Article
Polymer Science
Shuqi Dong, Xiaozheng Duan, Tianhao Nan, Chengjiang Lin, Bo Liu, Dongmei Cui
Summary: In this study, a new method for preparing cyclic olefin copolymers based on dicyclopentadiene (DCPD) is reported, and the optimization of their properties by introducing styrene monomers is introduced. The results show that the incorporation of p-fluorostyrene can significantly improve the strength and breakdown voltage of the copolymers while suppressing cross-linking reactions.
Article
Materials Science, Composites
Fatemeh Morshedi, Sara Tarashi, Hossein Nazockdast
Summary: In this study, a combination of nanoparticle and elastomer techniques was used to enhance the toughness of polypropylene (PP). The sequential feeding method proved to be the most effective in preparing nanocomposites with reinforced fracture toughness. It was shown that this method allowed for selective localization of highly dispersed multi-walled carbon nanotubes (MWCNTs) in ethylene octene copolymer (EOC) particles and at the interface, resulting in intensified interfacial interactions and improved stress transfer.
POLYMER COMPOSITES
(2023)
Article
Polymer Science
Svetlana Ch. Gagieva, Vladislav A. Tuskaev, Daniele Saracheno, Anastasiia G. Buyanovskaya, Olga V. Smirnova, Tamara M. Zvukova, Alexander I. Sizov, Boris M. Bulychev
Summary: A new TADDOL-based Ti(IV) complex was synthesized and studied for its ethylene polymerization behavior, producing ultra-high molecular weight linear polyethylene and high molecular weight copolymers with alpha-olefins. The complex exhibited high activities and incorporation rates, and the copolymers obtained were analyzed to be statistical in nature. Influential reaction parameters were examined, leading to the possibility of forming both statistical and block copolymers.
Article
Polymer Science
Xiao Yang, Tao Liao, Yongfeng Men
Summary: The study investigated the stress relaxation and structural evolution of a pre-stretched random propylene-ethylene copolymer with pure gamma form. It was found that the unoriented fraction of the sample became oriented during relaxation, and the elasticity and stability of the gamma form were more attractive at smaller strains. Furthermore, a transition from gamma to alpha form was observed during the relaxation process.
Article
Chemistry, Multidisciplinary
Meaghan A. Bruening, Shuoyan Xiong, Theodor Agapie
Summary: Linear a-olefins are efficiently prepared from ethylene in the Shell higher olefin process (SHOP), while a general process for the preparation of a range of α,β-dienes is lacking. Here, we report a two-step method that generates industrially relevant α,β-dienes. We demonstrate the generation of a distribution of α,β-dienes in the C10-C20 range through the ethenolysis of copolymers obtained by the copolymerization of ethylene and butadiene.
ACS SUSTAINABLE CHEMISTRY & ENGINEERING
(2023)
Article
Materials Science, Characterization & Testing
Camille Blivet, Jean-Francois Larche, Yael Israeli, Pierre-Olivier Bussiere, Jean-Luc Gardette
Summary: The study investigated the thermo-oxidation of cross-linked polyethylene (XLPE) and cross-linked ethylene propylene rubber (XLEPR) used as electrical insulators in cable systems. Characterisation of the aged materials and calculation of activation energies were conducted, showing correlations between oxidation products, crystallinity changes, gel content variations, and mechanical property reductions in both materials. Despite a diffusion-limited oxidation (DLO) effect observed in the 1 mm thick samples, the results were consistent.
Article
Polymer Science
Svetlana Ch Gagieva, Kasim F. Magomedov, Vladislav A. Tuskaev, Vyacheslav S. Bogdanov, Dmitrii A. Kurmaev, Evgenii K. Golubev, Gleb L. Denisov, Galina G. Nikiforova, Maria D. Evseeva, Daniele Saracheno, Mikhail Buzin, Pavel B. Dzhevakov, Viktor Privalov, Boris M. Bulychev
Summary: The effect of different activators on the catalytic activity and properties of synthesized complexes were studied. Ti-Fi complexes were found to effectively catalyze the polymerization and copolymerization reactions, while Zr-FI complexes showed low activity with the same activators.
