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Séminaire Jeudi 05 septembre 2019 - 10h - Bibliothèque de l’ICMN

Biodegradable polymers and bioresources materials from Elaboration to Applications

LAHCINI, Mohammed
Full Professor, PhD
Faculty of Sciences and Techniques Marrakech, Morocco

Summary :

The presentation deals specifically with two aspects : In the first part, the synthesis and the use of organometallic complexes as highly active initiators for the polycondensation reaction and ring-opening polymerization of cyclic esters for the preparation of biodegradables polymers will be presented. Afterwards, the actives complexes-catalysed in situ polymerization of caprolactone and lactide in the presence of different layered silicates enables the formulation of a series of aliphatic polyesters/silicate bionanocomposites.
The second part of the presentation revolves around the use of renewable biopolymers, illustrated by valorization of chitosan shell-fish waste in the field of materials science and catalysis. The topic deals specifically with two aspects : The association at the nanoscale of chitosan with layered 2-D materials to generate novel structures and the optimization of chitosan’s outer-sphere reactivity to stabilize active nanoparticules. Thereby, firstly the ability of chitosan to form cationic ammonium groups exploited to provide both chitosan-clay and chitosan-graphene oxide, by association of chitosan with clay and graphene oxide, will be presented. Both thin-films and porous microspheres were examined with a special emphasis to their stability under harsh reaction conditions. Subsequently, the amine groups of native chitosan functionalized with small building blocks to generate thiol-terminated and imine-terminated chitosan porous beads will be discussed. The presence of these different ligands allows to tune the palladium coordination around the microspheres during their catalytic activity for cross-coupling catalysis. Immobilization of copper nanoparticles enables access to highly active catalyst for C-S coupling reactions.

Bibliography :

1) Taha El Assimi et al., “Synthesis of poly(ε-caprolactone)-grafted guar gum by surface-initiated ring-opening polymerization” Carbohydrate Polymers 220 (2019) 95–102

2) Laroussi Chaabane et al. Synthesis and characterization of Ni (II), Cu (II), Fe (II) and Fe3O4 nanoparticle complexes with tetraaza macrocyclic Schiff base ligand for antimicrobial activity and cytotoxic activity against cancer and normal cells” Appl Organometal Chem. 2019 ; 4860.(5):1-19

3)Kaoukabi, A., et al.« Efficient Synthesis of New 2H-Chromene Retinoids Hybrid Derivatives by Suzuki Crosscoupling Reactions, Journal of Heterocyclic Chemistry, 2019, 54, 1264

4) Gao, W., Debiemme-Chouvy, C., Lahcini, M., Perrot, H., Sel, O. “Tuning Charge Storage Properties of Supercapacitive Electrodes Evidenced by in Situ Gravimetric and Viscoelastic Explorations” Analytical Chemistry, 2019, 91 (4), 2885

5) Asmaa Bouyahya, et al., “Organotin-bridged ionic liquid as a solvent-free, leaching-resistive catalyst for ring opening polymerization of -caprolactone” New Journal of Chemistry, New J. Chem., 2019,43, 5872

6) Ibtissam Ressam, Mohammed Lahcini, G. A. Luistra, A. El Kadib, Hubert Perrot, Ozlem Sel, Enhanced Proton Transport Properties of Nafion via Functionalized Halloysite Nanotubes, accepted on International Journal of Hydrogen Energy, April 2018 : Manuscript Number : HE-D-18-00210R1

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