 publications

Comparative evaluation of size-exclusion chromatography and viscometry for the characterisation of cellulose

Comparative evaluation of size-exclusion chromatography and viscometry for the characterisation of cellulose

Electrospinning of cellulose‐based nanofibers

Influence of water on cellulose-EMIMAc solution properties: a viscometric study

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