Article
Engineering, Environmental
Bruna Bonato Turriziani, Ronierik Pioli Vieira, Luis Marangoni Jr, Rosa Maria Vercelino Alves
Summary: Mechanical recycling is an important method to reduce the use of fossil resources in plastic production. This study evaluated the recyclability of multilayer films used in meat product packaging and found that the use of a compatibilizer can improve the recycling efficiency. The results provide valuable insights for the recycling of multilayer packaging materials.
JOURNAL OF POLYMERS AND THE ENVIRONMENT
(2023)
Article
Polymer Science
Jeremy L. Swartz, Daylan T. Sheppard, Greg Haugstad, William R. Dichtel
Summary: This study demonstrates the blending of rigid polyester PU and soft polyether PU using twin-screw extrusion to produce materials with tunable mechanical properties. The extruded materials exhibit similar mechanical and thermal properties to freshly prepared blends, and higher-value mechanical properties compared to samples reprocessed via compression molding. Additionally, the extruded materials show less phase separation in morphology compared to compression-molded blends, and the mechanical properties were tunable through consecutive reprocessing cycles.
Article
Polymer Science
Zongke He, Hui Niu, Liying Liu, Shiqi Xie, Zhe Hua, Yang Li
Summary: A new strategy for preparing elastomeric vitrimer based on EPR was proposed in this study, using a dynamic imine bond-based cross-linking network. The cross-linking density and mechanical properties of the material could be adjusted by varying the aldehyde group content or the aldehyde/TREA ratio. The activation energy of the cross-linking reaction was calculated to be 57.2 kJ mol(-1), providing the cross-linked network with good plasticity and recyclability.
Article
Polymer Science
Xiaoxu Li, Lidong Qin, Qaiser Mahmood, Zhixin Yu, Song Zou, Yizhou Wang, Tongling Liang, Wen-Hua Sun
Summary: Steric effects have a significant impact on the catalytic performance of alpha-diimine nickel precatalyst for ethylene polymerization. In this study, a series of new unsymmetrical 2,3-diiminobutane nickel complexes with sterically encumbered groups were synthesized and used as pre-catalysts. These complexes exhibited remarkable catalytic activities and produced highly branched polyethylene with high molecular weights and narrow molecular weight distributions when used with optimal co-catalysts. The Ni3 complex showed high thermal stability and maintained high catalytic activity even at elevated temperatures. The branching content and mechanical properties of polyethylene were also influenced by temperature.
EUROPEAN POLYMER JOURNAL
(2023)
Article
Polymer Science
Kangkang Li, Lei Cui, Yixin Zhang, Zhongbao Jian
Summary: The direct copolymerization of olefins with polar monomers to produce functionalized polyolefins, particularly those with amide functions, has been a challenge. However, by utilizing compounds with high ring strain and an amide moiety in ethylene copolymerization, high amide incorporation, molecular weights, and catalytic activities can be achieved. The resulting amide-functionalized polyethylenes can undergo facile post-transformations to produce polyethylenes with diverse functionalities, such as hydrogen bond-containing, difunctionalized, and water-soluble ammonium-functionalized polyethylenes, which exhibit antibacterial properties.
Article
Chemistry, Multidisciplinary
Clement G. Collins Rice, Louis J. Morris, Jean-Charles Buffet, Zoe R. Turner, Dermot O'Hare
Summary: Using a highly active permethylindenyl-phenoxy (PHENI*) titanium catalyst, high to ultra-high molecular weight ethylene-linear-alpha-olefin copolymers are efficiently synthesized under mild conditions. The system allows for the production of copolymers with a wide range of compositions and material properties through predictive alteration of reaction conditions, offering numerous possibilities for applications.
