Article
Chemistry, Multidisciplinary
Maosheng Li, Shuai Zhang, Xiaoyong Zhang, Yanchao Wang, Jinlong Chen, Youhua Tao, Xianhong Wang
Summary: The study describes an effective unimolecular anion-binding organocatalysis for ring-opening polymerization of O-carboxyanhydrides (OCAs), achieving the synthesis of highly isotactic poly(phenyllactic acid) (Ph-PLA) through a dynamic cooperative anion-binding mechanism. This approach addresses the challenge of synthesizing high molecular weight stereoregular polyesters by facilitating efficient chain propagation and maintaining high selectivity for OCA ring-opening over side reactions.
ANGEWANDTE CHEMIE-INTERNATIONAL EDITION
(2021)
Review
Polymer Science
Jianqun Wang, Youhua Tao
Summary: The review highlights the use of various catalysts, especially metal-based catalysts, for controlled ROP of OCAs. It also summarizes recent progress on the organocatalytic ROP of OCAs and discusses the future development of this method for sustainable polyester synthesis.
MACROMOLECULAR RAPID COMMUNICATIONS
(2021)
Article
Chemistry, Multidisciplinary
Yanchao Wang, Maosheng Li, Shixue Wang, Youhua Tao, Xianhong Wang
Summary: SCA monomers derived from amino acids are more reactive than thiolactones for ultrafast and selective ROP, resulting in controlled molecular weight, low dispersities, and retained stereoregularity of the synthesized polythioesters.
ANGEWANDTE CHEMIE-INTERNATIONAL EDITION
(2021)
Article
Polymer Science
Ilya Nifant'ev, Andrey Shlyakhtin, Vladimir Bagrov, Evgeny Shaputkin, Alexander Tavtorkin, Pavel Ivchenko
Summary: The study found that the acyl chlorides derived from NHS and MI can efficiently terminate the living ring-opening polymerization of aliphatic polyesters, producing NHS- and MI-functionalized polymers with high yields. These polymers exhibit high reactivity towards amine- and thiol-containing model substrates in both organic and aqueous media.
Article
Chemistry, Analytical
Jinge Li, Liying Zhao, Wenbin Wang, Yanju Liu, Huaixia Yang, Jinming Kong, Fuchun Si
Summary: A novel sandwich-type electrochemical aptasensor was constructed for CEA detection, showing a wide detection range and low detection limit. PFcGE-CNTs composites prepared by ring-opening polymerization served as a platform, significantly amplifying the electrochemical signal.
SENSORS AND ACTUATORS B-CHEMICAL
(2021)
Article
Polymer Science
Hans R. Kricheldorf, Steffen M. Weidner
Summary: The research showed that 2,2'-dihydroxybiphenyl is the most successful cocatalyst for bismuth subsalicylate in ring-opening polymerization of l-lactide, and optimization of reaction time and temperature is crucial for achieving high weight average molecular weights. Additionally, some unusual transesterification reactions were discovered, and triphenylphosphine was found to be an effective catalyst poison.
JOURNAL OF APPLIED POLYMER SCIENCE
(2021)
Article
Materials Science, Multidisciplinary
Siping Hu, Jianxu Chen, Xun Zhang, Yuying Zhang, Saihu Liao
Summary: Visible light-regulated organocatalytic polymerization has received significant attention in recent years due to its mild, metal-free reaction conditions and the ability to mediate polymerization with spatial and temporal control. In this study, hydroxybenzophenones (BPOHs) were successfully identified as an effective class of photoacid catalysts for the ring-opening polymerization of lactones, resulting in biodegradable polyester products with predictable molecular mass and low dispersity under visible light irradiation.
ACS APPLIED POLYMER MATERIALS
(2022)
Article
Polymer Science
U. L. D. Inush Kalana, Partha P. Datta, Rukshika S. Hewawasam, Elizabeth T. Kiesewetter, Matthew K. Kiesewetter
Summary: This study discusses the H-bond mediated organocatalytic ring-opening polymerizations of four new thionolactone monomers, emphasizing the importance of organocatalysts in synthesizing thionolactone polymers and copolymers, as well as exploring the application of thionoester as a chemical handle in polymer backbone.
Article
Chemistry, Multidisciplinary
Jiandong Li, Fusheng Liu, Yalei Liu, Yong Shen, Zhibo Li
Summary: This study presents a method for chemoselective controlled ring-opening polymerization of bio-renewable bifunctional alpha-methylene-delta-valerolactone (MVL) using strong base/urea binary catalysts. The obtained high molecular weight polyester exhibits good mechanical properties. The pristine monomer can be recovered through thermolysis, establishing a closed-loop life cycle.
