Article
Chemistry, Multidisciplinary
Yuezhou Huang, Chenyang Hu, Xuan Pang, Yanchuan Zhou, Ranlong Duan, Zhiqiang Sun, Xuesi Chen
Summary: This paper presents an electrochemically switchable strategy for copolymerization using heterometallic complexes, allowing control over the composition and properties of multi-block copolymers. The strategy enables the synthesis of polymers with different functionalities.
ANGEWANDTE CHEMIE-INTERNATIONAL EDITION
(2022)
Article
Polymer Science
Huan Gao, Shangtao Chen, Bin Du, Zhenyu Dai, Xu Lu, Kunyu Zhang, Li Pan, Yang Li, Yuesheng Li
Summary: This study focuses on improving the transparency and mechanical properties of high-density polyethylene by preparing multi-block copolymers containing linear polyethylene segments and poly(ethylene-co-norbornene) copolymer segments. Two structurally similar ansa-metallocene catalysts were used to achieve this, resulting in copolymers with enhanced transparency, tensile properties, and processability. Adjustment of the norbornene incorporation and molecular weight of the copolymer can easily control the final performance parameters of the copolymers.
Article
Chemistry, Multidisciplinary
Rami Hador, Michael Shuster, Vincenzo Venditto, Moshe Kol
Summary: This study proposes a new approach to tolerate stereoerrors in the polymer by crowding them in a stereogradient copolymer. A zirconium complex of an amine tris(phenolate) ligand is used as a catalyst for the ring opening polymerization of meso-lactide at room temperature, and stereogradient copolymers are formed in the polymerization of mixtures of meso-lactide/L-lactide at 180 degrees C. These stereogradient copolymers exhibit enhanced crystallinities compared to stereorandom copolymers obtained with tin octanoate.
ANGEWANDTE CHEMIE-INTERNATIONAL EDITION
(2022)
Article
Chemistry, Physical
Ilaria D'Auria, Federica Santulli, Francesca Ciccone, Alessia Giannattasio, Mina Mazzeo, Daniela Pappalardo
Summary: This contribution discusses the catalytic behavior of a phenoxy-imine aluminum catalyst and a bimetallic salen aluminum complex in the ROP of macrolactones and ROCOP of CHO and PA. While a significant difference in activity was observed in the ROP process, similar behaviors were seen in the ROCOP process. Diblock polyesters were synthesized through a one-pot procedure combining two distinct processes.
Article
Polymer Science
Sirawan Kamavichanurat, Kunanon Jampakaew, Pimpa Hormnirun
Summary: The use of biodegradable polyesters is a solution to environmental problems and a step towards a sustainable future. This study presents a series of aluminum complexes that efficiently produce biodegradable polyesters with controlled molar masses. The study also demonstrates the successful preparation of different types of block copolymers using a sequential-feed approach.
Article
Biochemistry & Molecular Biology
Wiriya Thongsomboon, Prasong Srihanam, Yodthong Baimark
Summary: In this study, talcum was used as a nucleating agent to improve the heat resistance of PLLA-PEG-PLLA block copolymer. Thermoplastic starch (TPS) was also used as a low-cost filler to reduce production cost. The resulting PLLA-PEG-PLLA/talcum/TPS composites showed higher crystallinity, flexibility, and heat resistance, as well as good dimensional stability and biodegradability.
INTERNATIONAL JOURNAL OF BIOLOGICAL MACROMOLECULES
(2023)
Article
Chemistry, Inorganic & Nuclear
Maxym Tansky, Robert J. Comito
Summary: Discrete bimetallic catalysts with binucleating ligands were developed for lactone polymerization, showing enhanced reactivity and selectivity. The modular ligand series demonstrated metal-metal cooperativity, leading to improved rate and controlled polymerization. Despite enantioselectivity in the polymerization of l-lactide, the catalysts did not show stereoselectivity in the polymerization of rac- or meso-lactide.
