Article
Materials Science, Characterization & Testing
Qiang Wang, Shiqi Xie, Zhe Hua, Hui Niu
Summary: 4-Furfuryloxymethylstyrene (S-f) grafted isotactic polypropylene (iPP-g-S-f) was prepared by melt grafting reaction. The crystallization temperature of iPP after grafting increased and the crystallization rate was accelerated, resulting in smaller crystal morphology. The introduction of a small amount of S-f groups reduced the surface free energy of the crystals.
Article
Polymer Science
Yang Jiang, Zhen Zhang, Hanqing Jiang, Qiyuan Wang, Shihui Li, Dongmei Cui
Summary: This study investigates the copolymerization of ethylene with 6-phenoxy-1-hexene using different sterically hindered scandium precatalysts. Results show that activated precatalyst 1 exhibits high activity (1.4 x 105 g molSc(-1) h(-1)) but low POH incorporation ratio (0.7 mol %), while precatalyst 2 has significantly reduced activity (0.1 x 105 g molSc(-1) h(-1)). Halfsandwich scandium precatalyst 3 shows higher activity (8.1 x 105 g molSc(-1) h(-1)) and produces a copolymer with 7.0 mol % POH. The highest activity (18.0 x 105 g molSc(-1) h(-1)) and incorporation ratio (8.6 mol %) are achieved by precatalyst 4. After optimizing the reaction conditions, up to 16 mol % of POH can be incorporated into the copolymer produced with precatalyst 4.
Article
Biochemistry & Molecular Biology
Maximilian Scherger, Yannick A. Pilger, Judith Stickdorn, Patric Komforth, Sascha Schmitt, Kaloian Koynov, Hans Joachim Raeder, Lutz Nuhn
Summary: The reversible addition-fragmentation chain-transfer (RAFT) polymerization allows the synthesis of biocompatible and functional macromolecules for polymer-drug conjugates. By utilizing traceless linkers, the drug conjugates can be reversibly attached to and released from the polymer chain. This approach is particularly relevant for poly(N,N-dimethylacrylamide) (pDMA), which has shown similar properties to poly(ethylene glycol) (PEG) in improving drug pharmacokinetics and bioavailability. The incorporation of various functionalities in a one-pot reaction procedure has been demonstrated, along with reversible conjugation and traceless release. Moreover, the internalization of polymer-drug conjugates at the cellular level has been achieved using cholesterol-modified RAFT chain-transfer agents.
Article
Engineering, Chemical
Dafu Cao, Fengmin Nie, Min Liu, Xiaowei Sun, Bangbang Wang, Fei Wang, Nanwen Li, Bin Wang, Zhe Ma, Li Pan, Yuesheng Li
Summary: Reactive polyolefin intermediates were synthesized to obtain polyolefin-based anion exchange membranes (AEMs) with high performance. These AEMs exhibited high hydroxide conductivity and excellent alkaline stability, as well as evident microphase separation and low swelling ratio.
JOURNAL OF MEMBRANE SCIENCE
(2022)
Article
Chemistry, Inorganic & Nuclear
Hanhua Xu, Ze-Jie Lv, Junnian Wei, Zhenfeng Xi
Summary: A N-aryloxide-amidine ligand (H3L) was synthesized from 2-(aminomethyl)-6-(tert-butyl)phenol in two steps, which integrates phenoxide and amidine ligands through methylene linkers. The coordination modes of the resulting complexes depend on the radius of the metal ions. The ligand can form a dimer (LMIV-Cl)2 with group 4 metal chloride (MCl4)-Cl-IV, and the coordination mode of the amidinate moiety can change from bidentate chelating to bimetallic bridging coordination.
DALTON TRANSACTIONS
(2023)
Article
Polymer Science
Junkun Fan, Ning Ren, Chongyin Zhang, Mao Li, Xinyuan Zhu, Gangsheng Tong
Summary: This study reports the synthesis of hyperbranched polyolefins using a one-pot process and a bi-functional acyclic olefin as a chain-transfer agent. The method provides a new route for the synthesis of functional hyperbranched polyolefin materials.
