Article
Polymer Science
Mingtao Zhou, Shengfei Wang, Aishun Ding, Guolin Lu, Xiaoyu Huang, Xue Jiang, Binbin Xu
Summary: This study presents the controlled synthesis of polyallene-based diblock copolymers with tunable structure and low polydispersities via reversible addition-fragmentation chain transfer (RAFT) polymerization, highlighting the in situ formation of unique nanofibers based on PNIPAM-b-PPOA diblock copolymer through polymerization-induced self-assembly (PISA). The work opens a new avenue for synthesizing well-defined polyallene-based copolymers and nanoparticles for broad applications using living/controlled radical polymerization.
Article
Chemistry, Multidisciplinary
Ken-ichi Yamashita, Shouichi Takeuchi, Ken-ichi Sugiura
Summary: In this study, meso-aminodiarylporphyrin was oxidatively oligomerized to yield stable oligomers with properties similar to fully oxidized polyanilines. The oligomers consisted of electron-rich porphyrinoid and electron-deficient quinoid moieties, exhibiting a broad electronic absorption band in the near infrared region. Fully reduced oligomers resembling reduced polyanilines and partially reduced tetramers were also obtained.
Review
Chemistry, Multidisciplinary
Glen R. Jones, Hyun Suk Wang, Kostas Parkatzidis, Richard Whitfield, Nghia P. Truong, Athina Anastasaki
Summary: Controlled polymerization methods allow for the precise design and preparation of polymeric materials. Recent work has shown that these methods also enable depolymerization of polymers under mild conditions. This perspective focuses on depolymerization from polymers synthesized by controlled polymerizations, such as radical, ionic, and metathesis polymerizations, and explores concepts to enhance depolymerization.
JOURNAL OF THE AMERICAN CHEMICAL SOCIETY
(2023)
Article
Polymer Science
Diego A. Resendiz-Lara, Frederik R. Wurm
Summary: In this study, a macromolecular RAFT-chain transfer agent based on polyphosphoester was successfully prepared and used in the synthesis of well-defined block copolymers via RAFT polymerization of various vinyl monomers. Additionally, the PPE-based macro RAFT-CTA was employed as a nonionic surfactant in aqueous emulsion polymerization to produce stable nanoparticles. This combination of polyphosphoesters with RAFT polymerization offers a versatile approach for the synthesis of controlled polymer architectures.
Article
Polymer Science
Rang Chen, Xue Jiang, Guolin Lu, Wenbin Liu, Weize Jin, Guojian Tian, Xiaoyu Huang
Summary: Graft copolymers have versatile applications in material science due to their tunable structure and diverse morphologies. This study successfully synthesized amphiphilic graft copolymers bearing pyridine-containing hydrophilic backbones, which exhibited dual temperature- and pH-sensitive behavior, suggesting their potential as polymer-drug nanocarriers.
Article
Chemistry, Multidisciplinary
Kaiwen Zeng, Yibei Yang, Jianing Xu, Ning Wang, Weiqiang Tang, Jianchen Xu, Yifeng Zhang, Yanruzhen Wu, Yifei Xu, Guowei Wang, Peining Chen, Bingjie Wang, Xuemei Sun, Guoxin Jin, Huisheng Peng
Summary: Constructing the backbones of polymers with metal atoms is a promising strategy to develop new functional polymeric materials, but there are challenges in synthesis. In this study, a series of nickel-backboned polymers with well-defined lengths and up to 21 nickel atoms were successfully constructed using a rational design approach. These polymers exhibited strong and length-dependent absorption and narrow band gaps, making them suitable for applications in optoelectronic devices and semiconductors. Additionally, the nickel-backboned polymers showed high thermal stability and solution processability. This study opens up new possibilities for designing and synthesizing metal-backboned polymers for various applications in the future.
ANGEWANDTE CHEMIE-INTERNATIONAL EDITION
(2023)
Article
Polymer Science
Brian J. Ree, Yusuke Satoh, Kyeong Sik Jin, Takuya Isono, Toshifumi Satoh
Summary: This study provides insights into the micellization behavior and morphologies of bicyclic amphiphiles, showing that different topologies result in distinct structural properties of nanomicelles. The findings suggest that topology-controlled bicyclic block copolymers can be used in various applications, such as drug delivery, biomedical imaging, cosmetics, coating appliances, and molecular electronics.
