Article
Chemistry, Multidisciplinary
Cyril Micheau, Yuki Ueda, Ryuhei Motokawa, Pierre Bauduin, Luc Girard, Olivier Diat
Summary: Understanding clay flotation mechanisms is important due to the increasing environmental contamination of soil and groundwater. Clays can be used to extract metals but also act as defoamers. The relationship between foam generation and molecular interactions between clays and surfactants is still unclear.
Article
Chemistry, Multidisciplinary
Yiyang Xiao, Yichen Sun, Xin Wang, Yan Xu, Jianbo Wang
Summary: In this study, we report a method for synthesizing alternating copolymers of styrene and substituted styrenes through radical alternating copolymerization and protodeboronation. This synthetic strategy is effective for various substituted styrene co-monomers, and the Bpin group plays a crucial role in achieving alternating polymerization. The method shows great potential for applications, and is also compatible with RAFT living polymerization.
ANGEWANDTE CHEMIE-INTERNATIONAL EDITION
(2023)
Article
Engineering, Chemical
Pranabesh Sahu, Jae Young Ko, Jin Uk Ha, Jeong Seok Oh
Summary: Based on the high-temperature persulfate emulsion process, biobased elastomers were successfully synthesized using β-farnesene and styrene, and applied in tire applications. The copolymer showed desirable molecular weight, chemical structure, glass-transition temperature, and thermal stability. In addition, the incorporation of carbon black improved the mechanical properties and wet skid resistance of the rubber vulcanizates. This study offers an efficient approach for developing sustainable rubbers on an industrial scale for multifaceted applications.
INDUSTRIAL & ENGINEERING CHEMISTRY RESEARCH
(2023)
Article
Polymer Science
Christopher Hill, Wasiu Abdullahi, Robert Dalgliesh, Martin Crossman, Peter Charles Griffiths
Summary: The study explores the phase space of oppositely charged polymer-surfactant complexes through interactions between charge-modified cationic hydroxyethyl cellulose polymers and sodium dodecylsulfate surfactant. Significant interactions were observed between the charge-modified polymers and SDS, leading to an increase in the size of the formed complexes with increasing Z.
Article
Polymer Science
Xiaochun Mu, Yang Li
Summary: The syndiospecific coordination polymerization of carbazole-substituted styrene derivatives using a rare-earth metal catalyst showed high activity and excellent syndioselectivity. By adjusting the feed amount, the insertion rate of carbazole-substituted monomers could be simply adjusted, resulting in copolymers with gradient sequence distributions confirmed by analysis and kinetics study.
Article
Materials Science, Multidisciplinary
Le N. M. Dinh, Bich Ngoc Tran, Vipul Agarwal, Per B. Zetterlund
Summary: This study explores the effects of different preparation methods on polymer nanocomposite materials, and finds that the stability and physical properties of the nanocomposite films are greatly influenced by the preparation method and compositional details.
ACS APPLIED POLYMER MATERIALS
(2022)
Article
Engineering, Chemical
Pranabesh Sahu, Jae Young Ko, Jin Uk Ha, Jeong Seok Oh
Summary: In response to the demand for sustainability in the rubber industry, researchers have developed a method to synthesize biobased elastomers as a replacement for petroleum-based polymers. By using β-farnesene and styrene, they successfully produced elastomers with high molecular weight and desirable chemical structure, demonstrating good thermal stability and mechanical properties. This work provides an efficient approach for developing sustainable rubbers on an industrial scale using emulsion polymerization.
INDUSTRIAL & ENGINEERING CHEMISTRY RESEARCH
(2023)
Article
Engineering, Chemical
Joe Glasing, Jaime C. Cazotti, Alexander T. Fritz, Lilian S. Szych, Djalal Fakim, Niels M. B. Smeets, Michael F. Cunningham
Summary: In this study, Pickering miniemulsion polymerizations of styrene were conducted using starch nanoparticles modified with OSA and DSA. Low interfacial tension and a range of particle sizes were observed, with secondary nucleation observed when AIBN was used as an initiator. Modified SNP as PE resulted in relatively uniform latexes at low conversions.
CANADIAN JOURNAL OF CHEMICAL ENGINEERING
(2022)
Article
Polymer Science
Heather S. C. Hamilton, Cornelia Meissner, Todd Emrick, Laura C. Bradley
Summary: A one-step dispersion copolymerization technique is used to fabricate biphasic particles with complex morphology. The study shows that the particle morphology can be transformed by washing the particles with water. The copolymerization process can be controlled by the solubility profile of the monomers, resulting in phase-separated particle morphology.