Article
Engineering, Chemical
Wei-Cheng Yan, Tao Dong, Yin-Ning Zhou, Zheng-Hong Luo
Summary: Since the synthesis of polypropylene in 1954, significant progress has been made in the production of polypropylene, transitioning it from a laboratory discovery to an indispensable industrial product. However, the precise control of the synthesis process to tailor the microstructure and properties remains a challenging issue. Mathematical models have been developed to establish the quantitative relationships between the microstructure and macroscopic properties at various scales, and this review provides an overview of the progress in computational modeling of polypropylene production. It covers aspects such as synthesis, structure-property relationship, reactor design, processing, composites, and applications.
CHEMICAL ENGINEERING SCIENCE
(2023)
Article
Chemistry, Multidisciplinary
Samantha O. Catt, Maximillian Hackner, Joachim P. Spatz, Eva Blasco
Summary: By utilizing sequence-defined macromolecules, researchers have successfully designed and printed precise macromolecular inks for 3D microprinting, creating a promising avenue for the development of next-generation functional materials for 3D printing.
Review
Polymer Science
Teng-Wei Wang, Matthew R. Golder
Summary: The exploration of macromolecular topology provides common ground amongst chemists, material scientists, mathematicians, and artists. Different polymer architectures have unique physical properties and their topological-dependent properties are a fusion of symmetry and polymer physics. Specifically, cyclic macromolecules have distinct characteristics compared to their linear counterparts due to the lack of chain ends.
Review
Polymer Science
James M. Eagan
Summary: This paper reviews an efficient route for converting sustainable carbon feedstocks into novel macromolecules by catalytic conversion of carbon dioxide and 1,3-butadiene into unsaturated lactone monomers. The chemical reactivity of this monomer and various polymerization methods are discussed, along with the functional properties of materials derived from these processes. The advances in polymer chemistry and future directions of the field are also highlighted.
MACROMOLECULAR RAPID COMMUNICATIONS
(2023)
Article
Chemistry, Multidisciplinary
Xiaobing Shi, Valentin A. Bobrin, Yin Yao, Jin Zhang, Nathaniel Corrigan, Cyrille Boyer
Summary: This study utilizes multi-arm macroCTAs to mediate polymerization-induced microphase separation (PIMS) in photoinduced 3D printing, enabling the preparation and control of nanostructured materials. The length scale of microphase-separated domains is determined by the macroCTA arm length, while nanoscale morphologies are controlled by the macroCTA architecture. By tuning the mechanical properties of these nanostructured thermosets, the scope of accessible nanostructures is expanded for various applications, including actuators and drug delivery devices.
ANGEWANDTE CHEMIE-INTERNATIONAL EDITION
(2022)
Review
Polymer Science
Nicolas Illy, Emma Mongkhoun
Summary: Thiolactones are described as latent thiols that can be opened by hydroxy or amine groups to release thiols, which can react with various functional groups. This reaction has been used to develop versatile tools for macromolecular engineering.
Article
Chemistry, Inorganic & Nuclear
Solene Delaporte, Isabel Abanades Lazaro, Javier Lopez-Cabrelles, Eleni C. Mazarakioti, Sarah Chebourou, Inigo J. Vitorica-Yrezabal, Monica Gimenez-Marques, Guillermo Minguez Espallargas
Summary: A family of robust and stable molybdenum-based metal-organic cages have been obtained using the [Mo2O2(& mu;2-O)2]2+ secondary building unit. The cages are decorated with different pyridine derivatives, which enhance the structural stability and allow for the determination of the activated cage's structure through single-crystal diffraction. The chemical robustness of the cage is demonstrated by the post-synthetic modification that enables the exchange of pyridine derivatives without breaking the cage structure.
DALTON TRANSACTIONS
(2023)
Review
Polymer Science
Ryo Tanaka, Oluwaseyi Aderemi Ajala, Yuushou Nakayama, Takeshi Shiono
Summary: In coordination polymerization chemistry, cationic transition metals with vacant sites for monomer coordination are the most active species. The polymerization behavior is strongly influenced by the steric and electronic properties around the metal center. The design of neutral metal complex precursors, especially the ligand structure, plays a crucial role in the catalyst system development. Additionally, the choice of counteranions derived from the cocatalysts can significantly impact the controlled coordination polymerization.