DALTON TRANSACTIONS
(2023)
Article
Polymer Science
Marek Brzezinski, Bartlomiej Kost, Weronika Gonciarz, Agnieszka Krupa, Marta Socka, Maciej Rogala
Summary: The study introduced a smart nanoparticle platform composed of stimuli-responsive copolymers successfully synthesized through ring-opening polymerization and reversible addition-fragmentation chain transfer polymerization, showing excellent pH-sensitive behavior. Additionally, doxorubicin-loaded nanoparticles were effective against cancer cells, however, their cytotoxicity depended on the composition of the nanocarrier.
EUROPEAN POLYMER JOURNAL
(2021)
Article
Biochemistry & Molecular Biology
Federica Santulli, Ilaria Grimaldi, Daniela Pappalardo, Marina Lamberti, Mina Mazzeo
Summary: Chromium and aluminum complexes with salalen ligands were studied as catalysts for the ring-opening copolymerization (ROCOP) of succinic (SA), maleic (MA), and phthalic (PA) anhydrides with various epoxides. Their performance was compared to traditional salen chromium complexes. When used with 4-(dimethylamino)pyridine (DMAP) as the cocatalyst, all catalysts achieved a completely alternating enchainment of monomers to obtain pure polyesters. Switch catalysis allowed the same catalyst to combine the ROCOP of propylene oxide and maleic anhydride with the ring-opening polymerization (ROP) of glycolide (GA) in a one-pot procedure, resulting in a diblock polyester with precise composition.
INTERNATIONAL JOURNAL OF MOLECULAR SCIENCES
(2023)
Article
Materials Science, Characterization & Testing
Yanyan Xu, Qinan Zhang, Zhao Wang, Liqun Zhang
Summary: In this study, a new class of biobased thermoplastic polyester elastomers, poly(butylene terephthalate)-poly(1,4-butylene/2,3-butylene succinate) (PBT-PBBS) copolyesters, were designed and synthesized. These copolyesters exhibited a desired block structure, with a hard phase of crystallized PBT and a soft phase of amorphous PBBS. By adjusting the polycondensation time or the molar ratio of PBT to PBBS, the mechanical properties of these copolyesters, such as tensile strength and elongation at break, could be flexibly tailored. Therefore, they have potential applications in elastomers, hot-melt adhesives, and toughening modifiers.
Article
Polymer Science
Gaia Urciuoli, Odda Ruiz de Ballesteros, Roberta Cipullo, Marco Trifuoggi, Antonella Giarra, Finizia Auriemma
Summary: This study investigates the crystallization behavior of ethylene/1-octene multiblock copolymers. The results show that the crystallization behavior of multiblock copolymers is influenced by both topological confinement and diluent effect, leading to differences in the distribution of methylene sequence lengths.
Article
Chemistry, Inorganic & Nuclear
Tanyawan Pongpanit, Thonthun Saeteaw, Phongnarin Chumsaeng, Pongsakorn Chasing, Khamphee Phomphrai
Summary: Novel homoleptic zinc and magnesium complexes were synthesized using constrained reduced Schiff base ligands derived from substituted 7-hydroxy-1-indanone, which effectively catalyzed the polymerization of lactide with different basicity side arms. The zinc complex with a dimethylamino side arm exhibited high activity, achieving a 92% conversion of L-lactide in 3 minutes at room temperature. Controlled and living behavior of the zinc complex was observed in the rapid synthesis of stereodiblock and triblock copolymers of L-, D-, and rac-lactide with predictable block length and sequence.
INORGANIC CHEMISTRY
(2021)
Article
Polymer Science
An N. Le, Ruiqi Liang, Xiaoyu Ji, Xiaowei Fu, Mingjiang Zhong
Summary: Random copolymerization of norbornene-functionalized macromonomers is a method for synthesizing mixed-graft block copolymers, which can lead to stable phase-separated nanostructures with different side chain compositions. The graft architecture enhances the processability of the material.