Article
Polymer Science
Sandeep Sharma, Konstantinos Ntetsikas, Viko Ladelta, Saibal Bhaumik, Nikos Hadjichristidis
Summary: The paper presents an alternative method for the large-scale synthesis of cyclic polymers with moderate dilution conditions up to 1 gram scale. The cyclic polymers were successfully prepared using a simple Williamson etherification reaction with a good solvent/non-solvent combination. Various spectroscopic and analytical techniques, including SEC, MALDI-TOF-MS, DSC, and NMR spectroscopy, were used to fully characterize the synthesized linear and cyclic homopolymers.
Review
Chemistry, Multidisciplinary
Kaixuan Chen, Xing Guo, Mao Chen
Summary: Fluoropolymers have been widely used in industry and academia for their unique physicochemical properties over the past 80 years. Copolymerizations of fluoroalkene feedstocks provide an important pathway to obtain high-performance materials by combining the intrinsic attributes of fluorocarbons and the versatility of comonomers. This minireview discusses the challenges and recent progress in controlled radical copolymerizations of fluoroalkenes with non-fluorinated vinyl comonomers, enabling the preparation of various main-chain fluoropolymers with specific characteristics for high-tech applications.
ANGEWANDTE CHEMIE-INTERNATIONAL EDITION
(2023)
Article
Polymer Science
Sergio Cespedes, Rachel A. Hand, Nikola Chmel, Graeme Moad, Daniel J. Keddie, Tara L. Schiller
Summary: The STMRT strategy was used to produce poly(ethylene glycol)-based model networks, allowing for the establishment of a structure-property relationship. The properties of the model networks can be finely tuned by manipulation of crosslink density and average polymer chain length.
EUROPEAN POLYMER JOURNAL
(2021)
Article
Chemistry, Organic
Mona Hamidzad Sangachin, Samuel Brassard, Mario Leclerc
Summary: Direct (hetero)arylation polymerization (DHAP) is a promising method for the preparation of conjugated polymers that is simple, low cost, and environmentally friendly. However, the selectivity of the coupling reaction has always been a challenge. This study investigated the conditions for C-C couplings between 2-methylthiophene and 2-thiophenecarbonitrile, with one of the partners brominated, and found that the best conditions are achieved when the electron withdrawing moiety is halogenated.
JOURNAL OF ORGANIC CHEMISTRY
(2023)
Review
Chemistry, Inorganic & Nuclear
Yujia Liu, Thanawat Chaiprasert, Armelle Ouali, Masafumi Unno
Summary: This review provides an overview of synthetic routes to different stereoregular CSDs and discusses their potential applications in various fields. The synthesis and functionalization methods of all-cis-T-4 are emphasized, highlighting the possible research directions of CSDs in the future.
DALTON TRANSACTIONS
(2022)
Article
Polymer Science
Alexander A. Puchkov, Nikita G. Sedush, Alexander I. Buzin, Timur N. Bozin, Artem V. Bakirov, Roman S. Borisov, Sergei N. Chvalun
Summary: The main goal of this research is to study the ring-opening polymerization of L-lactide in the presence of multifunctional alcohols in order to determine the optimal conditions for synthesizing star-shaped molecules with predetermined structures for biomedical applications. The study found that the polymerization rate and initiation rate of co-initiator's hydroxyl groups can vary significantly depending on the alcohol's structure and concentration. Various instrumental methods were used to prove the absence of cyclic, linear, and comet-like structures in the synthesized star-shaped PLLA. Additionally, DSC and WAXS analysis showed that branching limits segmental mobility of the PLLA chains and hinders crystallization of the star-shaped poly(L-lactides).
Article
Polymer Science
Yoshihiro Ohta, Chih-Feng Huang, Yi-Huan Lee, Chi-An Dai, Tsutomu Yokozawa
Summary: Well-defined block copolymers consisting of hyperbranched polyamide and polystyrene were synthesized and their self-assembled structures in solutions were investigated. The morphology of the resulting copolymers varied with different compositions and solvent conditions, including the formation of spherical micelles and vesicles.
