Article
Chemistry, Applied
Tong Lei, Zhanshan Ma, Hongju Liu, Xiaoyue Wang, Pei Li, Feifei Wang, Weitai Wu, Shaojie Zhang, Guoyong Xu, Fuzhou Wang
Summary: A series of alpha-diimine nickel(II) catalysts with different para-substituents were synthesized and characterized. The introduction of para-substituents efficiently modulated the chain-walking process in the catalyst system, leading to improved thermal stability and catalytic performance.
APPLIED ORGANOMETALLIC CHEMISTRY
(2022)
Article
Chemistry, Multidisciplinary
Jingshuang Yang, Xiaoqiang Hu, Zhongbao Jian
Summary: This study prepared photoresponsive catalysts by introducing azobenzene moieties into Ni(II) complexes, and modulated ethylene polymerization and copolymerization reactions through the trans-cis isomerization of azobenzene-functionalized Ni(II) catalysts, resulting in changes in the properties of the polymers.
CHINESE JOURNAL OF CHEMISTRY
(2022)
Article
Chemistry, Applied
Jie Wu, Pei Li, Juan Zhang, Zhengquan Dong, Wu Li, Muhammad Sohail Bashir, Yougui Li, Fuzhou Wang
Summary: A class of nickel (II) complexes with variable electronic nature were synthesized and characterized. X-ray crystallography analysis showed that these complexes have a distorted tetrahedral geometry and can be used for chain-walking polymerization to obtain highly active and high molecular weight branched polymers.
APPLIED ORGANOMETALLIC CHEMISTRY
(2023)
Article
Polymer Science
Oldrich Kotyza, Olga Kockova, Jan Merna
Summary: This article describes a method for chain-end functionalization of branched polyolefins obtained by living olefin polymerization initiated by alpha-diimine nickel catalysts. The method involves the transmetalation of living polymer chains from nickel growing centers to excess organozinc, organomagnesium, or organoaluminum transfer agents, followed by oxidation. Hydroxy-terminated polyolefins were obtained with efficiencies ranging from 25% to 99%.
Article
Chemistry, Applied
Jia-Jun Wu, Bo Deng, Jia-Hong Hou, Xin-Yue Huang, Hui-Yi Tang, Kai-Ti Wang
Summary: Four asymmetric a-diimine dibromide nickel(II) complexes were synthesized and characterized. These complexes showed high activities toward norbornene (NBE) homopolymerization and efficiently promoted the copolymerization of NBE with n-butyl methacrylate (n-BMA) and di(n-butyl) itaconate (n-DBI), resulting in high molecular weight polymers and copolymers with improved solubilities and thermal stability.
APPLIED ORGANOMETALLIC CHEMISTRY
(2022)
Review
Chemistry, Multidisciplinary
Maximilian J. Werny, Florian Meirer, Bert M. Weckhuysen
Summary: This review discusses the application of 2D and 3D chemical imaging techniques in the study of olefin polymerization and polyolefin decomposition catalysts. Laboratory and synchrotron-based chemical imaging techniques provide high spatial and temporal resolutions, expanding the analytical tools available in the field of heterogeneous catalysis and polymer science. Future research directions include in situ and operando (spectro-)microscopy experiments, as well as obtaining real-time information on the formation, decomposition, and mobility of polymer phases within single catalyst particles.
ANGEWANDTE CHEMIE-INTERNATIONAL EDITION
(2023)
Article
Chemistry, Applied
Daohong Liao, Shabnam Behzadi, Changwen Hong, Chen Zou, Muhammad Qasim, Min Chen
Summary: Modifying the steric structure of ligands has become a prevalent strategy to enhance the properties of alpha-diimine-type nickel catalysts. In this study, nickel complexes with specific backbone structures were synthesized and characterized, showing significantly improved catalytic activity, thermal stability, and properties of polymer products. It is believed that this backbone strategy can be applied in future studies of other catalytic reactions.