JOURNAL OF POLYMER SCIENCE
(2021)
Review
Polymer Science
Marvin Steube, Tobias Johann, Ramona D. Barent, Axel H. E. Mueller, Holger Frey
Summary: Thermoplastic elastomers (TPEs) combine the characteristics of vulcanized rubbers and thermoplastic materials, resulting in soft, flexible, and resilient properties. Various polymerization strategies have been successfully used to synthesize TPE materials on an industrial scale. This review focuses on multiblock structures and gradient copolymers, discussing key parameters of molecular architecture for designing tailored TPE materials.
PROGRESS IN POLYMER SCIENCE
(2022)
Article
Chemistry, Inorganic & Nuclear
Carlos Diaz, Jane Fu, Shazia Soobrattee, Lirong Cao, Kudzanai Nyamayaro, Chatura Goonesinghe, Brian O. Patrick, Parisa Mehrkhodavandi
Summary: In this study, imine- and phosphinimine-supported indium complexes were used as catalysts to control the polymerization and copolymerization of racemic lactide and epsilon-caprolactone by tuning the nature of nitrogen donors and coordinating a hemilabile side group.
INORGANIC CHEMISTRY
(2022)
Article
Chemistry, Physical
Edouard Boivin, Sebastien Saitzek, Francois Fauth, Marielle Huve, Pascal Roussel, Houria Kabbour
Summary: In this study, new potential photocatalysts for overall water splitting (OWS) are obtained through kinetically controlled ion exchange reaction from Na2M2O5F2. These photocatalysts contain lone pair containing oxyfluorides and have a pyrochlore structure. The Sn2+ lone pair stereochemical activity and the narrowing of the band gap contribute to their improved photoconduction response.
CHEMISTRY OF MATERIALS
(2023)
Article
Chemistry, Physical
Aiman Jrondi, Gaetan Buvat, Francisco De La Pena, Maya Marinova, Marielle Huve, Thierry Brousse, Pascal Roussel, Christophe Lethien
Summary: Vanadium nitride films made by magnetron sputtering method show excellent cycling stability, high rate capability, high surface capacitance values, and little aging of the electrodes. Additionally, new findings about the charge storage mechanism in pseudocapacitive VN films are revealed by nanoscale analysis.
ADVANCED ENERGY MATERIALS
(2023)
Article
Chemistry, Multidisciplinary
Rafik Benrabaa, Martine Trentesaux, Pascal Roussel, Annick Rubbens, Rose-Noelle Vannier, Axel Lofberg
Summary: NiAlxFe2_xO4 was synthesized and evaluated in methane reforming without pretreatment. The precursor nature significantly influenced the structural, textural, and reactivity properties. The aluminum compound exhibited high catalytic activity, while NiFe2O4 showed poor activity. Powders prepared with chlorides were more active at low temperatures, but this trend diminished at high temperatures. NiAl2O4 from nitrate precursors showed the best catalytic performance.
JOURNAL OF CO2 UTILIZATION
(2023)
Review
Chemistry, Multidisciplinary
Wajid Ali, Hazrat Ali, Sami Souissi, Philippe Zinck
Summary: More than 390 million tons of fossil fuel plastics have been produced in 2022, causing major health issues and environmental pollution. Bioplastics are considered as a promising alternative due to their carbon neutrality and biodegradability, but technical and cost limitations prevent them from fully substituting fossil fuel plastics.
ENVIRONMENTAL CHEMISTRY LETTERS
(2023)
Article
Electrochemistry
Botayna Bounor, Bouchra Asbani, Camille Douard, Dominique Deresmes, Didier Stievenard, Pascal Roussel, Frederic Favier, Christophe Lethien, Thierry Brousse
Summary: To improve the electrochemical performance of 3D micro-supercapacitors, nanostructured MnO2 films need to be conformally deposited onto the 3D template. The growth mechanism of these films obtained through pulsed electrodeposition was studied using in situ Atomic Force Microscopy and Scanning Electron Microscopy to enhance their electrochemical performance. The impact of ON and OFF times during the deposition process was investigated, providing guidelines for tuning the deposit morphology.