Article
Chemistry, Physical
Alvin Jonathan, Emily G. Tomashek, Michael P. Lanci, James A. Dumesic, George W. Huber
Summary: Ethylene oligomerization over carbon-supported cobalt catalysts at 200 degrees C selectively produces linear olefins and linear alpha olefins, with increasing the catalyst pretreatment temperature enhancing catalytic activity. However, cobalt metal supported on carbon deactivates during the reaction, likely due to higher rate of polyethylene formation, and the product distribution follows a Schulz-Flory distribution. The reaction is first order with respect to ethylene partial pressure, suggesting a mechanism involving the reaction of ethylene with adsorbed olefins on a highly covered surface.
JOURNAL OF CATALYSIS
(2021)
Article
Polymer Science
Guifa Xu, Yangke Xiao, Wen-Jun Wang, Bo-Geng Li, Pingwei Liu
Summary: This study blends CPOEs with PE-Ms to investigate the structure-activity relationship of CPOEs. The results show that the effect of LCBes on material performance is related to their chain conformation and the number of entanglements. This research provides insights into macromolecular engineering in polymer and can facilitate the development of higher-performance CPOEs or other grafted polymers.
Article
Mechanics
Florian J. Stadler, Shuming Cui, Saud Hashmi, Stephan Handschuh-Wang, Wenqiang Li, Shichang Wang, Zhi-Chao Yan, Guangming Zhu
Summary: The 3iTT protocol and multiple interval thixotropic test protocol (miTT) are used to monitor changes in material behavior, with G' and G showing sensitivity to shear rate variations. Pickering emulsions with graphene oxide exhibit reversible changes in G' and G.
Article
Engineering, Chemical
Shweta Sharma, Gaurav Sharma, Amit Kumar, Pooja Dhiman, Tahani Saad AlGarni, Mu Naushad, Zeid A. ALOthman, Florian J. Stadler
Summary: The present study successfully designed a novel porous Zn/Fe LDH adsorbent using a combination of co-precipitation, hydrothermal, and thermal treatment methods. Intercalating H2O2 into LDH followed by thermal treatment created pores in the LDH layers, leading to increased surface area. The synthesized adsorbent showed a high adsorption capacity for the antibiotic ciprofloxacin, following Freundlich isotherm model and pseudo-second-order kinetic model, with C pi-metal interactions, hydrogen bonding, and electrostatic interactions playing major roles.
SEPARATION AND PURIFICATION TECHNOLOGY
(2022)
Article
Materials Science, Composites
Maryam Jouyandeh, Mohammad Reza Ganjali, Mehdi Mehrpooya, Otman Abida, Karam Jabbour, Navid Rabiee, Sajjad Habibzadeh, Amin Hamed Mashahdzadeh, Alberto Garcia-Penas, Florian J. Stadler, Mohammad Reza Saeb
Summary: In this study, samarium-doped Fe3O4 nanoparticles were synthesized and uniformly dispersed in epoxy resin to enhance the curability of the epoxy/amine system. The results showed that the presence of samarium in the Fe3O4 crystal structure catalyzed the cross-linking reaction between epoxy and amine, leading to improved curing of the epoxy system.
JOURNAL OF COMPOSITES SCIENCE
(2022)
Review
Materials Science, Biomaterials
Payam Zarrintaj, Mohammad Reza Saeb, Florian J. Stadler, Mohsen Khodadadi Yazdi, Mojtaba Nasiri Nezhad, Shabnam Mohebbi, Farzad Seidi, Mohammad Reza Ganjali, Masoud Mozafari
Summary: Organ-on-a-chip (OOC) technology, utilizing miniaturized 3D organ models and microfluidics, has the potential to revolutionize cell biology studies, drug development processes, and cancer diagnosis/treatment by closely mimicking the structure and function of human organs, thus improving efficiency and reducing costs.
