Article
Biochemistry & Molecular Biology
Maxim V. V. Zabalov, Badma N. N. Mankaev, Mikhail P. P. Egorov, Sergey S. S. Karlov
Summary: Density functional theory simulations were conducted to investigate the ring-opening copolymerization of epsilon-caprolactone and L-lactide using a novel gallium complex with an aminobis(phenolate) ligand. The results show that the copolymerization with this catalyst exhibits a faster polymerization rate for epsilon-caprolactone than for L-lactide, suggesting the formation of a predominantly block copolymer composed of epsilon-caprolactone and L-lactide.
INTERNATIONAL JOURNAL OF MOLECULAR SCIENCES
(2022)
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
Martin Castillo-Santillan, Jose Roman Torres-Lubian, Antonio Martinez-Richa, Silvia T. Huerta-Marcial, Maria C. Gutierrez, Katja Loos, Maria Guadalupe Perez-Garcia, Josue D. Mota-Morales
Summary: This work provides new insights into the ring-opening polymerization of L-lactide and e-caprolactone, leading to the synthesis of polymer blends and a block copolymer. The selection of parameters and catalysts allows for the production of polyesters with tunable properties and controlled degradation profiles.
Article
Chemistry, Multidisciplinary
Begum Canan Yildiz, Asgar Kayan
Summary: Titanium (IV) silyliminophenolate complexes were synthesized and shown to be active catalysts for the ring-opening polymerization of epsilon-caprolactone and L-lactide. The structures of compounds were elucidated using spectroscopic and thermal analysis methods, and resulting polymers were characterized using gel permeation chromatography.
SUSTAINABLE CHEMISTRY AND PHARMACY
(2021)
Article
Polymer Science
Monique J. Leite, Tamara Agner, Fabricio Machado, Brenno A. D. Neto, Pedro H. H. Araujo, Claudia Sayer
Summary: This study utilized an iron-containing imidazolium-based ionic liquid as a catalyst to efficiently catalyze the ring-opening polymerization of epsilon-caprolactone under mild reaction conditions, resulting in the synthesis of polycaprolactones with high yields and narrow molecular weight distributions.
JOURNAL OF POLYMER RESEARCH
(2022)
Article
Chemistry, Multidisciplinary
Hai-Bo Wu, Xian-Tai Zhou, Xiao-Wu Zhou, Yan-Xiong Fang
Summary: A feasible industrial method for poly(e-caprolactone) (PCL) preparation using benzoic acid as organocatalyst was developed. Benzoic acid was proved to efficiently catalyze the ring-opening polymerization of e-caprolactone (e-CL) under mild conditions. The conversion of e-CL to PCL reached 84.7% under optimized reaction conditions, with a number-average molecular weight (Mn) of 7700 g/mol and dispersity (PDI) of 1.25. Additionally, a monomer-activated ring-opening polymerization mechanism mediated by benzoic acid was proposed.
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
Polymer Science
Felipe De La Cruz-Martinez, Marc Martinez de Sarasa Buchaca, Almudena Del Campo-Balguerias, Juan Fernandez-Baeza, Luis F. Sanchez-Barba, Andres Garces, Carlos Alonso-Moreno, Jose A. Castro-Osma, Agustin Lara-Sanchez
Summary: Bimetallic heteroscorpionate acetate zinc complexes exhibited high catalytic activity and selectivity in ring-opening copolymerization reactions, particularly in copolymerization of cyclohexene oxide and cyclic anhydrides.
Article
Polymer Science
Ryoya Kamiki, Tomohiro Kubo, Kotaro Satoh
Summary: This study aims to synthesize novel degradable polymers by copolymerizing bio-based thiocarbonyl compounds with various vinyl monomers using radical addition-fragmentation ring-opening reaction. The obtained polymers have degradable functional groups that can be cleaved under specific conditions with different chemical stimuli.
MACROMOLECULAR RAPID COMMUNICATIONS
(2023)
Review
Chemistry, Inorganic & Nuclear
Ling-Jo Wu, Wei Lee, Prasanna Kumar Ganta, Yu-Lun Chang, Yung -Chi Chang, Hsuan-Ying Chen
Summary: Multinuclear metal complexes can enhance the catalytic activity of ROP catalysts, but the distance between catalytic metal centers and the resonance of ligands play important roles in the catalytic reaction. This review focuses on recent studies of multinuclear metal catalysts in ROP and compares their catalytic activity with mononuclear metal catalysts.
COORDINATION CHEMISTRY REVIEWS
(2023)
Article
Polymer Science
Yi Wan, Yun Bai, Hai Xu, Jianghua He, Yuetao Zhang
Summary: The study successfully synthesized five chiral binuclear aluminum methyl complexes, which catalyze the ring-opening polymerization of rac-lactide in a controlled manner and produce polymers with high isoselectivity. The kinetic studies show a first-order dependence on monomer concentration, supporting an enantiomorphic site control mechanism for the catalysts. This strategy can also be applied to other lactones for ring-opening polymerization.
MACROMOLECULAR RAPID COMMUNICATIONS
(2021)
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
Biochemistry & Molecular Biology
Ahmed Abd El-Fattah, Elizabeth Grillo Fernandes, Federica Chiellini, Emo Chiellini
Summary: Amphiphilic copolymers with interesting architecture and tunable properties are promising materials for biomedical applications. Enzymatic catalysis provides a suitable alternative for the preparation of these materials without the use of toxic catalysts. The structure-property relationship of copolymers was studied by varying the molecular weight of Pluronic (EPE) and the molar ratios between ε-caprolactone monomer and EPE macro-initiator (M/In). The obtained copolymers were chemically characterized and their morphologies evaluated. The results showed a correlation between the differential scanning calorimetry data and X-ray diffraction data, suggesting the importance of the central block length in crystal formation. Preliminary cytotoxicity experiments confirmed the non-toxic nature of the copolymers.
INTERNATIONAL JOURNAL OF MOLECULAR SCIENCES
(2022)
Article
Polymer Science
Yutthana Wongnongwa, Setsiri Haesuwannakij, Kwanchanok Udomsasporn, Phongnarin Chumsaeng, Anucha Watcharapasorn, Khamphee Phomphrai, Siriporn Jungsuttiwong
Summary: Polymerization of biodegradable lactide and lactone has been extensively investigated. Density functional theory calculations were used to study the initiation and first propagation for ring-opening polymerization mechanisms of L-lactide (LA) and e-caprolactone (CL) on aluminum complexes. The results showed that the ROP mechanisms of LA and CL on different catalysts were classified into homopolymerization and copolymerization. The understanding gained in this study could contribute to the development of high-performance catalysts for biodegradable lactide and lactone ROP reactions.
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)