APPLIED ORGANOMETALLIC CHEMISTRY
(2021)
Article
Chemistry, Physical
Yixin Zhang, Yuxing Zhang, Xiaoqiang Hu, Chaoqun Wang, Zhongbao Jian
Summary: This article discusses key advances in controlling chain walking and suppressing chain transfer reactions in late-transition-metal-mediated olefin polymerization to achieve precise control over polymer architectures.
Article
Chemistry, Physical
Yixin Zhang, Yuxing Zhang, Xiaoqiang Hu, Chaoqun Wang, Zhongbao Jian
Summary: This article highlights the key advances in controlling chain walking and suppressing chain transfer reactions in late-transition-metal-mediated olefin polymerization to achieve precise synthesis of polyolefin materials.
Article
Chemistry, Physical
Lihua Guo, Weiqiang Chen, Wanjuan Wang, Wenyu An, Shengnan Gao, Yang Zhao, Mingling Luo, Guoshan He, Tongtong Liu
Summary: The tuning of polyolefin microstructure through ligand modification in transition metal-based catalysts has attracted significant interest. This study synthesized and characterized a series of a-diimine Ni(II) catalysts with varied steric substituents and investigated their catalytic behavior in 1-octene and 1-decene polymerization. The effect of ortho-substituents on the insertion fashion and chain-walking was established, and the branching distribution analysis revealed significant differences between catalysts with different substituents. Additionally, the mechanical properties of the obtained polymers were compared.
JOURNAL OF CATALYSIS
(2022)
Article
Chemistry, Physical
Minghang Ji, Guifu Si, Yao Pan, Chen Tan, Min Chen
Summary: In this study, a series of α-diimine palladium complexes with two vinyl units were designed and synthesized, and they were employed as chain-transfer agents in tandem ring opening metathesis polymerization/cross metathesis reactions. Well-defined polymeric Pd catalysts with improved catalytic performances were successfully prepared. These catalysts exhibited enhanced catalytic activities in ethylene and 1-hexene polymerization, as well as improved tolerance to polar comonomers. The catalyst performance could be tuned by varying the structure or amount of cyclic monomer used in their preparation.
JOURNAL OF CATALYSIS
(2022)
Article
Chemistry, Inorganic & Nuclear
Zhou Lu, You Ge, Shengyu Dai
Summary: In this study, two a-diimine ligands and their corresponding nickel and palladium complexes were synthesized and used to explore the effect of axial flexible shielding on ethylene (co)polymerization. The nickel complexes showed high activity and produced lightly branched polyethylenes with high molecular weights, while the palladium complexes exhibited moderate activity and produced highly branched polyethylenes. Moreover, the size of the cycloalkyl ring in the a-diimine catalysts strongly influenced the ethylene (co)polymerization.
INORGANIC CHEMISTRY
(2023)
Article
Chemistry, Multidisciplinary
Wang Zihao, Chen Min, Chen Changle
Summary: Since the discovery of Ziegler-Natta catalyst, significant progress has been made in catalyst design for olefin polymerization. However, the development of catalysts remains a fresh source of innovation in this field. Nickel-based catalysts show great promise in olefin polymerization due to their low cost and abundance. In this study, three unsymmetrical a-diimine nickel catalysts with different steric effects were designed and their catalytic performances in ethylene polymerization were investigated.
ACTA CHIMICA SINICA
(2023)
Article
Polymer Science
Handou Zheng, Yinwu Li, Wenbo Du, Chi Shing Cheung, Donghui Li, Heng Gao, Huiyun Deng, Haiyang Gao
Summary: In this study, open box-like α-diimine dibromonickel complexes were synthesized and their role in ethylene polymerization was investigated. The complexes showed enhanced activity and thermal stability, and produced lightly branched polyethylenes.
Article
Polymer Science
Yuxing Zhang, Zhongbao Jian
Summary: A polar additive strategy using nitrile compounds has been developed to facilitate the copolymerization of ethylene with various polar monomers, mediated by a single alpha-diimine palladium(ii) catalyst. The catalytic activities, copolymer molecular weights, branching densities and microstructures, and co-monomer incorporations can be modulated by varying the amount of the polar additive. Possible mechanistic insights were proposed based on the copolymerization results.