Article
Biochemistry & Molecular Biology
Mehdihasan I. Shekh, Guangming Zhu, Wei Xiong, Weiling Wu, Florian J. Stadler, Dijit Patel, Chengtian Zhu
Summary: By forming multi-dynamic interactions and strong covalent interactions, stretchable, self-recoverable, conductive, and tough nanocomposite hydrogels (NCHGs) were successfully synthesized. These NCHGs exhibited high mechanical strength, toughness, stretchability, elasticity, and conductivity. The presence of Fe(III) ions and conducting fillers endowed excellent repeatability and stability in resistance change, along with ultra-broad sensitivity and minimal resistance change.
INTERNATIONAL JOURNAL OF BIOLOGICAL MACROMOLECULES
(2023)
Article
Environmental Sciences
Saud Hashmi, Rafiq Ahmed, Adeel ur Rehman, Alberto Garcia-Penas, Awan Zahoor, Firoz Khan, Mohammad Vatankhah-Varnosfaderani, Thamraa Alshahrani, Florian J. Stadler
Summary: Hybrid hydrogels based on n-isopropylacrylamide, zwitterionic comonomer, and graphene oxide were synthesized to study their physical and mechanical properties. The compositional variation greatly affected the swelling characteristics of the hybrid hydrogels, while the mechanical properties such as elongation and compression were less influenced. Rheometric swelling measurements showed a strong covalent network, which increased with increasing content of zwitterions and GO. Kinetics of swelling followed Fickian dynamics and 2-step swelling pattern was observed for zwitterion-containing gels. The study also observed differences in swelling mechanism between hydrogels with 2D GO nano-fillers and 1D CNT nano-fillers, and differences in mechanical properties between elongation and compression modes.
Review
Energy & Fuels
Amit Kumar, Atul Khosla, Sunil Kumar Sharma, Pooja Dhiman, Gaurav Sharma, Lalitha Gnanasekaran, Mu. Naushad, Florian J. Stadler
Summary: This article provides a review on the transition from Z-scheme to S-scheme photocatalytic materials, discussing different types of heterojunctions and charge transfer mechanisms. It also presents the synthetic routes to S-scheme heterojunctions and highlights their current applications in pollutant degradation, hydrogen production, and CO2 conversion. The commercialization status and existing readiness and bottlenecks of S-scheme heterojunctions are also discussed.
Article
Materials Science, Multidisciplinary
Stephan Handschuh-Wang, Tiansheng Gan, Muhammad Rauf, Weifa Yang, Florian J. Stadler, Xuechang Zhou
Summary: This research conducted an experimental study to show the difference between the commercial product Galinstan (R) and the eutectic alloy of Ga, In, and Sn (EGaInSn). The results demonstrate that the two alloys have significantly different melting temperatures and surface tensions, which can be attributed to additives in Galinstan (R). It is recommended that researchers use EGaInSn instead of Galinstan to avoid confusion.
Article
Chemistry, Multidisciplinary
Jun-Feng Liu, Zhan-Yu Wu, Florian J. Stadler, Yan-Fei Huang
Summary: The incorporation of ionic liquids (ILs) in solid-state polymer electrolytes (iono-SPEs) greatly enhances Li+ transport in polymer phases. By using a poly (vinylidene fluoride-trifluoroethylene-chlorotrifluoroethylene) (PTC) as the framework of ILs, non-uniform Li+ transport among different phases is reduced. This is achieved through weaker adsorption energy of IL cations on PTC chains compared to PVDF and the higher dielectric constant of PTC facilitating the dissociation of Li-anions clusters. The LiFePO4/PTC iono-SPE/Li cells show stable cycling performance with high capacity retention after 1000 cycles at 1 C and 25 degrees C. This work provides a novel approach to induce uniform Li+ flux in iono-SPEs through polarity and dielectric design of the polymer matrix.
