Article
Polymer Science
Paul Strasser, Oliver Plavcan, Edip Ajvazi, Helena Henke, Oliver Bruggemann, Ian Teasdale
Summary: Polyphosphazenes are versatile compounds that can be used for bioconjugation, advanced structure synthesis, and material preparation. We developed a method for synthesizing functionalized polyphosphazenes through end-capping and click reactions. This method can be used to prepare gels based on polyphosphazenes.
JOURNAL OF POLYMER SCIENCE
(2022)
Article
Chemistry, Applied
M. L. Ligi, A. Abhilash, Sreekanth J. Varma, P. A. Unnikrishnan, S. Prathapan, S. Jayalekshmi
Summary: Two novel segmented block copolymers, NPPV1 and NPPV2, were synthesized and characterized for their substituent effects on properties, structure-property relationships, and suitability for polymer light emitting diodes. The study highlighted the importance of cost-effective synthesis methods in developing polymers for efficient LED design in high frequency blue emission.
Article
Chemistry, Multidisciplinary
Manhao Zeng, Yu-Hsuan Lee, Garrett Strong, Anne M. LaPointe, Andrew L. Kocen, Zhiqiang Qu, Geoffrey W. Coates, Susannah L. Scott, Mahdi M. Abu-Omar
Summary: This study demonstrates a new approach for recycling polyethylene plastic, upgrading it to higher value-added divinyl oligomers with high yields through a sequence of reactions. The three-step process is economically viable on an industrial scale, converting discarded polyethylene into value-added chemicals for various applications.
ACS SUSTAINABLE CHEMISTRY & ENGINEERING
(2021)
Article
Polymer Science
Alexander Kleine, Ulrich S. Schubert, Michael Jaeger
Summary: This study investigates the preparation of poly(N-alkyl-3,6-carbazole)s with defined alpha-/omega-end groups using a commercial Buchwald-type pre-catalyst. It is found that an excess of monofunctional aryl halide favors the Suzuki-Miyaura catalyst-transfer polymerization (SCTP) mechanism, resulting in heterotelechelic polymers with defined molar masses, narrow dispersities, and high chemical yields.
Review
Polymer Science
Di Zhou, Liang-Wei Zhu, Bai-Heng Wu, Zhi-Kang Xu, Ling-Shu Wan
Summary: This review comprehensively summarizes the synthetic methods to prepare end-functionalized polymers fabricated by CLRP techniques, including ATRP, RAFT, SFRP, iniferters, ITP, CMRP, and OMRP. The methods basically follow the principles of taking advantage of functional initiators or post-modifying the reactive chain-ends to obtain a wide variety of mono- or di-end-functionalized polymers.
Article
Biochemistry & Molecular Biology
Anca-Dana Bendrea, Luminita Cianga, Gabriela-Liliana Ailiesei, Demet Goen Colak, Irina Popescu, Ioan Cianga
Summary: This paper reports the synthesis of a new oligo(2-methyl-2-oxazoline) (OMeOx)-containing thiophene macromonomer and its versatile functional properties. The self-assembled structures formed by this macromonomer in water showed concentration-dependent fluorescence emission and excitation-dependent luminescence. The behavior of this material resembles that of polypeptides.
INTERNATIONAL JOURNAL OF MOLECULAR SCIENCES
(2022)
Article
Polymer Science
Benedetta Palucci, Giorgia Zanchin, Giovanni Ricci, Laure Vendier, Christian Lorber, Giuseppe Leone
Summary: In this study, the terpolymerization of two alpha,omega-dienes with ethylene and various cyclic olefins catalyzed by a chelated imido vanadium complex was investigated. The resulting polyolefins showed high molecular weight, narrow molecular weight distribution, subambient glass transition temperatures, and proper content of C=C bonds. NMR analysis of the obtained polymers revealed the influence of subtle changes in the alpha,omega-diene size on the insertion paths during the polymerization process.