PROGRESS IN POLYMER SCIENCE
(2023)
Article
Chemistry, Multidisciplinary
Hao Lu, Hui Jin, Hao Huang, Wenxu Liu, Zheng Tang, Jianqi Zhang, Zhishan Bo
Summary: Three asymmetric non-fullerene acceptors incorporating a unique CBIC terminal group were synthesized, leading to improved solubility, enhanced crystallinity, and higher power conversion efficiency in organic solar cells compared to their symmetric counterparts. The combination of the CBIC terminal group with the asymmetric strategy shows promise in enhancing the performance of OSCs.
ADVANCED FUNCTIONAL MATERIALS
(2021)
Article
Chemistry, Multidisciplinary
Yang Liu, Yawei Qin, Jin-Yong Dong
Summary: The copolymerization of 1,9-decadiene/ethylene is a potential method for producing long chain-branched polyethylene using Ziegler-Natta catalysts. However, increasing the feed of 1,9-decadiene may result in gelation of the polymer.
Article
Engineering, Chemical
Kang Li, Yawei Qin, Ying Zhao, Dujin Wang, Jin-Yong Dong
Summary: The study applied omega-Alkenylmethyldichlorosilane-assisted propylene polymerization for the synthesis of long-chain-branched polypropylene (LCB-PP) in a liquid bulk polymerization process to verify its industrial adaptability. By introducing small amounts of hex-DCS, LCB-PPs with varied chain characteristics were successfully achieved, exhibiting corresponding melt properties.
INDUSTRIAL & ENGINEERING CHEMISTRY RESEARCH
(2021)
Article
Engineering, Chemical
Kang Li, Yawei Qin, Songmei Zhao, Jin-Yong Dong
Summary: Two high-degree long-chain-branched polypropylenes were prepared and melt-blended with common PP, diversifying properties and extending product range. Exceptions exist challenging composition dependency, with LCB structure's nucleation effect playing a significant role in the blends.
INDUSTRIAL & ENGINEERING CHEMISTRY RESEARCH
(2021)
Article
Engineering, Chemical
Xiuming Liu, Yawei Qin, Songmei Zhao, Jin-Yong Dong
Summary: This research demonstrates that nonolefinic organic thermoplastic polymers can act as nanoscale reinforcement for polyolefins, enhancing the elastic modulus in a certain temperature range. By grafting polystyrene nanoparticles onto multi-walled carbon nanotubes through in situ polymerization, the materials showed no coarsening during annealing in melt.
INDUSTRIAL & ENGINEERING CHEMISTRY RESEARCH
(2021)
Article
Materials Science, Multidisciplinary
Xiuming Liu, Yawei Qin, Songmei Zhao, Jin-Yong Dong
Summary: This paper introduced a in situ method for incorporating LCB structure into PE synthesized by Ziegler-Natta catalysts. By controlling the concentration of the bifunctional reagent during copolymerization, gel-free LCB-PEs with controlled amounts of LCB structure were successfully synthesized, showing improved extensional flow properties. Moreover, LCB-PEs demonstrated increased crystallization rates and crystallinities when compared to linear plain PE.
ACS APPLIED POLYMER MATERIALS
(2021)
Editorial Material
Multidisciplinary Sciences
Jinyong Dong
Summary: Polyolefins, such as polyethylene and polypropylene, are the largest-volume polymer materials in the world. China is the largest consumer market for polyolefins, but its polyolefin industry lags behind in terms of catalyst and polymerization technology, leading to a heavy reliance on imported advanced products. To address this issue, new olefin polymerization methods should be researched alongside catalyst and technology development.
CHINESE SCIENCE BULLETIN-CHINESE
(2022)
Article
Materials Science, Composites
Kai Yang, Yongruo Ren, Kangning Wu, Jianying Li, Zhenghong Jing, Zhijian Zhang, Jin-Yong Dong
Summary: This paper achieved significant increases in breakdown strength and charge injecting transition field of IPC through molten-state annealing. The multiphase structure evolution during the annealing process was investigated. The separation of EPR from the matrix and the increase in thickness of partial lamellas were found to be the influencing factors on the electrical properties. The electrohole recombination was proposed to be the main origin of high-energy electrons.