MACROMOLECULAR CHEMISTRY AND PHYSICS
(2023)
Article
Polymer Science
Paniz Pahlavanlu, Susan Cheng, Alicia M. Battaglia, Garion E. J. Hicks, Charles N. Jarrett-Wilkins, Sloane Evariste, Dwight S. Seferos
Summary: Templated polymerization is a technique used to control the molecular weight and dispersity of conjugated polymers, by generating a template through ring-opening metathesis polymerization and then preparing the final product through chemical oxidative polymerization. This approach allows for the production of well-defined conjugated polymers with controlled properties, such as solubility and molecular weight dispersity.
Article
Chemistry, Multidisciplinary
Geng-Min Lin, Ming-Chuan Cheng, Shun-Jie Liou, Ho-Sung Tsao, Chih-Hsun Lin, Yi R. Lin, Gene-Hsiang Lee, Chun-hsien Chen, Shie-Ming Peng
JOURNAL OF THE CHINESE CHEMICAL SOCIETY
(2019)
Article
Chemistry, Physical
Geng-Min Lin, Chih-Hsun Lin, Hao Howard Peng, Han Hsiao, Tsai-Hui Wang, Ching-Hwa Ho, Hsiu-Fu Hsu, Chun-hsien Chen
JOURNAL OF PHYSICAL CHEMISTRY C
(2019)
Article
Polymer Science
Jian-Jhih Peng, Biswajit Panda, Kamani Satyanarayana, Hau-Ren Yang, Shou-Ling Huang, Mao Jung Huang, Chun-hsien Chen, Guoqiao Lai, Yu-Ying Lai, Tien-Yau Luh
Review
Chemistry, Multidisciplinary
Tien-Yau Luh, Wei-Yu Lin, Guoqiao Lai
CHEMISTRY-AN ASIAN JOURNAL
(2020)
Article
Chemistry, Physical
Chih-Hsun Lin, Geng-Min Lin, Er-Chien Horng, Tzu-Ching Chou, Yi-Chen Liu, Tsai-Hui Wang, Wei-Ling Hua, Hsiu-Fu Hsu, Chun-hsien Chen
JOURNAL OF PHYSICAL CHEMISTRY C
(2020)
Article
Polymer Science
Chih-Hsien Chen, Guo-Qiao Lai, Tien-Yau Luh
Summary: The use of TAE in polymers depends on the distance between TAE linkers and the solvent conditions, resulting in differences in the quantum yield of the formed excimer. Entangling of hexyloxy groups may affect the formation of the excimer.
Article
Chemistry, Physical
Mong-Wen Gu, Hao Howard Peng, I-Wen Peter Chen, Chun-hsien Chen
Summary: Understanding chemical bonding and conductivity at the electrode-molecule interface is crucial for the operation of single-molecule junctions. By applying d-band theory and surface d-band model, it is possible to explain and optimize these devices. Coating Au electrodes with Ag or Cu monolayers can improve the molecule-electrode binding strength and electrical conductivity, attributed to the tuning of the metal's surface d bands.
Review
Chemistry, Multidisciplinary
Hao Howard Peng, Chun-hsien Chen
Summary: Investigations on charge transport at a molecular scale are important for both science and miniaturized electronic devices. This mini-review provides an overview of theoretical and experimental efforts in this field, with a focus on prevalent experimental techniques and the challenges and limitations they present.
JOURNAL OF THE CHINESE CHEMICAL SOCIETY
(2022)
Review
Chemistry, Multidisciplinary
Tien-Yau Luh, Yen-Ju Cheng
Summary: This article summarizes the synthetic efforts on using rhodium-catalyzed hydrosilylation reaction to incorporate different kinds and/or numbers of chromophores arranged regioselectively on the polymeric backbone. The systematic examination of photophysical properties reveals that these silicon-containing polymers exhibit a range of optical behaviors.
