Article
Polymer Science
Leanne M. Stafast, Nora Engel, Helmar Goerls, Christine Weber, Ulrich S. Schubert
Summary: In this study, 2-(4-(iodomethyl)benzyl)isoindoline-1,3-dione was used as a protected amine-functionalized initiator for the cationic ring opening-polymerization (CROP) of 2-ethyl-2-oxazoline. The polymerization was well-controlled and terminated with sodium azide. Subsequent deprotection allowed for attachment of targeting ligands to the polymer. The heterotelechelic PEtOx was then coupled to end-functionalized polylactide to form block copolymers for nanomedicine.
EUROPEAN POLYMER JOURNAL
(2023)
Article
Biochemistry & Molecular Biology
Ryo Tanaka, Yuina Kuwabara, Yuushou Nakayama, Takeshi Shiono
Summary: This study investigated the copolymerization of diene comonomers bearing boronic acid masked with 1,8-diaminonaphthalene (dan) with isoprene or butadiene, using a neodymium borohydride complex as a catalyst. The comonomers showed tolerance to excess modified methylaluminoxane (MMAO) and were applicable to a polymerization system using MMAO. However, the corresponding pinacol borate was highly reactive towards MMAO and did not incorporate into the obtained polymer. C-13 NMR analysis revealed that all the comonomers were located at the chain end of the hydrogenated copolymer. Further functionalization using the boron moiety at the polymer chain end was also investigated.
Article
Polymer Science
Tuemay Abadi Belay, Jupeng Chen, Huan Xu, Shaowen Zhang, Shilu Chen, Xiaofang Li
Summary: The study presents a method for the synthesis of silane-end-functionalized linear and star polymers through metal-free borates or borane mediated polymerization, with properties easily tunable by varying the type and concentration of hydrosilanes. H-1, Si-29, and H-1-Si-29 HMBC NMR, FT-IR, ESI-MS, and MALDI-TOF-MS analyses confirm the presence of silane-end-functional groups in these polymers, with hydrosilanes playing a dual role in the polymerization process.
Article
Biochemical Research Methods
Akira Matsumoto, Shigehito Osawa, Takahiro Arai, Yukie Maejima, Hidenori Otsuka, Yuji Miyahara
Summary: The study demonstrates a label-free, enzymatic-free, potentiometric determination of fetuin using boronic acid-based SA-recognition chemistry on a gold electrode. The method shows a micro M-order sensitivity comparable to blood-collected specimens, suggesting potential for developing a cost-effective hemodiagnostic technology with ease of downsizing and mass production.
BIOCONJUGATE CHEMISTRY
(2021)
Article
Polymer Science
Jiawei Chen, Wenbing Wang, Yao Pan, Dan Peng, Yougui Li, Chen Zou
Summary: In this study, direct copolymerization of plant oil-based copolymer monomers with ethylene was achieved using a dienyl phosphoribosulfonyl palladium catalyst (PO-Pd). Addition, ureido-pyrimidinone (UPy) functionalization was performed using the hydroxyl group of the polymer. The incorporation of biomass groups effectively modifies the surface and mechanical properties of the copolymers, and these newly developed polymers are ideal tougheners for gutter oil due to their excellent tunability of the self-complementary hydrogen bonding network (UPy).
Article
Polymer Science
Pedro Salas-Ambrosio, Antoine Tronnet, Mostafa Badreldin, Luzangel Reyes, Marc Since, Sandra Bourgeade-Delmas, Bruno Dupuy, Pierre Verhaeghe, Colin Bonduelle
Summary: New macromolecular engineering approaches were developed to prepare star-like polypeptoids through ring-opening polymerization. Evaluation of their cytotoxicity on HepG2 human cell line and screening against a variety of Gram-positive and Gram-negative bacteria identified several compounds with both good and selective antimicrobial activity.
Article
Polymer Science
Henry Foster, Martina H. Stenzel, Robert Chapman
Summary: Compared to conventional techniques, photoinitiated electron/energy transfer-reversible addition-fragmentation chain transfer (PET-RAFT) allows for better control over the polymerization of multiblock star copolymers, avoiding the generation of termination products. This technique is also tolerant to oxygen, enabling the automated synthesis of multiblock star copolymers at short block lengths, providing a useful approach for screening the effect of polymer composition on solution structure.
