Article
Polymer Science
Hamin Kim, Raita Goseki, Chihiro Homma, Takashi Ishizone
Summary: In this study, the anionic polymerization of AB-type difunctional monomers derived from 4-vinyl-1,1-diphenylethylene (VD) was examined using Ph2CHK as the catalyst. The polymerizability of VD was modified by introducing different substituents at the 4'-position of the VD framework. The results showed that the substituents had an influence on the morphology and sequence of the resulting polymer. Through H-1 and C-13 NMR measurements and MALDI-TOF-MS analysis, it was found that ClVD, MeVD, and MeOVD underwent self-alternating polymerization, while Me2NVD formed a homopolymer.
Article
Polymer Science
Marcel Fickenscher, Tom Reimers, Holger Frey
Summary: m-PyPE, a structural analog of DPE, can copolymerize with 2-VP to form copolymers. NMR experiments verified the synthesis and composition of the copolymers.
Article
Multidisciplinary Sciences
Bilal Altundas, Embarek Alwedi, Zhihui Song, Achyut Ranjan Gogoi, Ryan Dykstra, Osvaldo Gutierrez, Fraser F. Fleming
Summary: In this study, the authors report a method for dearomatization of aromatic isocyanides, which leads to the formation of highly functionalized cyclohexadienes with complex structures. The reaction involves the formation of three carbon-carbon bonds, two quaternary stereocenters, and three orthogonal functionalities in a single step. Experimental and computational analyses support a complex cascade mechanism for this reaction. The method offers mild reaction conditions and provides synthetically valuable products.
NATURE COMMUNICATIONS
(2022)
Editorial Material
Chemistry, Multidisciplinary
Vito Capriati
Summary: The study explores polar organometallic chemistry in water and DESs, demonstrating continuous and safe handling of organometallic reagents without clogging problems at room temperature.
Article
Chemistry, Multidisciplinary
Nico Seling, Masakazu Atobe, Kevin Kasten, James D. Firth, Peter B. Karadakov, Frederick W. Goldberg, Peter O'Brien
Summary: This study describes a general and straightforward procedure for the lithiation trapping of cyclic sulfides. By trapping with various electrophiles, over 50 diverse alpha-substituted saturated sulfur heterocycles are successfully synthesized. This method provides access to alpha-substituted cyclic sulfides that are not easily synthesized by currently available methods.
ANGEWANDTE CHEMIE-INTERNATIONAL EDITION
(2023)
Article
Chemistry, Multidisciplinary
Sandip Naskar, Rajib Moi, Indrajit Das, Kumar Biradha
Summary: In this study, the ability of four halogen-substituted acrylic dienone molecules to undergo [2+2] cycloaddition reaction in the solid state under visible light was investigated. It was discovered that one of these materials exhibits reversible oligomerization in a single-crystal-to-single-crystal manner.
ANGEWANDTE CHEMIE-INTERNATIONAL EDITION
(2022)
Article
Chemistry, Multidisciplinary
Quentin Le De, Amal Bouammali, Christian Bijani, Laure Vendier, Iker del Rosal, Dmitry A. Valyaev, Chiara Dinoi, Antoine Simonneau
Summary: By experiment and density functional theory (DFT), it is confirmed that the reported direct nucleophilic attack of the carbanion onto coordinated dinitrogen does not exist. Instead, phenylithium reacts with one of the CO ligands to form an anionic acylcarbonyl dinitrogen metallate that decomposes to give a phenylate complex. The DFT calculations support the experimental results, and the direct attack of a nucleophile on metal-coordinated dinitrogen remains to be demonstrated.
ANGEWANDTE CHEMIE-INTERNATIONAL EDITION
(2023)
Review
Chemistry, Inorganic & Nuclear
Julien Petit, Lionel Magna, Nicolas Mezailles
Summary: This review focuses on the selective transformation of ethylene and alkenes, particularly the involvement of metallacyclopentane in the reaction mechanism, and covers studies on the synthesis of cyclobutane and butadiene derivatives. Studies deciphering the precise mechanism of the transformations through the synthesis of postulated intermediates, labelling experiments, and DFT calculations are also presented.
COORDINATION CHEMISTRY REVIEWS
(2022)
Article
Chemistry, Multidisciplinary
Paco Visser, Ben L. Feringa
Summary: In the past decade, major breakthroughs have been made in C-C bond formation using palladium-catalyzed cross-coupling reactions with organolithium reagents. However, the use of inert conditions and slow addition of organolithium species are usually required. In this study, the Pd-catalyzed cross-coupling of C36H74-gelated organolithium reagents with aryl bromides is described, which proceeds in 5 minutes at room temperature without the need for slow addition or strict inert atmosphere. The use of organolithium gels facilitates handling and greatly enhances process safety, as demonstrated by a gram-scale transformation without the need for extraordinary safety precautions.