Article
Polymer Science
Mustafa Kalay, Abidin Esidir, Mahmut Ruzi, N. Burak Kiremitler, Mustafa Serdar Onses
Summary: This study proposes stable and addressable polymer PUFs, utilizing a cross-linkable polymer system, which demonstrates high stochastic characteristics and low-cost production. The performance of the polymer features is evaluated through various analyses, and direct image authentication is achieved using feature matching algorithms.
EUROPEAN POLYMER JOURNAL
(2024)
Article
Polymer Science
Jingyu Jin, Guoqiang Lu, Jun Nie, Xiaoqun Zhu
Summary: Photopolymerization technology is limited in the fields of food packaging and biomedicine due to the high migration of small molecules from photoinitiators. In this study, a polymerizable 2-vinyl thioxanthone (ETX) was synthesized to improve the migration stability of photoinitiators. Macromolecular photoinitiators (PPI1, PPI2) were also prepared to further reduce migration. The results showed that the ETX/TEOA system had higher initiation performance and PPI2 displayed favorable initiation ability. Additionally, the migration of ETX, PPI1, and PPI2 in photocured film was significantly reduced. These low-migration photoinitiators have potential applications in the fields of food packaging and biological materials.
EUROPEAN POLYMER JOURNAL
(2024)
Article
Polymer Science
Weijie Li, Jun Nie, Yingying Zhao, Xiaoqun Zhu
Summary: This study focuses on the development of high-performance, low-migration photoinitiators. A polymerizable photoinitiator (VBP) was synthesized by introducing an ethylene group into benzophenone, and three different molecular weight single-component photoinitiators (PVBN1-3) were synthesized based on VBP. The results show that these new photoinitiators have stronger absorption ability compared to benzophenone and significantly reduce the migration of initiators and co-initiators, addressing the safety concerns caused by migration.
EUROPEAN POLYMER JOURNAL
(2024)
Article
Polymer Science
Seira Morimune-Moriya, Yuki Iwahashi, Mitsuru Nakamura, Daisuke Ogawa, Keiji Nakamura
Summary: This study investigates the effect of plasma treatment on carbon nanotubes (CNTs) and the structure/properties of polyimide (PI) nanocomposites with ultra-low content of CNTs. The results show that plasma treatment introduces isocyanate groups on the surface of CNTs and enhances the interfacial interaction between PI and treated CNTs. This leads to a significant improvement in the mechanical properties of the nanocomposites, with even a small addition of treated CNTs showing a substantial increase in Young's modulus, tensile strength and toughness.
EUROPEAN POLYMER JOURNAL
(2024)
Article
Polymer Science
Yuanlong Li, Chaojie Chen, Guoqing Cui, Li Liu, Chao Zhou, Guangfeng Wu
Summary: In this study, a novel ion-conducting hydrogel was fabricated using a straightforward approach. The hydrogel showed excellent tensile properties and high toughness due to physical interactions and covalent binding. Additionally, the introduction of hydroxyethyl cellulose and lithium chloride improved the biocompatibility, mechanical properties, electrical conductivity, and frost resistance of the hydrogel, demonstrating its potential for cold climate applications.
EUROPEAN POLYMER JOURNAL
(2024)
Article
Polymer Science
Dengwei Yan, Jinxian Yang, Xuejun Pan, Xiaozheng Duan, Lianwei Li, Mo Zhu
Summary: The influence of backbone length on grafting efficiency during the graft-onto reaction process was investigated. It was found that the polydispersity effect of backbone length does not affect the final grafting efficiency, indicating that the local dynamics of chain segments dominate the graft-onto process.
EUROPEAN POLYMER JOURNAL
(2024)
Article
Polymer Science
Zhaoyi Luo, Xianjie Pan, Fanqi Liu, Quanxi Yi, Yanning Zeng, Yunhua Chen, Chaoyang Wang
Summary: This study provides a method to prepare high-performance epoxy materials with good malleability and thermal stability. The materials have self-healing and welding capabilities, thanks to the addition of specific chemical bonds and network structures. They exhibit mechanical properties comparable to commercial epoxy resins and show great potential for sustainable industrial development.