MACROMOLECULAR RAPID COMMUNICATIONS
(2023)
Article
Chemistry, Inorganic & Nuclear
Zhongxian Huang, Aiyuan Li, Jue Chen, Yunjie Luo
Summary: The development of efficient catalysts for copolymerization of nonpolar and polar monomers is a challenging task. The one-pot reaction of anhydrous LnCl3 with pyridyl-methylene-functionalized octamethylfluorenyl lithium OctFlu-CH2PyLi, followed by alkylation, yielded fluorenyl-ligated rare-earth metal bis(alkyl) complexes. These complexes exhibited high syndiotacticity in the polymerization of styrene and para-methoxystyrene, as well as in the syndiospecific copolymerization, with tunable copolymer compositions.
INORGANIC CHEMISTRY
(2023)
Article
Polymer Science
Weijia Mao, Jit Sarkar, Bo Peng, Atsushi Goto
Summary: The reversible complexation mediated polymerization (RCMP) has been successfully utilized in aqueous emulsion polymerization, producing stable polymer particles with high solid contents. This method is versatile, with attractive features for polymer materials applications and industrial use.
Article
Chemistry, Multidisciplinary
Veronika Bronskaya, Galiya Manuyko, Denis Balzamov, Tatyana Ignashina, Dmitriy Bashkirov, Olga Kharitonova, Maria Kondrateva, Guzel Khabibullina
Summary: The article discusses the technology and mathematical models for preparing SSBR rubber, focusing on improving heat generation and reducing rolling resistance. It explores the synthesis of polymers to achieve specified rubber physical and mechanical properties.
ARABIAN JOURNAL OF CHEMISTRY
(2023)
Article
Chemistry, Multidisciplinary
Christoph Hahn, Moritz Rauschenbach, Holger Frey
Summary: We report the first anionic polymerization of 1-vinylcyclohexene (VCH). The obtained polymers have well-controlled molecular weights and narrow molecular weight distributions. The microstructure of the resulting P(VCH) can be altered by the addition of a modifier (THF), resulting in increased 3,4-microstructure and elevated glass-transition temperature.
ANGEWANDTE CHEMIE-INTERNATIONAL EDITION
(2023)
Article
Chemistry, Physical
Johan Larsson, Adrian Sanchez-Fernandez, Anna E. Leung, Ralf Schweins, Baohu Wu, Tommy Nylander, Stefan Ulvenlund, Marie Wahlgren
Summary: The anomeric configuration of n-hexadecyl-D-maltopyranoside affects the micelle morphology and rheological behavior, with beta-C(16)G(2) forming worm-like micelles and alpha-C(16)G(2) forming cylindrical micelles. Mixing these surfactants can lead to systems with intermediate rheological properties. The results demonstrate the potential for tailored development of sustainable excipients through geometric variations while maintaining the chemical composition of the system.
JOURNAL OF COLLOID AND INTERFACE SCIENCE
(2021)
Article
Chemistry, Inorganic & Nuclear
Suting Xu, Yanchen Huo, Xiang Hu, Fei Wang, Li Pan, Xiaochao Shi
Summary: In this study, rare-earth metal complexes bearing tetrahydrofluorenyl ligands were synthesized and characterized. These complexes showed excellent catalytic activity for the polymerization of styrene and butadiene, resulting in diblock copolymers with highly syndiotactic polystyrene block and a 1,4-specific PBD block. The study also revealed the significant difference in reactivity ratios between butadiene and styrene, supporting the block structure of the copolymers. Morphology and mechanical properties of the selected diblock copolymer were investigated.
INORGANIC CHEMISTRY
(2023)
Article
Chemistry, Physical
Yusuke Sasaki, Naho Konishi, Michinari Kohri, Tatsuo Taniguchi, Keiki Kishikawa, Takashi Karatsu
Summary: Luminescent core-shell polymer particles carrying amino groups were synthesized for covalent immobilization of enzymes in immunoassays. By controlling the density of grafted chains, the dispersion stability of the particles and the suppression of nonspecific adsorption were regulated successfully.
COLLOID AND POLYMER SCIENCE
(2022)
Article
Materials Science, Ceramics
Ryuhei Motokawa, Koji Kaneko, Yojiro Oba, Takayuki Nagai, Yoshihiro Okamoto, Taishi Kobayashi, Takayuki Kumada, William T. Heller
Summary: This study investigates the impact of additives on the nanoscopic structure of borosilicate glasses. The results show that Na2O decreases the glass melting point and increases the spacing of SiO2 and B2O3-rich domains, while CaO/ZnO additives induce void structures in the glass, which can be suppressed by Li2O.
