2020Article de journal ER2 Auteurs : Duchatel-Crépy, Lucie; Joly, Nicolas; Martin, Patrick; Marin, Adeline; Tahon, Jean-Francois; Lefebvre, Jean-Marc; Gaucher, Valérie Substitution degree and fatty chain length influence on structure and properties of fatty acid cellulose esters Dans: Carbohydrate Polymers, vol. 234, p. 115912, 2020, ISSN: 0144-8617, (ACL). Résumé | Liens @article{DUCHATELCREPY2020115912,
title = {Substitution degree and fatty chain length influence on structure and properties of fatty acid cellulose esters},
author = {Lucie Duchatel-Crépy and Nicolas Joly and Patrick Martin and Adeline Marin and Jean-Francois Tahon and Jean-Marc Lefebvre and Valérie Gaucher},
url = {http://www.sciencedirect.com/science/article/pii/S0144861720300862},
doi = {https://doi.org/10.1016/j.carbpol.2020.115912},
issn = {0144-8617},
year = {2020},
date = {2020-01-01},
journal = {Carbohydrate Polymers},
volume = {234},
pages = {115912},
abstract = {A series of fatty acid cellulose esters (FACEs) with both various degrees of substitution (from DS = 1.7 to 3) and side chain length were obtained by grafting aliphatic acid chlorides (from C10 to C16) onto cellulose backbone, in a homogeneous LiCl/DMAc medium. These materials were characterized by Fourier Transformed InfraRed (FTIR) and Nuclear Magnetic Resonance of Proton (1H NMR) spectroscopies, as well as Wide Angle X-ray Scattering (WAXS), Differential Scanning Calorimetry (DSC), mechanical analyses and chemical resistance to concentrated acid and alkali solutions. Whatever the alkyl chains length and the DS, all samples displayed a layered structure composed of a planar arrangement of parallel cellulosic backbones with fully extended flexible side chains oriented perpendicular to the planar structure without interdigitation. The alkyl chains were able to crystallize as soon as they are long enough. As the DS decreased, the plasticizing effect of the alkyl chains was less pronounced and their ability to crystallize was improved. Regarding the mechanical behavior and the chemical resistance, similar results were observed whatever the DS is.},
note = {ACL},
keywords = {ER2},
pubstate = {published},
tppubtype = {article}
}
A series of fatty acid cellulose esters (FACEs) with both various degrees of substitution (from DS = 1.7 to 3) and side chain length were obtained by grafting aliphatic acid chlorides (from C10 to C16) onto cellulose backbone, in a homogeneous LiCl/DMAc medium. These materials were characterized by Fourier Transformed InfraRed (FTIR) and Nuclear Magnetic Resonance of Proton (1H NMR) spectroscopies, as well as Wide Angle X-ray Scattering (WAXS), Differential Scanning Calorimetry (DSC), mechanical analyses and chemical resistance to concentrated acid and alkali solutions. Whatever the alkyl chains length and the DS, all samples displayed a layered structure composed of a planar arrangement of parallel cellulosic backbones with fully extended flexible side chains oriented perpendicular to the planar structure without interdigitation. The alkyl chains were able to crystallize as soon as they are long enough. As the DS decreased, the plasticizing effect of the alkyl chains was less pronounced and their ability to crystallize was improved. Regarding the mechanical behavior and the chemical resistance, similar results were observed whatever the DS is. |
2019Article de journal ER2 Auteurs : Sango, Thomas; Stoclet, Gregory; Joly, Nicolas; Marin, Adeline; Yona, Arnaud-M Cheumani; Duchatel-Crépy, Lucie; Ndikontar, Maurice Kor; Lefebvre, Jean–Marc Water–soluble extracts from banana pseudo–stem as functional additives for polylactic acid: Thermal and mechanical investigations Dans: European Polymer Journal, vol. 112, p. 466 - 476, 2019, ISSN: 0014-3057, (ACL). Résumé | Liens @article{SANGO2019466,
title = {Water–soluble extracts from banana pseudo–stem as functional additives for polylactic acid: Thermal and mechanical investigations},