CHEMICAL COMMUNICATIONS
(2023)
Article
Chemistry, Organic
Chao Liu, Xiangwen Tan, Jinhui Zhang, Jiahao Wu, Wanqing Wu, Huanfeng Jiang
Summary: This article describes a palladium (II)-catalyzed Nu/Nu'-type 1,1-oxamidation and 1,1-diamination reaction of unactivated alkenyl carbonyl compounds followed by amination. The reaction features a lack of a directing group, good functional group tolerance, and easily operational catalytic reaction conditions. Mechanistic investigations suggest a unique route involving two consecutive nucleopalladations for this 1,1-difunctionalization.
Article
Chemistry, Multidisciplinary
Benjamin Yeh, Saumil Chheda, Steven D. Prinslow, Adam S. Hoffman, Jiyun Hong, Jorge E. Perez-Aguilar, Simon R. Bare, Connie C. Lu, Laura Gagliardi, Aditya Bhan
Summary: A mixed-valence oxotrimer metal-organic framework (MOF), Ni-MIL-127, undergoes thermal treatment to generate a defect that enhances its catalytic activity for propylene oligomerization. The catalyst shows unprecedented stability for this chemistry and a majority of the Ni species in the MOF framework are involved in the catalytic reaction. In situ NO titrations and density functional theory calculations support the plausibility of the defect and mechanism. This study highlights the potential of MOF precatalysts in improving catalytic activity.
JOURNAL OF THE AMERICAN CHEMICAL SOCIETY
(2023)
Article
Chemistry, Multidisciplinary
Benjamin Yeh, Saumil Chheda, Steven D. Prinslow, Adam S. Hoffman, Jiyun Hong, Jorge E. Perez-Aguilar, Simon R. Bare, Connie C. Lu, Laura Gagliardi, Aditya Bhan
Summary: A mixed-valence oxotrimer metal-organic framework (MOF), Ni-MIL-127, with a missing linker defect on the nickel atom catalyzes propylene oligomerization without any cocatalysts or initiators. The catalyst is stable for over 20 hours at 500 kPa and 473 K. The majority of Ni species in the MOF framework catalyze propylene oligomerization, as validated by various analytical techniques.
JOURNAL OF THE AMERICAN CHEMICAL SOCIETY
(2023)
Article
Chemistry, Multidisciplinary
Andryj M. Borys, Eva Hevia
Summary: The Ni-catalysed cross-coupling of aryl ethers involves an anionic pathway, forming electron-rich hetero-bimetallic nickelates. The complexation chemistry between Ni(COD)(2) and PhLi leads to the discovery of a diverse family of catalytically competent lithium nickelates, with dramatic solvent and donor effects playing a crucial role in the catalytic cycle.
ANGEWANDTE CHEMIE-INTERNATIONAL EDITION
(2021)
Article
Polymer Science
Hamin Kim, Raita Goseki, Takashi Ishizone
Summary: In this study, a new AB-type difunctional monomer was used for polymerization to obtain polymers with predicted molecular weights and narrow molecular weight distributions. The carbon-carbon double bonds in the monomer were found to be alternately consumed, leading to the formation of a polymer with unsaturated units in the main chain. This unique reaction mechanism is referred to as self-alternating polymerization.
Article
Chemistry, Organic
Anais Rousseau, Guillaume Vincent, Cyrille Kouklovsky
Summary: A convergent strategy for the synthesis of leustroducsins and phoslactomycins has been designed, and the synthesis and coupling of three main fragments have been accomplished.