COMPOSITES SCIENCE AND TECHNOLOGY
(2022)
Article
Polymer Science
Zhijian Zhang, Kai Yang, Jianying Li, Zhenghong Jing, Yawei Qin, Jin-Yong Dong
Summary: The use of omega-alkenylmethyldichlorosilane as a long-chain-branching agent in the fully implemented impact copolymerization of propylene has shown significant improvements in IPCs. The introduction of LCB structures has led to advancements in melt properties, phase morphology, melt crystallization, and mechanical properties of the copolymer, resulting in enhanced stiffness and toughness.
Article
Polymer Science
Yuanjie Wang, Yawei Qin, Jin-Yong Dong
Summary: This paper reports a highly effective and efficient synthesis of long-chain-branched polypropylene (LCB-PP) using ACH chemistry and metallocene catalyst system. The synthesized LCB-PPs have narrow molecular weight distribution and well-defined structure. This method is simpler and more efficient compared to two other existing methods.
Article
Polymer Science
Zhijian Zhang, Kai Yang, Jianying Li, Zhenghong Jing, Yawei Qin, Jin-Yong Dong
Summary: This paper discusses the dielectric and electrical properties of novel impact polypropylene copolymers containing multifold H-shape long-chain-branching structures, and finds that these copolymers have lower dielectric constants and higher electrical breakdown strengths compared to pure polypropylene. These improvements are mainly attributed to the changes in crystalline morphology.
Article
Engineering, Electrical & Electronic
Kai Yang, Yongruo Ren, Zhenghong Jing, Zhijian Zhang, Jin-Yong Dong, Kangning Wu, Jianying Li
Summary: This article compares the breakdown strength and water tree resistance of impact polypropylene copolymer (IPC) and isotactic polypropylene (iPP) after different cooling rates. Unexpectedly, an abnormal enhancement of IPC's insulating property is discovered. The mechanism behind this enhancement is revealed to be the formation of β crystals due to rapid cooling, which increases the deep trap level and density, leading to enhanced breakdown strength and decreased water tree initiation probability. These findings highlight the significant impact of rapid cooling on the performance of IPC in cable insulation.
IEEE TRANSACTIONS ON DIELECTRICS AND ELECTRICAL INSULATION
(2023)
Article
Engineering, Chemical
Fengtao Chen, Zhijian Zhang, Yawei Qin, Jin-Yong Dong
Summary: The copolymerization of three different α-alkenyltrimethylsilanes with propylene over a Ziegler-Natta catalyst was studied. Experimental results showed that the incorporation rate of 5-hexenyltrimethylsilane was higher than that of the other two, contrary to the predicted molecular volumes. The order of comonomer incorporation rate was in line with that of α-alkenylmethyldichlorosilanes in copolymerization with long-chain-branched PP. DFT simulation revealed that the complexation abilities and insertion energy barriers varied among the three α-alkenyltrimethylsilanes, with the bulky trimethylsilane functionality playing a significant role.
MACROMOLECULAR REACTION ENGINEERING
(2023)
Article
Polymer Science
Xiu-ming Liu, Jie Du, Jin-lan Huo, Song-mei Zhao, Jin-yong Dong, Ya-wei Qin
Summary: This study successfully introduces long-chain branching structure into HDPE by a new synthesis method, preparing LCB-HDPE with significant rheological properties responses and high crystallinity. The LCB-HDPE maintains high crystallinity while having high melt strength, showing great potential for wide applications.
ACTA POLYMERICA SINICA
(2021)
Article
Polymer Science
Yang Liu, Ya-wei Qin, Li Wang, Jian-jun Yi, Jin-yong Dong
ACTA POLYMERICA SINICA
(2020)
Article
Polymer Science
Zhi-jian Zhang, Li Wang, Feng-hua Zu, Liu-ting Hong, Ya-wei Qin, Jin-yong Dong
ACTA POLYMERICA SINICA
(2020)