Article
Engineering, Chemical
Poovathungal Abdulrahman Jeemol, Suresh Mathew, Chethrappilly Padmanabhan Reghunadhan Nair
Summary: Blending nadimide end-capped polyether with UPER resin enhances cohesive energy and crosslinking, significantly improving fracture characteristics. Adding a small amount of nadimide end functional polyether increases toughness, but further addition has no effect on crosslink density.
POLYMER ENGINEERING AND SCIENCE
(2021)
Article
Polymer Science
Peter J. Mons, Nora Fribiczer, Kathrin Kowalczuk, Purushottam Poudel, Sebastian Seiffert, Felix H. Schacher
Summary: In this study, we report the synthesis of a novel double hydrophilic star-shaped block copolymer and investigate its solution properties under different solution pH conditions. We find that even short stickers can enhance the aggregation tendency at low pH values, resulting in aggregate sizes beyond 1 μm.
Article
Chemistry, Inorganic & Nuclear
Nam Young Ahn, Jooyeon Lee, Wonjune Yeo, Hyojin Park, Jiyun Nam, Min Kim, Myungeun Seo
Summary: We have developed a synthetic method for decorating the surface of metal-organic frameworks (MOFs) with polymers through postsynthetic modification. By reacting well-defined polymers with reversibly deactivated radical species at their chain end with vinyl-functionalized MOFs in the presence of a radical initiator, we can form a C-C bond between the polymer end and the functional group at the MOF ligand. We have successfully achieved four polymer@MOF composites through this method.
INORGANIC CHEMISTRY
(2022)
Article
Chemistry, Multidisciplinary
Danyon M. Fischbach, Katharina A. Krstic, Lawrence R. Sita
Summary: The living coordinative copolymerization of 1-alkenes with 4-aryl-1,6-heptadienes, both with and without a reversible chain transfer agent, allows for the production of functionalized polyolefins with various end-groups and functional groups. The non-conjugated diene comonomers can be easily obtained from a range of aryl carboxaldehyde precursors. These results provide a new platform for exploring functionalized polyolefins on a larger scale.
ANGEWANDTE CHEMIE-INTERNATIONAL EDITION
(2023)
Article
Chemistry, Multidisciplinary
Shujun Li, Yubin Ma, Yue Zhao, Rongji Liu, Yupeng Zhao, Xusheng Dai, Nana Ma, Carsten Streb, Xuenian Chen
Summary: The study demonstrates the activation of molecular hydrogen by polyoxometalate (POM)-based heterogeneous compounds functionalized with Platinum particles. The synergism between a hydrogen spillover mechanism and electron-proton transfer by the POM enables the selective catalytic reduction of olefins and nitroarenes with high functional group tolerance.
ANGEWANDTE CHEMIE-INTERNATIONAL EDITION
(2023)
Article
Polymer Science
Chaoqun Wang, Shilong Wu, Quan Chen, Hongliang Mu, Zhongbao Jian
Summary: This study reports a method for synthesizing star polyethylene using multinuclear nickel catalysts, which results in star polyethylenes with ultrahigh molecular weights and excellent properties.
Article
Chemistry, Analytical
Hazha Omar Othman, Rebwar Omar Hassan, Azad Tawfiq Faizullah
Summary: This study presents a simple and effective method for detecting glucose using boronic acid-functionalized sulfur-doped carbon nanodots, which provides excellent selectivity and resistance to interference. The developed chemosensor successfully measures glucose in human saliva with a detection limit of 0.57 mu M.
MICROCHEMICAL JOURNAL
(2021)
Article
Chemistry, Multidisciplinary
Meifang Liu, Li Liu, Zhihui Zhang, Meixiu Wan, Huanmei Guo, Dan Li
Summary: Combining Pd(0) with a bulky phosphine ligand can efficiently synthesize thiophene-containing polymers and improve the yield. Using this active catalyst system, high molecular weight thiophene-containing polymers can be successfully prepared in a shorter reaction time.
FRONTIERS IN CHEMISTRY
(2021)