JOURNAL OF THE CHINESE CHEMICAL SOCIETY
(2022)
Article
Chemistry, Multidisciplinary
Ming-Chuan Cheng, Gene-Hsiang Lee, Tien-Sung Lin, Yu-Chiao Liu, Ming-Hsi Chiang, Chun-hsien Chen, Shie-Ming Peng
Summary: A synthetic strategy for MAMBMC-type heteronuclear metal-string complexes is demonstrated, and the properties of the complexes are tailored by changing the terminal metals. The structures, electrochemistry, and magnetism of the metal strings are investigated, revealing the influence of the interactions between the terminal metals on the properties of the complexes.
JOURNAL OF THE CHINESE CHEMICAL SOCIETY
(2022)
Article
Chemistry, Multidisciplinary
Tsang-Wei Matt Chen, Yuki Tanaka, Yohei Kametani, Kum-Yi Cheng, Chih-Hsun Lin, Yi Rick Lin, Ting-Rong Hsu, Zuqian Chen, Jiping Hao, Shigeki Mori, Yoshihito Shiota, Kazunari Yoshizawa, Hiroyuki Furuta, Soji Shimizu, Chun-Hsien Chen
Summary: This study scrutinizes the spontaneous assembly of antiaromatic compounds at the liquid-solid interface using scanning tunneling microscopy (STM). The research reveals the polymorphism in monolayers characterized by orthogonal and parallel assemblies at different concentrations. The parallel assembly is found to be more stable and dominantly formed at higher concentrations. Moreover, the narrowing of the HOMO-LUMO gap suggests significant molecular orbital interactions.
ANGEWANDTE CHEMIE-INTERNATIONAL EDITION
(2022)
Article
Chemistry, Multidisciplinary
Mong-Wen Gu, Chih-Ta Lai, I-Chih Ni, Chih- Wu, Chun-hsien Chen
Summary: Fermi's golden rule, a remarkable concept for transition probability, has not been reported in single-molecule junctions with gold electrodes. To increase electron-transport efficiency, gold electrodes were modified with a monolayer of platinum or palladium, which have partially filled d-shells and significant surface density of states at the Fermi energy. The improved junction conductance is attributed to a stronger electrode-molecule coupling and larger participation of d-electrons in the surface density of states.
ANGEWANDTE CHEMIE-INTERNATIONAL EDITION
(2023)
Article
Polymer Science
Yucen Zuo, Yufeng Yao, Chunyu Chen, Yixin Liang, Ke-Fang Yang, Ze Li, Guo-Qiao Lai, Pinglu Zhang, Tien-Yau Luh
Summary: The substituents on cyclopropenes and catalysts have a significant impact on the reactivity and selectivity of ring-opening metathesis polymerization (ROMP). In this study, different chemoselectivities were observed when using piperidine-appended spirocyclopropenes (SCPs) and various Grubbs catalysts. The conformational difference between the piperidine and azetidine motifs plays a crucial role in determining the reactivity, selectivity, and polymerization pathway. This work provides insights into the mechanism of chemoselective ROMP of spirocyclopropenes using Grubbs catalysts and offers guidance for designing new ROMP reactions.
Article
Chemistry, Multidisciplinary
Chieh-Ming Hung, Jin-Tai Lin, Yu-Hsuan Yang, Yi-Chun Liu, Mong-Wen Gu, Tai-Che Chou, Sheng-Fu Wang, Zi-Qin Chen, Chi-Chi Wu, Li-Cyun Chen, Cheng-Chih Hsu, Chun-Hsien Chen, Ching-Wen Chiu, Hsieh-Chih Chen, Pi-Tai Chou
Summary: A new series of zwitterions were designed and synthesized as boundary modulators for improving the performance of inverted perovskite solar cells (PSCs). The zwitterions were found to play important roles in balancing charge carrier transport, suppressing defects, enhancing moisture resistance, and reducing ion migration, leading to significant improvements in the efficiency and stability of the PSCs.
Article
Chemistry, Multidisciplinary
Lei Yu, Guo-Qiao Lai, Pinglu Zhang, Ze Li, Tien-Yau Luh
Summary: Products from cross-coupling reactions of main group elements act as Lewis acids and mediate further reactions. In the presence of nickel catalyst, the olefination of benzylic dithioacetal with MeMgI generates magnesium mercaptide, which selectively converts 2-arylpropene into a dimer. The use of organozinc reagent instead of Grignard reagent improves the yield of the dimers.