Article
Polymer Science
Guan-Lin Liu, Hsin-Wei Wu, Zheng-Ian Lin, Min-Gan Liao, Yu-Chia Su, Chih-Kuang Chen, Bao-Tsan Ko
Summary: Functionalized polycarbonates from carbon dioxide have been synthesized using efficient catalysis strategies with dinuclear nickel catalysts. These polycarbonates have shown unique applications in the field of biomaterials, showcasing their potential for diverse biomedical functions.
Article
Pharmacology & Pharmacy
Radhakanta Ghosh, Yuvaraj Arun, Peter Siman, Abraham J. Domb
Summary: Polyanhydrides are synthesized by melt-polycondensation of diacid monomers and excess acetic anhydride to form stable polymers with controlled molecular weight. The synthesized aliphatic polyanhydrides have controllable molecular weight and low polydispersity, making them suitable for potential use as drug carriers. In vitro drug release studies show promising results for poly(sebacic acid) as a candidate for controlled drug delivery applications.
Review
Chemistry, Multidisciplinary
Dian-Feng Chen, Liu-Zhu Gong
Summary: This article introduces the fundamental attributes of asymmetric organo/transition-metal combined catalysis (AOMC), explains how organocatalysts and transition-metal complexes collaborate, and discusses future opportunities in this field.
JOURNAL OF THE AMERICAN CHEMICAL SOCIETY
(2022)
Article
Chemistry, Multidisciplinary
Ruoyu Li, Shudi Zhang, Quanshun Li, Greg G. Qiao, Zesheng An
Summary: This study presents a novel enzymatic cascade catalysis for high-throughput synthesis of ultrahigh molecular weight polymers. The enzymatic cascade, consisting of formate oxidase and horseradish peroxidase, enables reversible addition-fragmentation chain transfer synthesis of polymers at extremely low volumes. This method offers a green and efficient approach for the synthesis of well-defined polymers without waste accumulation.
ANGEWANDTE CHEMIE-INTERNATIONAL EDITION
(2022)
Article
Polymer Science
Panagiotis Bexis, Julien De Winter, Maria C. Arno, Olivier Coulembier, Andrew P. Dove
Summary: The synthesis of well-defined propargyl-functional aliphatic polycarbonates is achieved using commercially available or readily made, shelf-stable organocatalysts, resulting in homopolymers with low dispersities and end-group fidelity, and demonstrating the versatility of the system through the synthesis of telechelic copolymers and block copolymers with molar mass up to 40 kDa.
MACROMOLECULAR RAPID COMMUNICATIONS
(2021)
Article
Polymer Science
Jixiang Ni, Matteo Lanzi, David H. Lamparelli, Arjan W. Kleij
Summary: A series of bicyclic carbonates with different functionalities have been prepared through various chemical reactions, which can be polymerized to obtain polycarbonates with diverse properties. This method provides an effective approach to synthesize functional polymer materials.
Article
Thermodynamics
Lipeng Liu, Ying Lu, Mingze Xia, Bo Wang, Yi Cheng, Zhiyong Wei
Summary: Aliphatic polycarbonates (APCs) have been synthesized using dimethyl carbonate (DMC) and different lengths of aliphatic diols, showing increased flexibility and crystallization with more methylene groups in the repeating units. However, the rigidity of the ester group affected the strength and Young's modulus of APCs, which decreased and then increased. Brill transition increased the distance between intermolecular chains, affecting the barrier properties of poly(octamethylene carbonate).
JOURNAL OF THERMAL ANALYSIS AND CALORIMETRY
(2023)
Article
Polymer Science
Chengliang Wang, Xu Zhang, Wei Zhao, Xin Liu, Qingfu Wang, Jingjiang Sun
Summary: This study introduces a novel organo-catalyzed method for the synthesis of hyperbranched aliphatic polycarbonates (HBPCs). The method allows for precise control over the HBPC structure and the introduction of different functional groups. HBPCs have significant potential for biomedical applications.
Article
Chemistry, Multidisciplinary
Zifeng Yang, Xue Li, Fei Xu, Weiwei Wang, Yongqing Shi, Zhencai Zhang, Wenjuan Fang, Lei Liu, Suojiang Zhang
Summary: This study focuses on the green synthesis of poly(isosorbide carbonate) (PIC) using a one-step melt polycondensation process, catalyzed by newly synthesized ionic liquids. The study found that the structure of cations and anions of the catalysts significantly influenced the catalytic performance in polymer synthesis reactions, with [N-2222](2) [HQ] identified as the most efficient catalyst. Additionally, a possible mechanism for the synergetic catalysis promoting chain growth was proposed based on detected intermediates and analytical results.