author = {Thomas Sango and Gregory Stoclet and Nicolas Joly and Adeline Marin and Arnaud-M Cheumani Yona and Lucie Duchatel-Crépy and Maurice Kor Ndikontar and Jean–Marc Lefebvre},
url = {http://www.sciencedirect.com/science/article/pii/S0014305718318718},
doi = {https://doi.org/10.1016/j.eurpolymj.2019.01.009},
issn = {0014-3057},
year = {2019},
date = {2019-01-01},
journal = {European Polymer Journal},
volume = {112},
pages = {466 - 476},
abstract = {Water–Soluble Extracts (WSE) were obtained from Banana Pseudo–stems (BPS) using a simple and robust deconstruction procedure. WSE were characterized by FTIR, WAXS, TGA–DTG analysis. With the objective of developing fully bio–based polymer formulations, WSE fillers were blended to Poly Lactic Acid (PLA) using a solution blending, casting and thermocompression process. Thermal and mechanical properties were investigated by Differential Scanning Calorimetry (DSC), Dynamic Mechanical Analysis (DMA) and uniaxial tensile tests on neat–PLA (n–PLA) and PLA/WSE blends at various filler contents. Thermal DSC investigations established that WSE act as a plasticizer on PLA. This was further confirmed by DMA by the shift of the loss factor (tan δ) peak maximum towards lower temperatures. WSE also significantly impacted the thermally induced crystallization of PLA and the nucleating power of WSE was assessed by isothermal and non–isothermal studies. WSE had a detrimental effect on PLA brittleness and a slightly positive influence on its stiffness in the glassy state, whereas the drawability remained fairly acceptable when PLA–based materials where drawn at 75 °C above Tg. Moreover, WSE induced an earlier strain–hardening of the composite films as compared to neat PLA. These results underline the valorization potential of such agricultural by–products for sustainable polymer applications in the packaging industry.},
note = {ACL},
keywords = {ER2},
pubstate = {published},
tppubtype = {article}
}
Water–Soluble Extracts (WSE) were obtained from Banana Pseudo–stems (BPS) using a simple and robust deconstruction procedure. WSE were characterized by FTIR, WAXS, TGA–DTG analysis. With the objective of developing fully bio–based polymer formulations, WSE fillers were blended to Poly Lactic Acid (PLA) using a solution blending, casting and thermocompression process. Thermal and mechanical properties were investigated by Differential Scanning Calorimetry (DSC), Dynamic Mechanical Analysis (DMA) and uniaxial tensile tests on neat–PLA (n–PLA) and PLA/WSE blends at various filler contents. Thermal DSC investigations established that WSE act as a plasticizer on PLA. This was further confirmed by DMA by the shift of the loss factor (tan δ) peak maximum towards lower temperatures. WSE also significantly impacted the thermally induced crystallization of PLA and the nucleating power of WSE was assessed by isothermal and non–isothermal studies. WSE had a detrimental effect on PLA brittleness and a slightly positive influence on its stiffness in the glassy state, whereas the drawability remained fairly acceptable when PLA–based materials where drawn at 75 °C above Tg. Moreover, WSE induced an earlier strain–hardening of the composite films as compared to neat PLA. These results underline the valorization potential of such agricultural by–products for sustainable polymer applications in the packaging industry. |
2018Article de journal ER2 Auteurs : Sango, Thomas; Yona, Arnaud-Maxime Cheumani; Duchatel-Crépy, Lucie; Marin, Adeline; Ndikontar, Maurice Kor; Joly, Nicolas; Lefebvre, Jean-Marc Step–wise multi–scale deconstruction of banana pseudo–stem (Musa acuminata) biomass and morpho–mechanical characterization of extracted long fibres for sustainable applications Dans: Industrial Crops and Products, vol. 122, p. 657 - 668, 2018, ISSN: 0926-6690, (ACL). Résumé | Liens @article{SANGO2018657,