EUROPEAN POLYMER JOURNAL
(2024)
Article
Polymer Science
Chaoji Xiong, Hao Wang, Lihua Deng, Kun Liang, Chunhua Wu, Wei Wu, Qian Chen
Summary: In this study, four polyamides were synthesized and their adsorption performances for Hg2+ in aqueous systems were investigated. The polyamides exhibited high adsorption capacities and excellent reusability, with the involvement of sulfur, nitrogen, and oxygen in the chemical adsorption process of Hg2+.
EUROPEAN POLYMER JOURNAL
(2024)
Article
Polymer Science
Siim Laanesoo, Olivier Bonjour, Rauno Sedrik, Iris Tamsalu, Patric Jannasch, Lauri Vares
Summary: The insertion of rigid aliphatic or aromatic building blocks in polymer structures is an effective way to synthesize high -Tg polymer materials. In this study, a series of isosorbide-2-aryl carboxylate-5-methacrylate monomers (ArIMAs) were synthesized by functionalizing isosorbide 5-methacrylate with various aromatic lignin-inspired esters. These monomers were polymerized to obtain high molecular-weight poly(aryl carboxylate isosorbide methacrylates) (PArIMAs). The resulting polymers showed high glass transition temperatures and thermal stability, making them suitable for use as high-performance plastics and coatings.
EUROPEAN POLYMER JOURNAL
(2024)
Article
Polymer Science
Yuqian Wu, Weijie Xu, Jianliang Li, Zhangfeng Zhong, Liqing Huang, Shengke Li, Huaping Tan
Summary: This study investigates the improvement of degradation and drug release characteristics of dynamic Schiff base-mediated natural polysaccharide hydrogels using tannic acid (TA), leading to enhanced stability and functionality.
EUROPEAN POLYMER JOURNAL
(2024)
Article
Polymer Science
Xi Zhang, Xiangli Kong, Xin Zhou, Yiyan Gao, Yibo Sun, Guanghui Gao, Wei Liu, Kai Shi
Summary: Conductive hydrogels have great development prospects in flexible strain sensors, but long-term direct contact with human skin can cause bacterial infection. A hydrogel with antibacterial, biocompatibility, and toughness was designed and manufactured using a freeze-thaw method. The hydrogel maintains tensile properties and fatigue resistance at low temperatures and is resistant to bacteria. Therefore, hydrogel sensors can be used to monitor human movements.
EUROPEAN POLYMER JOURNAL
(2024)
Article
Polymer Science
Wei Zhang, Jiangang Yu, Mingyang Wu, Rui Li, Anqiang Zhang, Yaling Lin
Summary: In this study, polyacrylamide containing quaternary ammonium salts (PAM-X) were synthesized and found to effectively inhibit soil-borne pathogenic fungi while maintaining the balance of microbial population in soil. PAM-X also showed low toxicity to earthworms and fish, providing a new method for the prevention and control of soil-borne fungal diseases.
EUROPEAN POLYMER JOURNAL
(2024)
Article
Polymer Science
Jiawen He, Haojie Yu, Li Wang, Jian Yang, Yanhui Zhang, Wenbing Huang, Chenguang Ouyang
Summary: This review discusses the use of polymeric hydrogels for atmospheric water harvesting (AWH), including the mechanism of water sorption, fabrication methods, and strategies for optimizing the structure of hydrogels. The extended applications of hygroscopic photothermal hydrogels, such as agricultural irrigation and dehumidification, are also explored. The challenges and prospects of using polymeric hydrogels for AWH are summarized.
EUROPEAN POLYMER JOURNAL
(2024)
Article
Polymer Science
Ying Du, Shuaishuai Lu, Yuanna Sun, Qingshan Li, Xinhai He
Summary: This study introduces a method to improve the performance of hydrogels by incorporating proline, resulting in hydrogels with excellent stretchability, high conductivity, and long-term stability. The hydrogel remains flexible and conductive even at ultra-low temperatures.
EUROPEAN POLYMER JOURNAL
(2024)