BEILSTEIN JOURNAL OF ORGANIC CHEMISTRY
(2022)
Article
Polymer Science
Scott Collins, Mikko Linnolahti, Maricela Garcia Zamora, Harmen S. Zijlstra, Maria T. Rodriguez Hernandez, Odilia Perez-Camacho
Article
Chemistry, Inorganic & Nuclear
Harmen S. Zijlstra, Mikko Linnolahti, Scott Collins, J. Scott McIndoe
Article
Chemistry, Multidisciplinary
Harmen S. Zijlstra, Scott Collins, J. Scott McIndoe
CHEMISTRY-A EUROPEAN JOURNAL
(2018)
Article
Chemistry, Multidisciplinary
Tyler K. Trefz, Matthew A. Henderson, Mikko Linnolahti, Scott Collins, J. Scott McIndoe
CHEMISTRY-A EUROPEAN JOURNAL
(2015)
Review
Chemistry, Inorganic & Nuclear
Scott Collins
COORDINATION CHEMISTRY REVIEWS
(2011)
Article
Chemistry, Physical
Rogelio Charles, Rebeca Gonzalez-Hernandez, Elsa Morales, Javier Revilla, Luis E. Elizalde, Gregorio Cadenas, Odilia Perez-Camacho, Scott Collins
JOURNAL OF MOLECULAR CATALYSIS A-CHEMICAL
(2009)
Article
Polymer Science
Marta Angoy, M. Isabel Bartolome, Eugenio Vispe, Petr Lebeda, M. Victoria Jimenez, Jesus J. Perez-Torrente, Scott Collins, Stepan Podzimek
Review
Chemistry, Inorganic & Nuclear
Stewart P. Lewis, Jianfang Chai, Scott Collins, Timo J. J. Sciarone, Lee D. Henderson, Cheng Fan, Masood Parvez, Warren E. Piers
Article
Chemistry, Inorganic & Nuclear
Tyler K. Trefz, Matthew A. Henderson, Miles Y. Wang, Scott Collins, J. Scott McIndoe
Article
Chemistry, Inorganic & Nuclear
Matthew A. Henderson, Tyler K. Trefz, Scott Collins, Miles Y. Wang, J. Scott McIndoe
Article
Chemistry, Physical
Mikko Linnolahti, Scott Collins
Proceedings Paper
Polymer Science
Benjamin Padilla-Gutierrez, Carolina Ventura-Hunter, Maricela Garcia-Zamora, Scott Collins, Alba N. Estrada-Ramirez, Odilia Perez-Camacho
MACROMOLECULAR SYMPOSIA
(2017)
Article
Engineering, Chemical
Victor E. Comparan-Padilla, Catalina M. Perez-Berumen, Gregorio Cadenas-Pliego, Maria T. Rodriguez-Hernandez, Scott Collins, Odilia Perez-Camacho
CANADIAN JOURNAL OF CHEMICAL ENGINEERING
(2017)
Review
Chemistry, Inorganic & Nuclear
Scott Collins, Tom Ziegler
Article
Polymer Science
Yuanzhang Jiang, Xuyi Wang, Yanting Han, Dakai Gong, Yingchun Gu, Lin Tan
Summary: In this study, FeCl3 and poly(acrylic acid) (PAA) were doped into waterborne polyurethanes (WPUs) to create multifunctional materials with self-healing and antimicrobial properties. WPU/Fe/PAA-5.5, containing 5.5 wt % PAA, exhibited excellent mechanical properties, strong self-healing capabilities, and an impressive antimicrobial rate of over 90%. These supramolecular films were also highly recyclable through hot-pressing.
Article
Polymer Science
Longyu Tian, Min Wang, Guangming Liao, Baoliang Liu, Sujuan Zhang, Yucheng Sun, Zhen Meng, Jintao Zhang, Zaijun Lu
Summary: Two kinds of benzoxazine monomers were synthesized and used to prepare polybenzoxazine anion exchange membranes (AEMs) with quaternary ammonium functionalization. The LQPBZ AEM exhibited better ion conductivity and alkaline stability.
Article
Polymer Science
Claire A. Lemarchand
Summary: This study investigates the shock behavior of three different polymers through molecular dynamics simulations. The results reveal specificities in the shock behavior of polymers, including deviations from the linear relation between shock velocity and particle velocity, as well as differences in shear stress relaxation behind the shock front. It is found that the deviation of the Hugoniot locus is related to the change in the relative contribution of bonding and non-bonding potential energies, while polymers with higher glass transition temperatures exhibit slower shear stress relaxation.
Article
Polymer Science
Zengquan Liu, Xiaochun Yin, He Zhang, Shuo Gao, Qinglin Kuang, Yanhong Feng
Summary: A powder solid-state extension (PSSE) technology was proposed to address the high melt viscosity issue of UHMWPE. By uniaxial extension and sintering in the solid state, a highly self-reinforced material was prepared. X-ray diffraction and scattering techniques were used to study the structural evolution during the PSSE process, and a solid-phase induced transformation model was established.
Article
Polymer Science
Zhike Li, Anyu Luo, Rui Zhou, Xin Li, Haiyan Li
Summary: A novel high temperature resistance IL@SiO2 nanocapsules were successfully prepared and their friction and wear properties in PA6 composites were studied. The addition of IL@SiO2 nanocapsules reduced the friction coefficient and wear rate without affecting the mechanical properties of PA6. The synergy between the IL core and SiO2 wall in the nanocapsules improved the self-lubricating performance of the PA6 composites.