title = {Step–wise multi–scale deconstruction of banana pseudo–stem (Musa acuminata) biomass and morpho–mechanical characterization of extracted long fibres for sustainable applications},
author = {Thomas Sango and Arnaud-Maxime Cheumani Yona and Lucie Duchatel-Crépy and Adeline Marin and Maurice Kor Ndikontar and Nicolas Joly and Jean-Marc Lefebvre},
url = {http://www.sciencedirect.com/science/article/pii/S0926669018305594},
doi = {https://doi.org/10.1016/j.indcrop.2018.06.050},
issn = {0926-6690},
year = {2018},
date = {2018-01-01},
journal = {Industrial Crops and Products},
volume = {122},
pages = {657 - 668},
abstract = {Banana Pseudo–stem (BPS) is an annual renewable agricultural by–product with a potential for valorization in the production of paper, textile fibre or new bio–based materials. A gradual deconstruction process was implemented to determine BPS chemical composition and isolate sub–components that may be valorized in the formulation of bio–based polymer composites. At each step, the residues were analyzed by FTIR, X–ray diffraction and TGA–DTG. The chemical composition of the starting material (% of dry weight) was evaluated as: 13.4% total extractives, 6% pectins, 14.7% lignins, 28% hemicelluloses and 38% cellulose. The deconstruction process for BPS was efficient but led to mercerized cellulose (cellulose II) as a final residue, as assessed by the intense X–ray scattering peaks centered at 20.5° and 21.5°. Cellulose II formation was induced by the high concentration of the alkaline KOH solution used to dissolve hemicelluloses in holocellulose. The step–wise removal of non–cellulosic sub–components led to a more thermally stable residue. Long fibres were also obtained from BPS at a yield of 60%. These fibres display cellulose I structure and a thermal stability similar to the extracted cellulose. SEM analyses of long fibres showed transversal and lateral defects, the presence of surface hairiness and an almost cylindrical morphology. Uniaxial tensile tests were carried out at room temperature on 150 specimens randomly chosen among the less hairy fibres, with diameters ranging from 40 to 140 μm. Mechanical investigations (Young modulus: 6.3–26 GPa; nominal stress at break: 140–768 MPa; nominal strain at break: ∼3%) reveal a significant disparity strongly influenced by fibre diameter, except for the nominal strain at break which remains fairly constant around 3%. These results are comparable to the upper range of the values reported for fibres extracted from BPS through alternative chemical routes or for fibres obtained from other annual plants such as jute and hemp.},
note = {ACL},
keywords = {ER2},
pubstate = {published},
tppubtype = {article}
}
Banana Pseudo–stem (BPS) is an annual renewable agricultural by–product with a potential for valorization in the production of paper, textile fibre or new bio–based materials. A gradual deconstruction process was implemented to determine BPS chemical composition and isolate sub–components that may be valorized in the formulation of bio–based polymer composites. At each step, the residues were analyzed by FTIR, X–ray diffraction and TGA–DTG. The chemical composition of the starting material (% of dry weight) was evaluated as: 13.4% total extractives, 6% pectins, 14.7% lignins, 28% hemicelluloses and 38% cellulose. The deconstruction process for BPS was efficient but led to mercerized cellulose (cellulose II) as a final residue, as assessed by the intense X–ray scattering peaks centered at 20.5° and 21.5°. Cellulose II formation was induced by the high concentration of the alkaline KOH solution used to dissolve hemicelluloses in holocellulose. The step–wise removal of non–cellulosic sub–components led to a more thermally stable residue. Long fibres were also obtained from BPS at a yield of 60%. These fibres display cellulose I structure and a thermal stability similar to the extracted cellulose. SEM