JOURNAL OF THE ELECTROCHEMICAL SOCIETY
(2023)
Article
Chemistry, Multidisciplinary
Ankush Bhatia, Maxime Hallot, Clement Leviel, Pascal Roussel, Jean-Pierre Pereira-Ramos, Christophe Lethien, Rita Baddour-Hadjean
Summary: Investigation of electrochemical lithium (de)intercalation in an atomic layer deposited (ALD) TiO2 anatase thin film on a Si/Al2O3/Pt substrate was performed using Raman spectroscopy. The initial discharge capacity at C/10 rate was 63 mu Ah cm(-2) mu m(-1) (0.5 Li+ mole(-1)), which increased to 77 mu Ah cm(-2) mu m(-1) after further cycles. The ALD thin film exhibited excellent capacity retention over 100 cycles, indicating its good adherence. Raman spectra of LixTiO2 (0 <= x <= 0.5) thin film electrodes suggest the nucleation of the orthorhombic lithiated titanate (LT) Li0.5TiO2 phase at x = 0.1. The LT phase coexisted with tetragonal TiO2 in the composition range of 0.1 <= x <= 0.4, and was pure at x = 0.5. Reversible transformation from orthorhombic LT to tetragonal TiO2 was observed during charging. The high quality of the Raman spectra allowed identification of 12 modes in the 100-800 cm(-1) region for the electrochemically formed LT phase. Raman spectroscopy proved to be a powerful tool for investigating the Li insertion/extraction mechanism in TiO2 thin films.
ADVANCED MATERIALS INTERFACES
(2023)
Review
Chemistry, Multidisciplinary
Khac Huy Dinh, Pascal Roussel, Christophe Lethien
Summary: Microsupercapacitors (MSCs) have not yet reached the industrial level, despite their many advantages, due to the need to optimize electrode material, device configuration, and solid electrolyte in order to improve their performance.
Article
Chemistry, Physical
Yuanyuan Miao, Saifei Yuan, Hao Ren, Ahmed Addad, Alexandre Barras, Pascal Roussel, Mohammed A. Amin, Sabine Szunerits, Rabah Boukherroub
Summary: In this study, an ultrathin hierarchical P-doped MoS2/Ni3S2 heterostructure was synthesized on nickel foam using a one-pot synthesis. The optimized catalyst showed promising activity for hydrogen and oxygen evolution reaction with low overpotentials. Furthermore, the electrode was applied for overall water splitting with low cell voltages and excellent stability. The results highlight the importance of doping and interface engineering in the design of advanced electrocatalytic materials.
ACS APPLIED ENERGY MATERIALS
(2023)
Article
Chemistry, Medicinal
Francesca Ruggieri, Philippe Hance, Bruna Gioia, Alexandre Biela, Pascal Roussel, Jean-Louis Hilbert, Nicolas Willand
Summary: This study describes a novel three-step large-scale extraction and purification method for the simultaneous purification of 11,13-dihydrolactucin (DHLc) and lactucin (Lc) from a chicory genotype rich in these sesquiterpene lactones (STLs) and their glucosyl and oxalyl conjugated forms. The results will facilitate the evaluation of the biological potential of chicory-derived STLs and their semisynthetic analogues.
Article
Chemistry, Physical
Sandy Al Bacha, Sebastien Saitzek, Pascal Roussel, Marielle Huve, Emma E. McCabe, Houria Kabbour
Summary: This study presents the crystal structure, electronic properties, photocatalytic activity, and photocurrent response of a new antimony oxysulfide and its oxyselenide analogue. The results show promising potential for these materials in water splitting using solar energy, due to their low effective masses and strong bonding between lone pair electrons and anions.