Article
Polymer Science
Xin Liu, Xuhong Guo, Qi Liao
Summary: In this study, an algorithm for accurately estimating viscosity is developed using molecular dynamics simulations and the Green-Kubo formula. This algorithm can be applied to complex systems with long correlations, such as macromolecular and biological simulation systems.
Article
Polymer Science
Hao Pu, Yun-Lei Hou, Jing -Zhou Chen, Dong -Lin Zhao
Summary: The use of modified graphene improves the interfacial adherence of carbon fibers to epoxy resin, resulting in enhanced interfacial and bending properties of CF and matrix in CF/EP composites, as well as increased interlaminar shear strength and flexural strength.
Article
Polymer Science
Wei-Chung Ke, Jin-Wei Lin, Manohar Reddy Busireddy, Yueh-Hsing Lee, Jiun-Tai Chen, Chain-Shu Hsu
Summary: This study introduces a crosslinkable monomer, TAIC, to synthesize three crosslinked polyimide films, which exhibit improved thermal, mechanical, and dielectric properties. The introduction of TAIC enhances the tensile strength, reduces the dielectric constant and dielectric loss, and decreases the coefficient of thermal expansion of the polyimide films.
Article
Polymer Science
Alex Kwasi Kumi, Ruiling Fan, Ye Chen, Yumei Zhang
Summary: The difference in leaching of amylopectin from cellulose/amylopectin/1-butyl-3-methylimidazolium chloride ([Bmim][Cl]) blends during regeneration in water and aqueous ethanol has been studied. Molecular dynamics simulations showed that the dissolution and regeneration mechanisms of amylopectin in [Bmim][Cl] are similar to cellulose in ionic liquids. Water regeneration leads to weak electrostatic interactions, resulting in high leaching of amylopectin. In contrast, ethanol-water interactions enhance electrostatic interactions among amylopectin chains, limiting amylopectin leaching in aqueous ethanol.
Article
Polymer Science
Xi Zeng, Junwei Zhou, Junbiao Peng, Chunsheng Zhang, Danling Wang, Yihu Song, Qiang Zheng
Summary: This study utilizes an oligomer deep eutectic solvent (DES) based on polyethylene glycol to regulate the vulcanization kinetics of rubber. The results show that the DES can accelerate vulcanization at low temperatures without affecting the crosslinking density and Mullins effect.
Article
Polymer Science
Qianqian Yue, Yongfei Peng, Xingjian Liu, Aihua He, Huarong Nie
Summary: The addition of metal deactivators can effectively suppress the aging of TBIR, prolong its lifespan, and have no negative effects on its physical and processing properties. These research findings are of great importance for improving the stability and aging resistance of polymers.
Article
Polymer Science
J. Gomez-Caturla, J. Ivorra-Martinez, R. Tejada-Oliveros, V Moreno, D. Garcia-Garcia, R. Balart
Summary: This work focuses on the development of environmentally friendly PLA formulations by using different esters derived from geraniol as plasticizers. The results show that these esters have good compatibility with PLA, and they can effectively enhance the elongation and plasticity of PLA, reduce its glass transition temperature, and slightly improve its water absorption capabilities.
Article
Polymer Science
Dandan Li, Zhaohui Lu, Zhao Ke, Ke Xu, Fengna Dai, Youhai Yu, Guangtao Qian, Chunhai Chen
Summary: In this study, cross-linked PI aerogel membranes with low dielectric constant and high moisture resistance were prepared by co-polymerization and scraping coating technology. The incorporation of fluorinated blocks and benzimidazole ring structures resulted in novel PI aerogel membranes with fascinating dielectric properties and outstanding moisture resistance.
Article
Polymer Science
Zhaoyang Chu, Qing Zhang, Haihua Luo, Han Zhou, Fapei Zhang, Wei Chen, Wenhua Zhang
Summary: Multi-physical fields solution processing strategy is a universal and facile method for preparing various conjugated polymer films and high-performance devices. In this study, we employed a combined microfluidic flow and ultrasonication strategy (FU) for processing CP solutions, and found a pronounced synergetic effect in promoting the pre-ordering of chains in solution. The conformation order and anisotropy of the solution were revealed through various characterizations. A non-classical nucleation model for polymer crystallization in non-equilibrium solution processing was confirmed. The roles of microfluidic flow and ultrasonication in chain aggregation and crystallization were addressed through multi-physical simulations. Compared to pristine solutions, the FU strategy showed improved solution anisotropy and crystallization kinetics, resulting in higher crystallinity in films and increased mobilities in OFET devices. The FU processing strategy provides a universal approach for regulating chain conformation and aggregation in conjugated polymer solutions.