ANGEWANDTE CHEMIE-INTERNATIONAL EDITION
(2022)
Article
Polymer Science
Chloe Pascouau, Anne-Laure Wirotius, Henri Cramail, Stephane Carlotti, Frederic Peruch
Summary: The development of sustainable and degradable polymers like aliphatic polyesters has become increasingly important due to growing environmental concerns and depletion of fossil resources. gamma-Lactone-based polyesters have attracted attention for their ability to depolymerize. Functional monomers, such as sugar-based alpha-hydroxy-gamma-butyrolactone (HBL), can be used to tune the properties of these polyesters. In this study, random copolyesters of HBL and e-caprolactone (e-CL) were synthesized via ring-opening copolymerization using La[N(SiMe3)2]3 as a catalyst. High polymerization temperature (80 degrees C) was required for efficient monomer conversion. The characterization and kinetic investigations provided insights into the polymerization mechanism and the formation of different HBL monomer units (cyclic, linear, and branched). The use of La[N(SiMe3)2]3 catalyst achieved high HBL conversion ratio (over 85%) and enabled the synthesis of copolyesters with HBL units ranging from 9 to 63%.
EUROPEAN POLYMER JOURNAL
(2023)
Article
Polymer Science
Huining Ding, Xianmin Wu, Bing Han, Ning Liu, Binyuan Liu, Il Kim
Summary: Highly regioselective ring-opening copolymerizations of 5-norbornene-2,3-dicarboxylic anhydride (NA) and epoxide monomers have been achieved using Cr-III catalysts and specific ligands, allowing for the control of cis/trans regioselectivity in the resulting polyesters by adjusting feed ratio and monomer structure. The resulting polyesters from the copolymerization of NA and epichlorohydrin provide a robust platform for post-modification, with the ring-strained C=C double bonds in the norbornene units facilitating further functionalization through azide-alkene 1,3-dipolar cycloaddition reactions based on desired targets.
Article
Materials Science, Multidisciplinary
Martin Castillo-Santillan, Dina Maniar, Maria C. Gutierrez, Priscila Quinonez-Angulo, Jose Roman Torres-Lubian, Katja Loos, Josue D. Mota-Morales
Summary: Designing biocompatible polymeric biomaterials with programmable life cycles is crucial in reducing the negative environmental impact of plastic waste disposal. In this study, deep eutectic solvent monomers (DESm) consisting of l-lactide and various lactones were formulated to obtain polyesters at low temperatures using organocatalysts and solventless conditions. The expansion of DESm allows for the design of polyesters with tailored molecular weights and crystallinity, contributing to programmable degradability. The ROP of DESm under low temperature and solventless conditions holds promise for the sustainable preparation of biodegradable polymers for biomedical applications.
ACS APPLIED POLYMER MATERIALS
(2023)
Article
Chemistry, Multidisciplinary
Xiao Jiang, Na Zhao, Zhibo Li
Summary: A bifunctional H-bonding catalyst SQ-1 and the binary H-bonding catalytic system consisting of squaramides (SQ-2 to SQ-6) and DBU were discovered to efficiently promote the stereoselective ring-opening polymerization (ROP) of rac-lactide at room temperature. The resulting polylactides exhibited controlled molecular weights and high tacticity.
CHINESE JOURNAL OF CHEMISTRY
(2021)
Article
Chemistry, Multidisciplinary
Qianqian Shi, Yibing Chen, Junjiao Yang, Jing Yang
Summary: This study presents the first report on polyester-based nanocarriers fabricated via ring-opening polymerization-induced self-assembly (ROPISA) of salicylic acid o-carboxyanhydride (SAOCA). The ROPISA process results in well-defined diblock copolymers that exhibit an original cylindrical morphology.
CHEMICAL COMMUNICATIONS
(2021)
Article
Chemistry, Applied
Zhitao Hu, Xiaohui Cao, Huahua Huang, Yongming Chen
Summary: The copolymerization of ε-caprolactone with a hydrophilic macrolactone via organic catalyst mediated ring-opening polymerization can significantly improve the thermal stability, hydrophilicity, and degradability of the copolymers. Increasing the hydrophilic macrolactone content in the copolymer leads to reduced crystallinity and improved hydrophilic properties, resulting in faster degradation rates. This strategy shows promise for modifying polyester materials.