CHEMISTRY OF MATERIALS
(2023)
Article
Chemistry, Medicinal
Sylvain Picon, Rajaa Boulahjar, Vanessa Hoguet, Morgane Baron, Isabelle Duplan, Emmanuelle Vallez, Nathalie Hennuyer, Julie Dumont, Veïronique Touche, Emilie Dorchies, Manuel Lasalle, Amandine Descat, Catherine Piveteau, Alexandre Biela, Ludovic Chaput, Bruno O. Villoutreix, Emmanuelle Lipka, Emmanuel Sevin, Maxime Culot, Fabien Gosselet, Sophie Lestavel, Pascal Roussel, Rebecca Deprez-Poulain, Florence Leroux, Bart Staels, Benoit Deprez, Anne Tailleux, Julie Charton
Summary: A series of potent agonists of the bile acid receptor TGR5 were developed through high-throughput screening. By conducting structure-activity relationship (SAR) studies and establishing a three-dimensional quantitative SAR model, a nanomolar TGR5 agonist 77A was identified and a better understanding of the activity profile was obtained.
JOURNAL OF MEDICINAL CHEMISTRY
(2023)
Article
Polymer Science
Catarina Bravo, Nicolas Merle, Mathieu Sauthier, Marc Bria, Julien De Winter, Philippe Zinck
Summary: This work presents a simple and effective method for the polymerization of butadiene using nickel allyl complexes as catalysts, achieving chain transfer and the formation of branched polybutadiene. This method allows for the one-pot synthesis of polymers with specific structures.
Article
Chemistry, Multidisciplinary
Miguel Gallardo, Rodrigo Arancibia, Pascal Roussel, Natacha Henry
Summary: This paper describes a convenient synthesis method for obtaining new ferrocene-based sulfonyl diamine derivatives. The compounds [(?(5)-C5H4SO2NH-CH2-CH2-NH2)Fe(?(5)-C5H5)] (1) and [(?(5)-C5H4SO2NH-C6H4-NH2)Fe(?(5)-C5H5)] (2) were prepared by the reaction between (?(5)- C5H4SO2Cl)Fe(?(5)-C5H5) and the respective diamine precursor: ethylenediamine (1) or p-phenylenediamine (2) with good yields (86% for 1; 70% for 2). Both compounds were characterized by various spectroscopic techniques and cyclic voltammetry, and the molecular structure of 1 was determined by single-crystal X-ray diffraction.
JOURNAL OF THE CHILEAN CHEMICAL SOCIETY
(2023)
Article
Chemistry, Multidisciplinary
Blandine Fontaine, Youssef Benrkia, Jean-Francois Blach, Christian Mathieu, Pascal Roussel, Ahmad I. Ayesh, Adlane Sayede, Sebastien Saitzek
Summary: Two polymorphic phases (alpha- and beta-Cu2V2O7) of copper pyrovanadate were synthesized and the mechanisms of phase transitions were studied using TGA and DSC. High temperature X-ray diffraction revealed negative thermal expansion coefficients of the lattice parameters. The optimal conditions for producing dense thin films were determined using thermogravimetric analysis and differential scanning calorimetry. The thin films exhibited a beta-Cu2V2O7 polycrystalline phase and showed absorption in the visible range, making them suitable for use as photoanodes.
Article
Chemistry, Multidisciplinary
Preeti, Asif Raza, Amit Anand, Natacha Henry, Arun K. Sharma, Pascal Roussel, Vipan Kumar
Summary: The manuscript describes a highly stereo-/regioselective method for synthesizing a diverse array of substituted-3-hydroxy-2-oxindoles. The synthesized compounds showed anti-proliferative activity against various cell lines, and one compound demonstrated exceptional potency. It inhibited cell proliferation by inducing apoptosis, and molecular docking studies revealed its binding capability to the target protein.