Article
Crystallography
Jin Motoyanagi, Ayane Fujishima, Masahiko Minoda
Summary: This study investigates a new amphipathic poly(vinyl ether) with an SP moiety, exploring its photoresponsive properties and the control of self-assembly through photoirradiation.
Article
Chemistry, Analytical
Yue Mou, Peng Yin, Meiyun Chen, Chonghui Wei, Yanfei Zhang, Jiaheng Zhang, Yujie Zhao, Xingyu Luo, Yilin Wang
Summary: In this study, an aptamer-functionalized DNA fluorescent sensor (AFDS) was proposed for accurate and specific detection of Cu-(II) both in vitro and in cells. The AFDS showed high specificity, selectivity, and sensitivity in Cu-(II) response, enabling the detection of Cu-(II) in a wide linear range. The AFDS has great potential in exploring copper-related biological and pathological research.
ANALYTICAL CHEMISTRY
(2023)
Article
Chemistry, Multidisciplinary
Wuchao Zhao, Jianghua He, Yuetao Zhang
Summary: Lewis pair polymerization (LPP) has shown great advantages in the polymerization of (meth)acrylate monomers, including high activity, stability, and adjustable variability. This feature article reviews the recent progress made by a research group in living/controlled polymerization using various types of Lewis pairs (LPs). The developed LPPs have precise control over the molecular weight, molecular weight distribution, monomer sequence, and topology of polymers. This review serves as a valuable resource for researchers in the field of LPP and those interested in synthesizing new materials through LPP.
SCIENCE CHINA-CHEMISTRY
(2023)
Article
Chemistry, Multidisciplinary
Yari Foelen, Nieke J. M. van Gils, Mart D. T. Claessen, Albertus P. H. J. Schenning
Summary: The UV intensity during photopolymerization can control the structural color of a polymer photonic coating, and the low intensity photopolymerization can increase the inhibition time, leading to the formation of polymer fragments. These fragments change the matrix and result in color change before the polymer network is formed. Additionally, the fragments act as a plasticizer, lowering the glass transition temperature. This method can be combined with temperature responsive properties to fabricate photonic coatings with multiple colored patterns.
CHEMICAL COMMUNICATIONS
(2022)
Article
Nanoscience & Nanotechnology
Tyus J. Yeingst, Julien H. Arrizabalaga, Ferdousi S. Rawnaque, Lindsay P. Stone, Amar Yeware, Angelica M. Helton, Aman Dhawan, Julianna C. Simon, Daniel J. Hayes
Summary: This study developed an ultrasound-responsive polymer system that can degrade on demand when exposed to high-intensity focused ultrasound (HIFU). Diels-Alder cycloadducts were used to crosslink polycaprolactone (PCL) polymers and underwent a retro Diels-Alder reaction under HIFU stimulation. The relationship between reverse reaction energy barriers and polymer degradation rates was evaluated for two Diels-Alder polymer compositions. HIFU exposure time and amplitude were found to correlate with an increase in PCL degradation for Diels-Alder-based polymers. The study demonstrated that HIFU is an effective image-guided stimulus to control the degradation of Diels-Alder-based PCL polymers on-demand.
ACS APPLIED MATERIALS & INTERFACES
(2023)
Article
Polymer Science
James McQuade, Mya I. Serrano, Frieder Jakle
Summary: The incorporation of main group elements into polymers enables the synthesis of functional materials with unique molecular structures and chemical properties. Ring-opening metathesis polymerization (ROMP) is a versatile method for generating new main group element-functionalized materials.
Article
Chemistry, Organic
Joydev K. Laha, Upma Gulati, Anjali Gupta
Summary: A decarboxylative amidation of aryl/heteroarylacetic acids by reaction with NHS and tert-butyl nitrite has been reported, which offers a convenient method for the synthesis of aliphatic and (hetero)aromatic amides. Mechanistic studies reveal a previously unexplored pathway involving traceless alpha-functionalized benzylic radicals for the formation of activated ester, followed by one-pot reaction with amines to form amides. The gram-scale synthesis of Moclobemide demonstrates the practical applicability of this method.
