Reactivity of sulphur-free alkali lignins within starch films

Lepifre, S.; Baumberger, Stéphanie; Pollet, Brigitte; Cazaux, Frédéric; Coqueret, Xavier; Lapierre, Catherine

doi:10.1016/j.indcrop.2004.04.023

Cited by 36 publications

(28 citation statements)

References 26 publications

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“…Sugar content was determined after a two-step hydrolysis procedure of lignin samples on the basis of the method documented by Lepifre et al 33 The lignin samples (between 6 and 15 mg) were weighed directly into a screw cap tube to which 125 lL of a solution 13M H 2 SO 4 was added. The reaction mixture was left for 1 h at 258C and regularly crushed with a glass stick placed in the tube.…”

Section: Sugar Determinationmentioning

confidence: 99%

Lignins as macromonomers for polyurethane synthesis: A comparative study on hydroxyl group determination

Cateto

Barreiro

Rodrigues

et al. 2008

J of Applied Polymer Sci

127

112

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The hydroxyl group contents of four technical lignins [Indulin AT (Meadwestvaco), Alcell (Repap), Curan 27‐11P (Borregaard LignoTech), and Sarkanda (Granit SA)] were investigated in view of their valorization as polyols in polyurethane synthesis. The different hydroxyl group contents were determined by the following methods: titration and 1H‐NMR, 13C‐NMR, and 31P‐NMR spectroscopy. The titration method chosen was on the basis of a standard method commonly used to characterize commercial polyols for polyurethanes synthesis. The values of the total and phenolic hydroxyl contents determined by the different techniques were found to be in good agreement. For the total hydroxyl contents, coefficients of variation of 5.6% (Alcell), 3.2% (Indulin AT), 2.3% (Sarkanda), and 6.2% (Curan 27‐11P) were established. For the phenolic hydroxyl contents, a good correlation was observed between data obtained from 31P‐NMR and 13C‐NMR for all lignin samples, except for the Sarkanda lignin, for which a relatively high coefficient of variation (12.6%) was found. For softwood lignins (Indulin AT and Curan 27‐11P), the phenolic hydroxyl content determined by 1H‐NMR was always lower than that deduced from 31P‐NMR and 13C‐NMR spectroscopy. © 2008 Wiley Periodicals, Inc. J Appl Polym Sci, 2008

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Section: Sugar Determinationmentioning

confidence: 99%

Lignins as macromonomers for polyurethane synthesis: A comparative study on hydroxyl group determination

Cateto

Barreiro

Rodrigues

et al. 2008

J of Applied Polymer Sci

127

112

View full text Add to dashboard Cite

show abstract

“…Moreover, kraft lignin was esterified and was used to prepare starch‐lignin composite films . Lepifre et al compared the reactivities of films of three soda lignins with starch after exposing them to electron‐beam radiations. Besides its traditional use as polymer reinforcement, lignin finds applications as an antioxidant in composite films, due to its complex phenolic nature .…”

Section: Introductionmentioning

confidence: 99%

Synthesis and characterization of cross‐linked starch/lignin film

Shi

2016

Starch Stärke

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A cross‐linked film, based on corn starch/hydroxymethylated alkali lignin, was prepared. The effects of solution casting, pH, and reactant stoichiometries on water absorbability and mechanical properties of the starch/lignin film were studied. The microstructure, morphology, moisture absorbability, and thermal properties of the film were also evaluated. Results showed that the starch/lignin composite film, cast under optimized conditions, was homogeneous and soft. The tensile strength and elongation ratio of the composite film were higher than that of the corn starch film. At a temperature, higher than 320°C, the weight loss rate of the starch/lignin film was lower than that of the starch film and its char residue at 750°C was more than the corn starch film. This showed that the starch/lignin film had better thermal stability at higher temperatures. More importantly, the water absorption rate of starch/lignin film was 238 ± 3 %, which was 1.3 times than that of the corn starch film. The moisture content of the film was also higher than the corn starch sample. Hence, the prepared starch/lignin cross‐linked film can be used as a biodegradable, water absorbent material for packaging and in agricultural mulching.

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“…This in turn, may result in condensation of lignin molecules, grafting onto amylose or amylopectin, and cross-linking of starch molecules. One or more of these proposed mechanisms may also be accountable for increased hydrophobicity of starch-lignin fi lms after irradiation (Lepifre et al ., 2004b).…”

Section: Case Studies: Starchmentioning

confidence: 99%

Electron beam processing to improve the functionality of biodegradable food packaging

Zivanovic

2015

Electron Beam Pasteurization and Complementary Food Processing Technologies

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Reactivity of sulphur-free alkali lignins within starch films

Cited by 36 publications

References 26 publications

Lignins as macromonomers for polyurethane synthesis: A comparative study on hydroxyl group determination

Lignins as macromonomers for polyurethane synthesis: A comparative study on hydroxyl group determination

Synthesis and characterization of cross‐linked starch/lignin film

Electron beam processing to improve the functionality of biodegradable food packaging

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