Ammoxidation of cellulose—a structural study

Cagniant, D.; Magri, Pierre; Grüber, R.; Berłożecki, Stanisław; Salbut, P. D.; Bimer, J.; Nanse, G.

doi:10.1016/s0165-2370(01)00172-3

Cited by 28 publications

(15 citation statements)

References 37 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…The formation of imines has been observed in other reactions of cellulosic materials, such as the treatment of wood with liquid ammonia,25 the ammoxidation of cellulose,14 and the reaction of dialdehyde cellulose with nitrogen compounds 26…”

Section: Discussionmentioning

confidence: 95%

“…In spite of the wide use of polyethylenimines in the manufacturing of cellulosic materials, the chemical interaction of PEIs with cellulose has been scarcely studied to the present. However, it is known that celluloses can react, in the appropriate conditions, with several amino compounds 14–16. Another related reaction between reducing sugars and amino compounds such as amino acids or proteins, usually referred to as the Maillard reaction, plays a fundamental role in medicine and food technology and has been extensively studied 17–19.…”

Section: Introductionmentioning

confidence: 99%

See 1 more Smart Citation

Spectroscopic study of the modification of cellulose with polyethylenimines

Orden

Matias

Urreaga

2004

J of Applied Polymer Sci

View full text Add to dashboard Cite

ABSTRACT:The reaction of cellulose with polyethylenimines (PEIs) was studied using diffuse reflectance ultraviolet-visible (UV-vis) spectroscopy, diffuse reflectance FTIR spectroscopy, and standard colorimetry. PEIs were applied from aqueous solutions at the natural pH (pH ϳ 11) and at pH ϭ 6. The obtained materials were exposed to different thermal treatments in air. Celluloses treated at pH ϭ 11 suffer the reversible formation of amine bicarbonate salts. This reaction was not observed in celluloses treated at pH ϭ 6 because of the protonation of the amine groups. In all treated celluloses, the PEI amine groups reacted with cellulose carbonyl groups at moderate temperatures to form Schiff bases, which were responsible for the yellowing of the material. At higher temperatures other oxidation products were detected in the UV-vis and infrared spectra.

show abstract

Section: Discussionmentioning

confidence: 95%

Section: Introductionmentioning

confidence: 99%

Spectroscopic study of the modification of cellulose with polyethylenimines

Orden

Matias

Urreaga

2004

J of Applied Polymer Sci

View full text Add to dashboard Cite

show abstract

“…Moreover, it is well known in the literature that conversion of carbonaceous materials containing no pyridinic groups (e.g. cellulose) to pyridinic nucleiis supposed to occur at temperature higher than 250 • C in presence of gaseous NH 3 (Cagniant et al, 2002). Therefore, the possible N-containing chemical groups are attributed mainly to neutral amine and/or amide since both functions could have their binding energy in the range around 399.9 eV.…”

Section: Xps Analysismentioning

confidence: 99%

“…Regarding imine groups, only traces could be present if we consider their classical binding energy around 398.5 eV. They could more significantly be present by considering their assignment at 399.0 ± 0.1 eV as performed by Cagniant et al (2002) by coupling XPS and IR spectroscopies for ammonia-treated cellulose at low temperature (250 • C). In that case, these data appear in agreement with the previous characterization of EAT (Braghiroli et al, 2013) where multiamination of phenolic hydroxyl groups with formation of bridging C N group and oxidation of phenolic-OH groups to quinone were observed.…”

Section: Xps Analysismentioning

confidence: 99%

See 1 more Smart Citation

High surface – Highly N-doped carbons from hydrothermally treated tannin

Braghiroli

Fierro

Izquierdo

et al. 2015

Industrial Crops and Products

View full text Add to dashboard Cite

a b s t r a c tNitrogen-doped carbon materials (NCMs) were obtained by amination of tannin by hydrothermal carbonisation (HTC). NCMs presented different morphologies depending on the amination method: (i) powders by HTC of tannin in a concentrated aqueous ammonia solution; (ii) gels without using any crosslinker by HTC in distilled water of tannin first dissolved in concentrated ammonia and then evaporated. Whatever the method, (i) or (ii), HTC was carried out at different temperatures: 180, 190, 200, 210 or 220 • C, with further pyrolysis at 900 • C under nitrogen. The morphology and chemical composition of the resultant materials were discussed. We compared our results with those reported in the open literature and we concluded that HTC of tannin in a concentrated aqueous ammonia solution allowed obtaining outstanding materials because they have both surface areas, higher than 500 m 2 g −1 , and high N content, around 8 wt.%.

show abstract

Flame‐retardant effect of polyaniline coating deposited on cellulose fibers

Stejskal

Trchová

Sapurina

2005

J of Applied Polymer Sci

View full text Add to dashboard Cite

Filtration paper was coated with a thin polyaniline film. The content of conducting polymer was 8.2 and 6.3 wt % for polyaniline hydrochloride and polyaniline base, respectively. After burning, the coated material retains the original fibrilar morphology of cellulose. The polyaniline coating converts to solid carbonaceous products. The resulting structure prevents the formation of gaseous carbon oxides by restricting the access of oxygen to cellulose. While the ash from the uncoated paper after burning is 0.005 wt %, the microtubular residue of polyaniline-coated paper is 16 -24 wt % of the original mass. The flame-retardant performance of polyaniline and poly(1,4-phenylenediamine) coatings was comparable both for the protonated forms and the corresponding bases. The conversion of polyanilinecoated cellulose fibers to solid pyrolytic products was characterized by FTIR and Raman spectroscopies.

show abstract

Ammoxidation of cellulose—a structural study

Cited by 28 publications

References 37 publications

Spectroscopic study of the modification of cellulose with polyethylenimines

Spectroscopic study of the modification of cellulose with polyethylenimines

High surface – Highly N-doped carbons from hydrothermally treated tannin

Flame‐retardant effect of polyaniline coating deposited on cellulose fibers

Contact Info

Product

Resources

About