REACTIVE & FUNCTIONAL POLYMERS
(2022)
Article
Engineering, Industrial
Yinan Wang, Kaiwen Wang, Wenjun Cai, Xiaowei Yue
Summary: The proposed physics-informed data-driven surrogate model, named Neural Process Aided Ordinary Differential Equation (NP-ODE), outperforms benchmark methods in both simulation and real FEA data with the smallest predictive error and most reasonable confidence intervals.
Article
Chemistry, Multidisciplinary
Ming Chen, Leng-Leng Shao, Xiao-Qian Wang, Xing Qian, Zhong-Yong Yuan, Lin-Xia Fang, Ai-Xiang Ding, Xian-Wei Lv, Yan-Ning Wang
Summary: Three types of new-structured phosphorized tin-based composites were prepared and demonstrated their potential applications in dye-sensitized solar cells and lithium-ion batteries.
ACS SUSTAINABLE CHEMISTRY & ENGINEERING
(2022)
Article
Materials Science, Multidisciplinary
Jia Chen, Jianwei Xiao, Chang-Yu Hung, Wenbo Wang, Jing Zhao, F. Marc Michel, Chuang Deng, Wenjun Cai
Summary: The effects of alloying concentration on the aqueous corrosion behavior of aluminum-manganese-molybdenum (Al-Mn-Mo) alloys were investigated. The study showed that an increase in Mo concentration improved the corrosion resistance and resulted in the formation of a more compact and less defective passive film.
Article
Materials Science, Multidisciplinary
Zhengyu Zhang, Yi Yao, Liping Liu, Tianyou Mou, Hongliang Xin, Lin Li, Wenjun Cai
Summary: This study investigates the effects of chromium concentration on the mechanical and surface properties of CoCrFeNi alloys using spin-polarized density functional theory calculations. It is found that higher chromium concentration can enhance the Young's modulus, Poisson's ratio, and surface reactivity of the alloys.
JOURNAL OF MATERIALS RESEARCH
(2022)
Article
Chemistry, Multidisciplinary
Xiaoqian Wang, Rong Tong
Summary: This article introduces an atom-economical and scalable method for synthesizing functionalized poly(ester-b-carbonates) with high molecular weights and narrow molecular weight distributions using a single Lewis acidic zinc complex at room temperature. The obtained polymers show better toughness than some commodity polyolefins, and the synthesis method does not require high-pressure CO2 gas and elevated temperatures.
JOURNAL OF THE AMERICAN CHEMICAL SOCIETY
(2022)
Review
Electrochemistry
Ebenezer O. Fanijo, Joseph G. Thomas, Yizheng Zhu, Wenjun Cai, Alexander S. Brand
Summary: This article systematically reviews and discusses the application of advanced surface characterization techniques for surface corrosion monitoring in metals at the micro- and nanoscale. It also presents the in situ, real-time nanoscale topography evolution method that enables measurement of time-dependent local dissolution rate. The study highlights the importance of correlative advanced techniques in identifying nanoscale corrosion mechanisms and improving corrosion predictive models.
JOURNAL OF THE ELECTROCHEMICAL SOCIETY
(2022)
Article
Biochemical Research Methods
Xueqin Wei, Jiecheng Ji, Yongxin Nie, Liangjian Tang, Ming Rao, Xiaoqian Wang, Wanhua Wu, Dan Su, Zhihui Zhong, Cheng Yang
Summary: Photochemical methods are increasingly used in organic synthesis, with supramolecular strategies playing a promising role in controlling stereochemistry in chiral photoreactions.
Cyclodextrin derivatives are widely applied chiral hosts for mediating photoreactions, leading to enhanced enantioselectivity.
The protocol for chiral photoreactions includes preparation of derivatives, host-guest inclusion behavior studies, operation of the photoreaction, and chiral HPLC analyses, resulting in excellent regio- and enantioselectivities.
Article
Nanoscience & Nanotechnology
Hong-Tao Cao, Peng-Fei Hou, Wen-Jing Yu, Ying Gao, Bo Li, Quan-You Feng, He Zhang, Sha-Sha Wang, Zhong-Min Su, Ling -Hai Xie
Summary: By increasing steric hindrance, a high-efficiency exciplex emission system can be obtained. Through introducing a 9-phenylfluorene group into N-ethylcarbazole of the dicyano-substituted 9-phenyl-fluorene, an electron acceptor material with increased steric hindrance is obtained, which helps the exciplex harvest a larger driving force and higher emission efficiencies.