analyses of long fibres showed transversal and lateral defects, the presence of surface hairiness and an almost cylindrical morphology. Uniaxial tensile tests were carried out at room temperature on 150 specimens randomly chosen among the less hairy fibres, with diameters ranging from 40 to 140 μm. Mechanical investigations (Young modulus: 6.3–26 GPa; nominal stress at break: 140–768 MPa; nominal strain at break: ∼3%) reveal a significant disparity strongly influenced by fibre diameter, except for the nominal strain at break which remains fairly constant around 3%. These results are comparable to the upper range of the values reported for fibres extracted from BPS through alternative chemical routes or for fibres obtained from other annual plants such as jute and hemp. |
2017Article de journal ER2 Auteurs : Vanmarcke, Audrey; Leroy, Lise; Stoclet, Gregory; Duchatel-Crépy, Lucie; Lefebvre, Jean-Marc; Joly, Nicolas; Gaucher, Valérie Influence of fatty chain length and starch composition on structure and properties of fully substituted fatty acid starch esters Dans: Carbohydrate Polymers, vol. 164, p. 249 - 257, 2017, ISSN: 0144-8617, (ACL). Résumé | Liens @article{VANMARCKE2017249,
title = {Influence of fatty chain length and starch composition on structure and properties of fully substituted fatty acid starch esters},
author = {Audrey Vanmarcke and Lise Leroy and Gregory Stoclet and Lucie Duchatel-Crépy and Jean-Marc Lefebvre and Nicolas Joly and Valérie Gaucher},
url = {http://www.sciencedirect.com/science/article/pii/S0144861717301339},
doi = {https://doi.org/10.1016/j.carbpol.2017.02.013},
issn = {0144-8617},
year = {2017},
date = {2017-01-01},
journal = {Carbohydrate Polymers},
volume = {164},
pages = {249 - 257},
abstract = {A series of almost fully substituted Fatty Acid Starch Esters (FASEs) has been obtained in a homogeneous LiCl/DMAc medium by grafting octanoyl (C8), lauroyl (C12) and palmitoyl (C16) chlorides onto 3 starch species: Amylo-Maize, Potato and Waxy Maize. Structure-property relationships of FASEs are investigated as a function of both fatty acid chain length and amylose/amylopectin ratio of the starch. The structural study has revealed a layered type organization in which starch chain planes are separated by fatty chains. The latter are interpenetrated and/or tilted for FASE-C16 whatever the origin of the starch is, and fatty chains partially crystallizes into a structure with hexagonal symmetry. FASEs with C8 and C12 side chains are totally amorphous. The mechanical behavior of FASEs is shown to depend on both side chain length and amylose/amylopectin ratio, and an increase in material ductility is observed at increasing amylose content for C8 and C12 side chains.},
note = {ACL},
keywords = {ER2},
pubstate = {published},
tppubtype = {article}
}
A series of almost fully substituted Fatty Acid Starch Esters (FASEs) has been obtained in a homogeneous LiCl/DMAc medium by grafting octanoyl (C8), lauroyl (C12) and palmitoyl (C16) chlorides onto 3 starch species: Amylo-Maize, Potato and Waxy Maize. Structure-property relationships of FASEs are investigated as a function of both fatty acid chain length and amylose/amylopectin ratio of the starch. The structural study has revealed a layered type organization in which starch chain planes are separated by fatty chains. The latter are interpenetrated and/or tilted for FASE-C16 whatever the origin of the starch is, and fatty chains partially crystallizes into a structure with hexagonal symmetry. FASEs with C8 and C12 side chains are totally amorphous. The mechanical behavior of FASEs is shown to depend on both side chain length and amylose/amylopectin ratio, and an increase in material ductility is observed at increasing amylose content for C8 and C12 side chains. |