Article
Chemistry, Multidisciplinary
Xiangke Li, Shi-Yang Tang, Yang Zhang, Jiayuan Zhu, Helen Forgham, Chun-Xia Zhao, Cheng Zhang, Thomas P. Davis, Ruirui Qiao
Summary: Droplet-based microfluidics is a significant technology that can be improved by using fluoropolymer-based surfactants to enhance stability and biocompatibility.
ANGEWANDTE CHEMIE-INTERNATIONAL EDITION
(2023)
Article
Polymer Science
Huan Li, Yingying Li, Yudan Wang, Lijia Liu, Hongxing Dong, Chunhong Zhang, Toshifumi Satoh
Summary: In this study, a Lys-BPEA crosslinker was synthesized using primary amines rich in lysine end groups. An antibacterial self-healing hydrogel (PAA/Lys-BPEA) was prepared by introducing polyamine Lys-BPEA into PAA via ionic bonding and electrostatic interaction. The PAA/Lys-BPEA hydrogel exhibited excellent antibacterial and self-healing properties, making it an ideal choice for the design of smart self-healing devices and antibacterial surface coatings.
Article
Polymer Science
Ryohei Sato, Atsuo Utagawa, Koji Fushimi, Feng Li, Takuya Isono, Kenji Tajima, Toshifumi Satoh, Shin-ichiro Sato, Hiroshi Hirata, Yoshihiro Kikkawa, Takuya Yamamoto
Summary: The redox behaviors of macrocyclic molecules with an entirely pi-conjugated system were investigated in this study. Cyclic P3HT with different degrees of polymerization (DPn) were synthesized, and its unique redox behaviors were compared with linear P3HT. Cyclic P3HT showed a decrease in HOMO level and greater stability during cyclic voltammetry measurement, indicating stronger dicationic properties due to polaron-polaron interactions.
Article
Chemistry, Multidisciplinary
Erika Terada, Takuya Isono, Toshifumi Satoh, Takuya Yamamoto, Toyoji Kakuchi, Shinichiro Sato
Summary: Recently, temperature-responsive polymers tethered to oligooxyethylene side chains terminated with alkyl groups were experimentally investigated. Molecular dynamics simulations were used to study aqueous solutions of poly(glycidyl ether)s with different numbers of oxyethylene units. The thermal responses of chain extensions, hydrogen bond recombination, and water-solvation shells were analyzed. The phase-transition temperature was not directly related to the polymer-chain extensions, but the temperature response of the water-solvation shell around the alkyl group showed a noticeable correlation. The relationship between TCRP and TCLP was found to be affected by polymer-chain fluctuation.
Article
Chemistry, Applied
Satoshi Katsuhara, Naoki Sunagawa, Kiyohiko Igarashi, Yutaka Takeuchi, Kenji Takahashi, Takuya Yamamoto, Feng Li, Kenji Tajima, Takuya Isono, Toshifumi Satoh
Summary: This study synthesized cellulose acetate-based TPEs with different degrees of substitution (DS) and investigated the impact of DS on their structure and properties. The results showed that decreasing DS led to the formation of a more ordered microphase-separated structure, improved toughness, suppressed stress relaxation, and enhanced biodegradability potential. This work demonstrates the potential of cellulose acetate-based TPEs as next-generation sustainable materials.
CARBOHYDRATE POLYMERS
(2023)
Article
Chemistry, Multidisciplinary
Hien Thi Phan, Shoko Furukawa, Koto Imai, Hiroya Tomita, Takuya Isono, Toshifumi Satoh, Ken'ichiro Matsumoto
Summary: Bacterial polyhydroxyalkanoate (PHA) synthase PhaC(AR) and its mutated variants were used to synthesize block copolymers with poly(d-lactate) (PDLA) segments. Beneficial mutations N149D and F314H increased the incorporation of D-lactate (LA) units, resulting in the synthesis of P(3HB)-b-PDLA and P(3HHx)-b-PDLA. This study demonstrates a new method for the synthesis of block copolyesters with isotactic PDLA segments from renewable resources using engineered polyester synthase.
