LGP2 Laboratory of Pulp and Paper Science

Sainte-Foy-lès-Lyon, France

LGP2 Laboratory of Pulp and Paper Science

Sainte-Foy-lès-Lyon, France

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Missoum K.,LGP2 Laboratory of Pulp and Paper Science | Belgacem M.N.,LGP2 Laboratory of Pulp and Paper Science | Barnes J.-P.,CEA Grenoble | Brochier-Salon M.-C.,LGP2 Laboratory of Pulp and Paper Science | Bras J.,LGP2 Laboratory of Pulp and Paper Science
Soft Matter | Year: 2012

The present study reports for the first time the heterogeneous surface modification of nanofibrillated cellulose (NFC) in ionic liquid using different anhydride molecules. With ecofriendly perspectives in mind, the ionic liquid used was recycled by liquid-liquid extraction. The purity of the recycled IL was confirmed by FTIR measurements and NMR spectra of 1H, 13C, 31P and 19F. All the NFC samples were characterized by different techniques (e.g. FTIR, contact angle measurements) to check the efficiency of grafting and to compare the influence of the different anhydrides used. The surface chemical grafting obtained was effective. The Degree of Substitution (DS) was determined by elemental analysis and the Degree of Surface Substitution (DSS) was calculated from X-ray photoelectron spectroscopy data. ToF-SIMS was used to characterize the grafting at the extreme surface. © 2012 The Royal Society of Chemistry.


Marrakchi Z.,LGP2 Laboratory of Pulp and Paper Science | Marrakchi Z.,Research Unity of Applied Chemistry and Environment | Oueslati H.,Research Unity of Materials Environment and Energy | Belgacem M.N.,LGP2 Laboratory of Pulp and Paper Science | And 2 more authors.
Composites Part A: Applied Science and Manufacturing | Year: 2012

To the best of our knowledge, this is the first report of combining alfa fibres with polycaprolactone (PCL) and using impregnation as a processing technique. Alfa fibres were used to prepare films that were impregnated with PCL solutions in order to produce composites in a continuous process. The resultant composites were studied by scanning electron microscopy, which showed that the PCL matrix formed continuous and homogeneous films. Dynamic mechanical analyses showed that the rubbery plateau of the virgin matrix was significantly prolonged. Differential scanning calorimetry showed that the crystallisation capacity of the PCL matrix increased with an increase in the reinforcing cellulose. Finally, the produced composites were assessed by performing contact angle measurements of a water droplet, and it was revealed that this parameter increased up to 130°, indicating that their wettability had decreased drastically. © 2012 Elsevier Ltd. All rights reserved.


Lecorre D.,LGP2 Laboratory of Pulp and Paper science | Vahanian E.,LGP2 Laboratory of Pulp and Paper science | Dufresne A.,LGP2 Laboratory of Pulp and Paper science | Bras J.,LGP2 Laboratory of Pulp and Paper science
Biomacromolecules | Year: 2012

Starch nanocrystals (SNCs) are crystalline platelets resulting from the acid hydrolysis of starch. A limiting factor for their more widespread use is their preparation duration. Therefore, this study investigates the possibility of developing an enzymatic pretreatment of starch to reduce the acid hydrolysis duration. A screening of three types of enzymes, namely, α-amylase, β-amylase, and glucoamylase, is proposed, and the latter was selected for a pretreatment. Compared with the regular kinetics of hydrolysis for preparing SNC, that of pretreated starch was much faster. The extent of hydrolysis normally reached in 24 h was obtained after only 6 h, and the regular final yield (15% after 5 days) was reached in 45 h. AFM and X-ray diffraction measurements confirmed that the obtained nanoparticles were indeed SNC. © 2011 American Chemical Society.


Missoum K.,LGP2 Laboratory of Pulp and Paper Science | Bras J.,LGP2 Laboratory of Pulp and Paper Science | Belgacem M.N.,LGP2 Laboratory of Pulp and Paper Science
Biomacromolecules | Year: 2012

The present study reports for the first time a method to obtain water redispersible dried NFC using freeze-drying. No chemical surface modification was required to get this kind of product. Salt addition (sodium chloride: NaCl) strategy has been selected to block and then to regenerate hydrogen bonds during the drying and the redispersion steps, respectively. Several samples were produced at different pH (i.e., 4, 6, 8, and 10). All the redispersed NFC were characterized by different techniques (e.g., FE-SEM, XRD, EPMA-EDX) to check the effect of salt on NFC aggregation. The interactions between NFC and NaCl at different pH conditions have been discussed and the rheology of the redispersed NFC suspension has been performed. All the results prove a perfect water redispersion at pH 8 and exactly similar suspension is obtained after water dispersion of dried NFC following our procedure. These results are very promising for increasing application of NFC. © 2012 American Chemical Society.


Kordoghli B.,University of Monastir | Khiari R.,University of Monastir | Khiari R.,LGP2 Laboratory of Pulp and Paper Science | Dhaouadi H.,University of Monastir | And 3 more authors.
Colloids and Surfaces A: Physicochemical and Engineering Aspects | Year: 2014

This paper reports the functionalisation of a poly(ethylene terephthalate) (PET) surface using an irradiation method under a stream of reactive gas (chlorine). The polyester textile fabric was directly exposed to UVC irradiation (wavelength of approximately 254. nm) under a continuous flow of gaseous chlorine in a solvent-free process. Different amounts of chlorine atoms were fixed to the surface of the fabric based on the experimental conditions. The amount of chlorine on the treated fabric was as much as 4.6% (w/w, oven dried material). First, the modified and virgin fabrics were thoroughly extracted to remove the physically adsorbed molecules. Then, these fabrics were characterised via several techniques including SEM, FTIR-ATR, DSC and XPS. The grafting was confirmed by analysing the fabric surface using MEB (EDS) and XPS (the presence of chlorine atoms). However, the bulk properties remained unchanged. The modified surface was more easily dyed with a cationic dye. © 2013.


PubMed | LGP2 Laboratory of Pulp and Paper Science
Type: Journal Article | Journal: Biomacromolecules | Year: 2012

The present study reports for the first time a method to obtain water redispersible dried NFC using freeze-drying. No chemical surface modification was required to get this kind of product. Salt addition (sodium chloride: NaCl) strategy has been selected to block and then to regenerate hydrogen bonds during the drying and the redispersion steps, respectively. Several samples were produced at different pH (i.e., 4, 6, 8, and 10). All the redispersed NFC were characterized by different techniques (e.g., FE-SEM, XRD, EPMA-EDX) to check the effect of salt on NFC aggregation. The interactions between NFC and NaCl at different pH conditions have been discussed and the rheology of the redispersed NFC suspension has been performed. All the results prove a perfect water redispersion at pH 8 and exactly similar suspension is obtained after water dispersion of dried NFC following our procedure. These results are very promising for increasing application of NFC.

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