2017Article de journal ER2 Auteurs : Pana, Ana-Maria; Popa, Marcel; Silion, Mihaela; Sfirloaga, Paula; Bandur, Geza; Duchatel-Crépy, Lucie Novel semi-interpenetrating network hydrogels based on monosaccharide oligomers with itaconic moiety: synthesis and properties Dans: Iranian Polymer Journal, vol. 26, no. 10, p. 1 - 9, 2017, (ACL). Résumé | Liens @article{PANA20171,
title = {Novel semi-interpenetrating network hydrogels based on monosaccharide oligomers with itaconic moiety: synthesis and properties},
author = {Ana-Maria Pana and Marcel Popa and Mihaela Silion and Paula Sfirloaga and Geza Bandur and Lucie Duchatel-Crépy},
doi = {DOI: 10.1007/s13726-017-0559-4},
year = {2017},
date = {2017-01-01},
journal = {Iranian Polymer Journal},
volume = {26},
number = {10},
pages = {1 - 9},
abstract = {Hydrogel-based drug delivery systems encounter great scientific attention nowadays. Semi-interpenetrating network systems with hydrogel features have been studied as potential drug carriers due to their water intake capacity, biocompatibility and biodegradability. One of the most important features of drug delivery systems is biocompatibility and as such materials derived from natural resources seem to be more appropriate to act as excipients. In this respect, two new semi-interpenetrating networks (semi-IPNs) with hydrogel features based on chitosan, two novel oligomers derived from monosaccharides and 2-hydroxyethylmethacrylate (HEMA) have been synthesized and characterized using FTIR, thermogravimetry, SEM/EDX and swelling behavior. The new sugar-derived oligomers (GI and MI) with double bonds available for further polymerization were obtained by polycondensation of 1,3-propanediol with dicarboxylic acids derived from glucose/mannose skeleton with itaconic anhydride moieties. GI and MI oligomers were characterized by FTIR, NMR spectroscopy and ESI–MS spectrometry, which showed molecular weights of about 7000 Da and linear polymerization chain structure. The new semi-IPNs show good thermal behavior and these hydrogels display a swelling tendency by loading significantly more water in an acid environment than in a neutral solution. Moreover, these superabsorbent hydrogels are able to load significant amount of hydrosoluble active principle (herein the antibiotic levofloxacin) and their releasing profile is marked by an important “burst effect”.},
note = {ACL},
keywords = {ER2},
pubstate = {published},
tppubtype = {article}
}
Hydrogel-based drug delivery systems encounter great scientific attention nowadays. Semi-interpenetrating network systems with hydrogel features have been studied as potential drug carriers due to their water intake capacity, biocompatibility and biodegradability. One of the most important features of drug delivery systems is biocompatibility and as such materials derived from natural resources seem to be more appropriate to act as excipients. In this respect, two new semi-interpenetrating networks (semi-IPNs) with hydrogel features based on chitosan, two novel oligomers derived from monosaccharides and 2-hydroxyethylmethacrylate (HEMA) have been synthesized and characterized using FTIR, thermogravimetry, SEM/EDX and swelling behavior. The new sugar-derived oligomers (GI and MI) with double bonds available for further polymerization were obtained by polycondensation of 1,3-propanediol with dicarboxylic acids derived from glucose/mannose skeleton with itaconic anhydride moieties. GI and MI oligomers were characterized by FTIR, NMR spectroscopy and ESI–MS spectrometry, which showed molecular weights of about 7000 Da and linear polymerization chain structure. The new semi-IPNs show good thermal behavior and these hydrogels display a swelling tendency by loading significantly more water in an acid environment than in a neutral solution. Moreover, these superabsorbent hydrogels are able to load significant amount of hydrosoluble active principle (herein the antibiotic levofloxacin) and their releasing profile is marked by an important “burst effect”. |