Article
Chemistry, Physical
Wenjuan Fang, Fei Xu, Yaqin Zhang, Heng Wang, Zhencai Zhang, Zifeng Yang, Weiwei Wang, Hongyan He, Yunjun Luo
Summary: This study developed a facile and phosgene-free method for synthesizing bio-based polycarbonate using isosorbide and dimethyl carbonate, with the use of acylamido-based ionic liquids as catalysts. The catalytic performance of these ILs was evaluated, showing that those with low anion-cation interaction energy and high atomic charges of the nitrogen atom exhibited good performance. By using tetrabutylphosphonium phthalimide as a catalyst, the selectivity of carboxymethylation of DMC and conversion of ISB significantly increased, pointing to a potential synergistic catalytic mechanism involving cation-anion interactions.
CATALYSIS SCIENCE & TECHNOLOGY
(2022)
Review
Polymer Science
Geetanjali Shukla, Robert C. Ferrier
Summary: PECH is a functional polyether synthesized by the ring opening polymerization of ECH, its inexpensive precursor, in the 1950's. ECH is an ideal feedstock for polymer materials due to its functional, inexpensive, and environmentally friendly production, but polymerizations involving ECH are difficult due to the alkyl chloride pendant.
JOURNAL OF POLYMER SCIENCE
(2021)
Article
Chemistry, Multidisciplinary
Jinbo Zhang, Lebin Wang, Shaofeng Liu, Zhibo Li
Summary: Organophosphazenes combined with triethylborane were used as binary organocatalysts for the copolymerization of CO2 and epoxides, showing high activity and selectivity dependent on the nature of phosphazenes. 2,4,6-Tris[tri(1-pyrrolidinyl)-iminophosphorane]-1,3,5-triazine exhibited unprecedented efficiency in producing CO2-based polycarbonates at 1 MPa of CO2 and room temperature.
ANGEWANDTE CHEMIE-INTERNATIONAL EDITION
(2022)
Article
Chemistry, Organic
Yu Zhang, Jiahui Qian, Miao Wang, Yahao Huang, Peng Hu
Summary: An efficient and low-cost protocol for the direct decarboxylative fluorination of aliphatic carboxylic acids catalyzed by iron salts under visible light is presented. This new method is highly efficient and scalable, and mechanistic studies have revealed the generation process of the key step.
Article
Chemistry, Multidisciplinary
Weiwei Wang, Zifeng Yang, Yaqin Zhang, Hongyan He, Wenjuan Fang, Zhencai Zhang, Fei Xu
Summary: The study developed an efficient catalytic system composed of deep eutectic solvents (DESs) by adjusting the basicity of hydrogen bond donors (HBDs) to synthesize poly(isosorbide) carbonate (PIC) with high weight average molecular weight (M-w). Near-neutral catalysts were found to be more conducive to the M-w of PIC.
Article
Chemistry, Multidisciplinary
Ji Yang, Jiawang Liu, Yao Ge, Weiheng Huang, Francesco Ferretti, Helfried Neumann, Haijun Jiao, Robert Franke, Ralf Jackstell, Matthias Beller
Summary: By introducing 1,2-bis-di-tert-butylphosphin-oxylene (dtbpx) ligands, palladium-catalysed dicarbonylation of 1,3-butadiene can achieve high selectivity and efficiency, leading to a more cost-effective and environmentally friendly industrial production process.
ANGEWANDTE CHEMIE-INTERNATIONAL EDITION
(2021)
Article
Polymer Science
Paige A. Shaw, Maxime Klausen, Mark Bradley
Summary: A light-responsive polymer capable of controlled release of camptothecin and generation of reactive oxygen species (ROS) was developed, which exhibited high cancer cell killing activity through both camptothecin release and ROS generation.
Article
Polymer Science
Donghui Zhang, Shiqi Liu, Zhihao Cai, Weizhe Luo, Guojian Liu, Runhui Liu
Summary: A straightforward and efficient method for synthesizing NPC monomers has been developed in this study, which enhances the availability of NPC monomers and facilitates the synthesis of polypeptides.