ACS SUSTAINABLE CHEMISTRY & ENGINEERING
(2023)
Article
Polymer Science
Yamato Ebii, Yoshinobu Mato, Feng Li, Kenji Tajima, Takuya Yamamoto, Takuya Isono, Toshifumi Satoh
Summary: In this study, multicyclic polystyrene (mc-PS) was successfully synthesized through the cyclopolymerization of alpha,omega-dinorbornenyl end-functionalized PS macromonomers mediated by the Grubbs third-generation catalyst. The number of cyclic units in the obtained mc-PS was controlled by adjusting the macromonomer-to-G3 ratio, with a maximum of 239 units achieved. The developed cyclopolymerization strategy provides a new approach for the synthesis of multicyclic polymers and has significant implications for fundamental studies and material applications.
Article
Chemistry, Multidisciplinary
Yaodong Wang, Yudan Wang, Lijia Liu, Kexiao Sang, Chunhong Zhang, Toshifumi Satoh
Summary: Metal-free catalysts have emerged as an important research focus in catalysis due to the growing concern over heavy metal pollution. In this study, a heterogeneous catalyst, l-Pro-l-Pro-l-Phe-l-Phe-OMe, was synthesized by connecting an aromatic amino acid dipeptide (l-Phe-l-Phe-OMe) with a proline dipeptide (l-Pro-l-Pro) through solid phase synthesis. The catalyst's structure was characterized using SEM, XRD, NMR, and FTIR spectroscopy, with X-ray diffractometry revealing a rod crystal structure. Furthermore, l-Pro-l-Pro-l-Phe-l-Phe-OMe exhibited superior catalytic activity compared to a homogeneous small molecule catalyst (high enantioselectivity, ee > 97%) in heterogeneous asymmetric aldol reactions and demonstrated good recyclability.
REACTION CHEMISTRY & ENGINEERING
(2023)
Article
Polymer Science
Takuya Isono, Ema Baba, Shunma Tanaka, Ken Miyagi, Takahiro Dazai, Feng Li, Takuya Yamamoto, Kenji Tajima, Toshifumi Satoh
Summary: By direct post-polymerization modification, commercial PS-b-PMMA can be successfully transformed into ordered microphase-separated structures with a periodicity as low as approximately 16 nm. The installation of adamantyl group not only increases incompatibility with the PMMA block, but also improves thermal stability, glass transition temperature, and etching contrast.
Article
Polymer Science
Yaodong Wang, Lijia Liu, Yudan Wang, Kexiao Sang, Chunhong Zhang, Toshifumi Satoh
Summary: An l-phenylalanine dipeptide monomer was cross-linked to form a chiral porous polymer skeleton, which was then modified with l-proline to produce a catalyst with a higher specific surface area. The catalyst exhibited improved catalytic efficiency and selectivity in asymmetric Michael addition and Mannich reactions. The recyclable and cost-effective nature of the catalyst makes it an effective strategy for preparing high-performance asymmetric catalysts.
Article
Polymer Science
Kai Chen, Chun -Yu Chen, Hsin-Lung Chen, Ryoya Komaki, Nao Kawakami, Takuya Isono, Toshifumi Satoh, Du -Yuan Hung, Ying-Ling Liu
Summary: The molecular architecture and configuration of sugar-based block copolymers have significant effects on their self-assembly behavior. In this study, we observed the formation of double gyroid and hexagonal perforated layer structures in monodisperse maltose-solanesol block copolymers with different architectural configurations. The oligomeric nature of the copolymers amplified the role of the configuration prescribed by the substituted positions of the block chains.