Article
Polymer Science
Ahmad Arar, Assi Al Mousawi, Fabrice Morlet-Savary, Jacques Lalevee
Summary: Redox free radical polymerization (RFRP) is a cost-effective technique for producing polymers quickly and without energy consumption. By blending metal salts as oxidizing agents and reducing agents, a process with economic, low toxicity, and high stability is achieved under mild conditions. This method also allows for good control of gel time and an original chemical mechanism for the redox initiators is provided based on electron spin resonance experiments.
Article
Chemistry, Multidisciplinary
Qiang Ma, Michael Schmitt, Yijun Zhang, Gautier Schrodj, Loic Vidal, Elea Collanges, Dominique Begin, Jacques Lalevee
Summary: The study successfully utilized photopolymerization synergistic thermal polymerization process to prepare opaque graphene composites, achieving significant improvement in depth of cure through enhanced dual photo/thermally initiated photopolymerization process, allowing customization of product thickness by adjusting time.
MATERIALS CHEMISTRY FRONTIERS
(2022)
Article
Polymer Science
Ahmad Arar, Lilian Wisson, Jacques Lalevee
Summary: The study introduces a pure organic and peroxide-free redox initiating system for polymerization, which enables full control of work time and high reactivity under mild conditions.
Article
Chemistry, Multidisciplinary
Yuseong Jang, Jinkyu Lee, Jinsung Mok, Junhyeong Park, Seung Yoon Shin, Soo-Yeon Lee
Summary: This study investigates the importance of post-deposition oxidation of the IGZO surface in enhancing interface quality and highlights the benefits of introducing fluorine. It suggests that the presence of fluorine effectively alleviates the chemical reduction reaction, resulting in a defect-passivated and sharp interface.
Article
Polymer Science
Yuhan Zhang, Xiaobing Ju, Yanjing Gao, Fang Sun
Summary: This study reports a photopolymerizable dithioaniline derivative that can reduce volume shrinkage and initiate polymerization under LED irradiation. It effectively initiates polymerization and significantly reduces volume shrinkage without affecting other properties of the system.
EUROPEAN POLYMER JOURNAL
(2022)
Article
Environmental Sciences
Rong Chen, Hui Liu, Peng Zhang, Jie Ma, Menggui Jin
Summary: This study investigated the changes in the abundance of Fe-reducing bacteria and Fe-oxidizing bacteria, as well as the transformation of Fe species, in natural sediment under dynamic redox conditions. The results show that the abundance of Fe-reducing bacteria increased during anoxic stages and decreased during oxic stages, while the abundance of Fe-oxidizing bacteria showed an opposite trend. The transformation of Fe(II)/Fe(III) was not immediately affected by the changes in bacterial abundance, suggesting the presence of residual reactivity of dead bacteria and the bioavailability of Fe species.
SCIENCE OF THE TOTAL ENVIRONMENT
(2022)
Article
Polymer Science
Ling Cai, Bo Liu, Xinli Liu, Dongmei Cui
Summary: In this study, the cationic polymerization of isobutylene was successfully catalyzed in a non-halogenated solvent using a binary initiating system. The molecular weight of the resulting polymer was strongly influenced by the polymerization temperature. The addition of a ternary system significantly improved the catalytic performance.
Article
Polymer Science
Tina Hsia, Jing Wan, Bo Fan, San H. Thang
Summary: The development of a new bifunctional reversible addition-fragmentation chain transfer (RAFT) agent allows for the synthesis of polymers with predetermined molecular weights and low dispersibilities, while also providing functionalities at both polymer termini that allow strong binding to graphene oxide (GO). By controlling the bifunctional RAFT agent, acrylonitrile-styrene-acrylate (ASA) copolymers with different types of acrylates have been synthesized, enabling access to polymers with diverse thermal and mechanical properties. The strong binding between GO and the synthesized polymers has been verified, leading to the preparation of polymer/GO composites with varied tensile strengths and conductivity properties similar to semiconductors.