2015Article de journal ER2 Auteurs : Pana, Ana-Maria; Popa, Marcel; Furca, Liliana-Marinela; Sfirloaga, Paula; Hadagura, Daniel; Bandur, Geza; Duchatel-Crépy, Lucie; Rusnac, Lucian-Mircea New Semi-Interpenetrating Networks Hydrogels Derived from Monosaccharide Based Oligomers, Chitosan and 2-Hydroxyethyl Methacrylate Dans: Journal of Hydrogels, vol. 8, p. 26 - 33, 2015, (ACL). Résumé | Liens @article{PANA20151,
title = {New Semi-Interpenetrating Networks Hydrogels Derived from Monosaccharide Based Oligomers, Chitosan and 2-Hydroxyethyl Methacrylate},
author = {Ana-Maria Pana and Marcel Popa and Liliana-Marinela Furca and Paula Sfirloaga and Daniel Hadagura and Geza Bandur and Lucie Duchatel-Crépy and Lucian-Mircea Rusnac},
doi = {https://doi.org/10.1166/jh.2015.1007},
year = {2015},
date = {2015-01-01},
journal = {Journal of Hydrogels},
volume = {8},
pages = {26 - 33},
abstract = {n the past few years, the drug delivery systems based on chitosan have drawn tremendous attention, because of their versatility, specificity, non-toxic, accurate and biodegradable nature. The hydrogels synthesized herein combine the properties of a polysaccharide (chitosan) with those of a sugar derived oligomer obtained through chemical modifications performed on pure D-glucose and D-mannose. First, the modification of the sugar raw materials (glucose/mannose) was carried out in order to obtain two oligomers containing a maleic skeleton. These oligomers, G and M were characterized previously. The synthesis of the hydrogels was carried out in aqueous solution, at 60 °C, using a weight ratio G(M):chitosan:HEMA = 1:1:5. The new hydrogels were tested for their thermal stability and their morphology was investigated using SEM/EDX. The hydrogels were also tested for their swelling behavior, and the kinetics of the including/release process was also assessed.},
note = {ACL},
keywords = {ER2},
pubstate = {published},
tppubtype = {article}
}
n the past few years, the drug delivery systems based on chitosan have drawn tremendous attention, because of their versatility, specificity, non-toxic, accurate and biodegradable nature. The hydrogels synthesized herein combine the properties of a polysaccharide (chitosan) with those of a sugar derived oligomer obtained through chemical modifications performed on pure D-glucose and D-mannose. First, the modification of the sugar raw materials (glucose/mannose) was carried out in order to obtain two oligomers containing a maleic skeleton. These oligomers, G and M were characterized previously. The synthesis of the hydrogels was carried out in aqueous solution, at 60 °C, using a weight ratio G(M):chitosan:HEMA = 1:1:5. The new hydrogels were tested for their thermal stability and their morphology was investigated using SEM/EDX. The hydrogels were also tested for their swelling behavior, and the kinetics of the including/release process was also assessed. |
2012Article de journal ER2 Auteurs : Duchatel-Crépy, Lucie; Monchau, Francine; Chai, Feng; é, Gw; Hivart, Philippe; Hildebrand, Hartmut F; Martin, Patrick; Joly, Nicolas Evaluation of a bio-based hydrophobic cellulose laurate film as biomaterial-Study on biodegradation and cytocompatibility Dans: Journal of Biomedical Materials Research Part B: Applied Biomaterials, vol. 100B, no. 4, p. 1000–1008, 2012. Liens @article{Crepy2012,
title = {Evaluation of a bio-based hydrophobic cellulose laurate film as biomaterial-Study on biodegradation and cytocompatibility},
author = {Lucie Duchatel-Crépy and Francine Monchau and Feng Chai and Gw é and Philippe Hivart and Hartmut F Hildebrand and Patrick Martin and Nicolas Joly},
doi = {10.1002/jbm.b.32665},
year = {2012},
date = {2012-02-01},
journal = {Journal of Biomedical Materials Research Part B: Applied Biomaterials},
volume = {100B},
number = {4},
pages = {1000--1008},
publisher = {Wiley},
keywords = {ER2},
pubstate = {published},
tppubtype = {article}
}
|