ACS APPLIED MATERIALS & INTERFACES
(2023)
Article
Materials Science, Multidisciplinary
Kaiwen Wang, Zhengyu Zhang, Raja Shekar B. Dandu, Wenjun Cai
Summary: In this study, a crystal-based tribocorrosion modeling framework was developed based on experimental and computational investigations of Al single crystals. The effects of lattice reorientation and dislocations on surface corrosion were taken into account. The experimental results showed that the tribocorrosion rate was independent of the initial crystal orientations. A multiphysics finite element model was developed and successfully predicted the depassivation and repassivation currents during tribocorrosion. The decrease of orientation-dependence during tribocorrosion was explained in terms of the coupling between un-rotated and rotated lattices.
Review
Chemistry, Multidisciplinary
Xiaoqian Wang, Ziyu Huo, Xiaoyu Xie, Narasimhamurthy Shanaiah, Rong Tong
Summary: The demand to replace unsustainable polyolefins drives the transformation of renewable resources into functional and degradable polymers. However, the properties of many degradable homopolymers are inferior to commodity polyolefins, limiting their utility. One-pot synthesis of sequence-defined copolymers from cyclic monomer mixtures is attractive in terms of concept and economics, as it maximizes materials usage and improves polymer performance. Recent advances in one-pot, sequence-controlled polymerizations of cyclic monomer mixtures using a single catalytic system that combines multiple catalytic cycles are highlighted, including the scopes of cyclic monomers, catalysts, and polymerization mechanisms.
CHEMISTRY-AN ASIAN JOURNAL
(2023)
Article
Physics, Applied
Yi Yao, Zhengyu Zhang, Wenjun Cai, Lin Li
Summary: This study investigates the synergic effect of crystallographic orientation and Cr content on the deformation behaviors of single-crystal CrCoFeNi multi-principal element alloy (MPEA) through atomistic simulations. It is found that the activation of multiple slip systems along [100] and [111] orientations leads to the formation of sessile dislocations and a dense dislocation network, while the activation of only two slip systems along the [110] direction results in deformation-induced nanotwins. The influence of Cr concentration and planner defect energies becomes prominent in the latter case. These findings provide a fundamental understanding of the deformation mechanisms in MPEAs, highlighting the synergic effect of crystal orientation and composition on tuning the mechanical behaviors.
JOURNAL OF APPLIED PHYSICS
(2023)
Article
Multidisciplinary Sciences
Xiaoqian Wang, Yang Huang, Xiaoyu Xie, Yan Liu, Ziyu Huo, Maverick Lin, Hongliang Xin, Rong Tong
Summary: The authors develop a machine-learning tool to guide catalyst discovery and reveal mechanistic features affecting stereoselectivity.
NATURE COMMUNICATIONS
(2023)
Article
Engineering, Mechanical
Wenbo Wang, Micheal Kattoura, Stan Bovid, Zhengyu Zhang, David Lahrman, Wenjun Cai
Summary: This study investigated the effects of nanosecond laser shock peening (ns-LSP) parameters on the surface tribocorrosion resistance of WE43 Mg alloys. It was found that the corrosion cathodic reaction rate was decreased and tribocorrosion rate was reduced by 47.8% under lower laser power density and overlapping ratio conditions.
Article
Computer Science, Artificial Intelligence
Feiping Nie, Zhanxuan Hu, Xiaoqian Wang, Xuelong Li, Heng Huang
Summary: Among recently developed algorithms for machine learning and data mining, models using non-convex/non-smooth sparsity-inducing norms achieve promising results on challenging tasks. However, finding effective solutions for these models is still a problem, as existing optimization approaches are often tailored to specific models and may introduce additional parameters without guaranteeing convergence. In this work, a simple yet efficient optimization framework called Iteratively Re-Weighted method (IRW) is proposed to solve these models and provide convergence analysis. The proposed method is validated on two challenging machine learning tasks: multi-task regression and feature selection. Source codes are available at: https://github.com/KDD-Code/Sparse.git.
IEEE TRANSACTIONS ON KNOWLEDGE AND DATA ENGINEERING
(2023)
Article
Chemistry, Physical
Yanqin Rong, Ran Liu, Pengyue Jin, Chunhong Liu, Xiaoqian Wang, Lizhi Fang, Long Chen, Wanhua Wu, Cheng Yang
Summary: A series of cyclodextrin dimers bridged by 1,4,5,8-naphthalenediimide (NDI) were synthesized. Irradiation of these dimers led to a color change, which could be reversed by oxygen. A supramolecular hydrogel was formed by introducing a tetraammonium axle into the polyacrylamide sidechain and mixing with 6-NDI-CD and cucurbit[6]uril. The hydrogel displayed excellent ductility and energy dissipation ability.
JOURNAL OF MATERIALS CHEMISTRY A
(2023)