MACROMOLECULAR RAPID COMMUNICATIONS
(2021)
Article
Polymer Science
Hiroaki Shimomoto, Yuto Miyano, Kaito Kinoshita, Tomomichi Itoh, Eiji Ihara
Summary: A series of Pd complexes with diphosphines or diamines and dichloroquinone-derived units as ligands were synthesized and investigated for their initiation abilities in diazoacetate polymerization. It was found that (diphosphine)Pd(ii)Cl(Cl-quinonyl) complexes produced highly syndiotactic polymers, while (diamine)Pd(0)(dichloroquinone) complexes afforded moderately syndiotactic polymers. These findings demonstrate the potential of these complexes as initiating systems for stereoselective diazoacetate polymerization.
Article
Agricultural Engineering
Nattanon Chinchusak, Aran Incharoensakdi, Saranya Phunpruch
Summary: Research showed that the addition of glucose in the culture medium significantly increased H2 production by Aphanothece halophytica, and the inclusion of reducing agents such as sodium sulfide further enhanced H2 production.
BIOMASS & BIOENERGY
(2022)
Review
Polymer Science
Boyu Zhao, Paul Wilson
Summary: The use of external stimuli to trigger and control polymer synthesis has been a major focus in research for the past 20 years. These stimuli, including heat, light, ultrasound, and electricity, offer non-invasive, atom economic, and precise control over reaction progress. Among them, the use of an electric field in electrosynthesis is considered a green and sustainable solution, offering enhanced efficiency and selectivity in targeted chemical transformations. This review captures the recent advances in electrochemically triggered and controlled polymer synthesis, specifically focusing on chain-growth polymerizations and applications enabled by the use of an electric field.
Article
Chemistry, Multidisciplinary
Ke Yuan, Mark R. Antonio, Eugene S. Ilton, Zhongrui Li, Udo Becker
Summary: Under reducing conditions, U(V) is the dominant species on the magnetite surface, and its existence is limited. By polarizing the magnetite electrode using electrochemical methods, mixed-valence U(V)/U(VI) species can be obtained, which may hinder the presence of tetravalent U.
ACS EARTH AND SPACE CHEMISTRY
(2022)
Review
Chemistry, Multidisciplinary
Bokun Li, Chenyang Hu, Xuan Pang, Xuesi Chen
Summary: This Review provides an overview of a redox-controlled switchable strategy for controlled synthesis of polymers. By developing valence-variable metal-based catalysts, high sequence-control and easy-handling in ring-opening (co)polymerizations can be achieved, resulting in polymer products with desired microstructures and practical performances.
CHEMISTRY-AN ASIAN JOURNAL
(2023)
Article
Engineering, Environmental
Ling Li, Shiyu Liu, Min Cheng, Cui Lai, Guangming Zeng, Lei Qin, Xigui Liu, Bisheng Li, Wei Zhang, Yuan Yi, Mingming Zhang, Yukui Fu, Minfang Li, Mei Long
Summary: In this study, a Fenton-like system was developed using FeMn/biochar composite and reducing agents. Among the tested reducing agents, oxalic acid and hydroxylamine showed significant enhancement in catalytic capacity of the Fenton-like process, leading to improved degradation efficiency of ciprofloxacin. The accelerated metal redox cycle in the FeMn/biochar-H2O2-HA system facilitated the decomposition of H2O2 into reactive oxygen species, which were responsible for the degradation of pollutants.
JOURNAL OF HAZARDOUS MATERIALS
(2021)
Article
Chemistry, Physical
Yan Liu, Yongfeng Zhu, Yongsheng Wang, Bin Mu, Xicun Wang, Aiqin Wang
Summary: By utilizing a convenient redox polymerization method, eco-friendly superabsorbent composites with calcined semicoke were developed, which exhibited excellent water absorption and retention properties. The composites also demonstrated favorable degradability and could release nitrogen during degradation to promote plant growth.
COLLOIDS AND SURFACES A-PHYSICOCHEMICAL AND ENGINEERING ASPECTS
(2022)