ANGEWANDTE CHEMIE-INTERNATIONAL EDITION
(2023)
Article
Chemistry, Multidisciplinary
Stephan Handschuh-Wang, Muhammad Rauf, Tao Wang, Tiansheng Gan, Florian J. Stadler
Summary: This article introduces liquid metals as materials that can visually demonstrate extreme modulation of interfacial tension and possess a high degree of sustainability. Therefore, we recommend the use of liquid metals in chemical education in schools and universities.
CHEMIE IN UNSERER ZEIT
(2023)
Article
Biochemistry & Molecular Biology
Shi-Chang Wang, Shu-Tong Du, Saud Hashmi, Shu-Ming Cui, Ling Li, Stephan Handschuh-Wang, Xuechang Zhou, Florian J. Stadler
Summary: This study investigates the rheological properties of dual-network hydrogels based on acrylamide and sodium alginate under large deformations. The concentration of calcium ions affects the nonlinear behavior, and all gel samples exhibit strain hardening, shear thickening, and shear densification. The paper focuses on the systematic variation of the alginate concentration and the Ca2+ concentration in order to understand their impact on the hydrogel's properties.
Article
Polymer Science
Gaurav Sharma, Alberto Garcia-Penas, Yaksha Verma, Amit Kumar, Pooja Dhiman, Florian J. Stadler
Summary: This study successfully designed shape-oriented hydrogel nanospheres using a facile ultrasonication-supported crosslinked copolymerization technique. The chitosan-cl-poly(MMA) hydrogel nanospheres were characterized and found to have optimal rhodamine B dye adsorption capacity at pH 5. Nanohydrogel concentration also affected the adsorption capacity and percentage.
Article
Materials Science, Composites
Ge-Ge Zheng, Xin Lin, Zhen-Xing Wen, Yu-Hao Ding, Rui-Hui Yun, Gaurav Sharma, Amit Kumar, Florian J. Stadler
Summary: Photocatalytic degradation is crucial for wastewater treatment, and efficient degradation relies on photocatalytic systems with excellent light absorption, carrier separation efficiency, and surface-active sites. S-type heterojunctions, especially the BiFeO3/ZnIn2S4 heterojunction, show remarkable potential for efficient degradation. This study focuses on enhancing the photocatalytic degradation performance by introducing sulfur vacancy defects and morphology modifications to ternary indium metal sulfide and bismuth ferrite nanofibers. The optimized 30% BiFeO3/ZnIn2S4 heterojunction exhibits superior photocatalytic performance, with high sulfur vacancy concentration and enhanced electron transport efficiency. It achieved a remarkable 99% degradation of Evans blue within 45 minutes and a significant 68% degradation of ciprofloxacin within 90 minutes. These results provide a feasible approach for developing photocatalysts to address water pollution issues under practical conditions.
JOURNAL OF COMPOSITES SCIENCE
(2023)
Article
Education, Scientific Disciplines
Stephan Handschuh-Wang, Florian J. Stadler
Summary: New experiments on redox reactions at the liquid metal (Galinstan) interface are presented in this article. These experiments link redox reactions with standard potentials and metallurgy. The experiments offer a simple setup, easy handling without hazardous chemicals, a quick visual and memorable access to redox reactions, as well as the ability to reclaim and reuse the liquid metal (Galinstan).
Article
Chemistry, Physical
Shu-Ming Cui, Saud Hashmi, Wen-Qiang Li, Stephan Handschuh-Wang, Cheng-Tian Zhu, Shi-Chang Wang, Yan-Fei Huang, Guang-Ming Zhu, Florian J. Stadler
Summary: This paper investigates Pickering emulgels stabilized by graphene oxide (GO) with didodecyldimethylammonium bromide (DDAB) as an auxiliary surfactant and liquid paraffin as the oil phase, which are proved to be excellent 3D printable ink. The structure of these emulgels is elucidated by microscopy, broadband dielectric spectroscopy and rheology analysis. It is found that the increase of DDAB surfactant and GO-contents results in an increase of modulus and viscosity, a reduction of nonlinear regime limits, and a complex variation of normal forces.