JOURNAL OF NON-CRYSTALLINE SOLIDS
(2022)
Article
Materials Science, Multidisciplinary
Masaya Masuda, Takuya Kobayashi, Michinari Kohri, Keiki Kishikawa
Summary: A new thermo-optical switching material that demonstrates birefringence inversion without changing columnar alignment by controlling temperature has been synthesized in the field of columnar liquid crystals. The mechanism involves urea molecules forming one-dimensional linear molecular aggregates, which exhibit rectangular and hexagonal columnar phases. The perfect disappearance of texture during the transition between two columnar phases is observed under polarized light optical microscopy.
Article
Chemistry, Multidisciplinary
Kazuhiro Akutsu-Suyama, Norifumi L. Yamada, Yuki Ueda, Ryuhei Motokawa, Hirokazu Narita
Summary: Knowledge of interfacial structures in liquid-liquid systems is crucial for enhancing two-phase biological and chemical reactions. A new sample cell for neutron reflectometry (NR) was developed to observe the layer structure around the interface. The adsorption behavior of SDS on the toluene-D2O interface was investigated under the new experimental conditions.
APPLIED SCIENCES-BASEL
(2022)
Article
Chemistry, Multidisciplinary
Yuka Isozaki, Seiya Higashiharaguchi, Naoya Kaneko, Shun Yamazak, Tatsuo Taniguchi, Takashi Karatsu, Yuki Ueda, Ryuhei Motokawa
Summary: Polymer photonic crystals (PPCs) with selective reflection of visible light were successfully prepared using in situ microphase separation induced by reversible addition-fragmentation chain transfer (RAFT) polymerization. The addition of homopolymer facilitated the formation of PPCs with long-wavelength structural colors while maintaining the morphology of the lamellar microdomains.
Article
Chemistry, Multidisciplinary
Cyril Micheau, Yuki Ueda, Kazuhiro Akutsu-Suyama, Damien Bourgeois, Ryuhei Motokawa
Summary: Malonamide derivatives were deuterated using Pd/C and Rh/C catalysts in a D2O/2-propanol mixture, replacing H-1 atoms with controllable deuteration rate. The extraction behavior of metal ions by the deuterated malonamides remained unchanged. Deuterated malonamides are useful tools for solvent extraction research and structural analysis of organic phases.
SOLVENT EXTRACTION AND ION EXCHANGE
(2023)
Article
Engineering, Environmental
Takumi Saito, Ryuhei Motokawa, Takahiro Ohkubo, Daisuke Miura, Takayuki Kumada
Summary: Aggregation of humic acids (HAs) was investigated through small-angle neutron and X-ray scattering techniques. The results showed that HA particles formed aggregates exceeding the sub-micrometer length scale. It was observed that PAHA aggregates consisted of poorly hydrated cores and well-hydrated proton-rich shells, while HHA formed homogeneous aggregates. This study provides important insights into the behavior and role of HAs in aqueous environments.
ENVIRONMENTAL SCIENCE & TECHNOLOGY
(2023)
Article
Polymer Science
Tomonao Naruhashi, Daisuke Aoki, Tatsuo Taniguchi, Takashi Karatsu
Summary: The mechanical stability and insulating reliability of polymeric layers on nickel-plated particles for anisotropic conductive films were measured using a microcompression test. The polymeric layers were formed through heterocoagulation and thermal fusion. The larger the shell particles and the higher the coverage of heterocoagulates, the greater the displacement, reaching a maximum of 0.72 μm.
JOURNAL OF APPLIED POLYMER SCIENCE
(2023)
Article
Chemistry, Physical
Daniel Massey, Christopher D. Williams, Junju Mu, Andrew J. Masters, Ryuhei Motokawa, Noboru Aoyagi, Yuki Ueda, Mark R. Antonio
Summary: By using an improved force field to conduct molecular dynamics simulations, we have discovered that metallic complexes in organic solvents form complex fluids with intricate structures, mainly consisting of cis isomers. With increasing metal concentration, more clustering occurs and the chemical equilibrium shifts toward the cis isomer. These isomeric effects may play a role in liquid-liquid extraction and can improve flow sheet modeling.
JOURNAL OF PHYSICAL CHEMISTRY B
(2023)
Article
Multidisciplinary Sciences
Y. Oba, R. Motokawa, K. Kaneko, T. Nagai, Y. Tsuchikawa, T. Shinohara, J. D. Parker, Y. Okamoto
Summary: We conducted a preliminary study on neutron resonance absorption imaging to investigate the spatial distribution of constituent elements in borosilicate glasses containing simulated high-level radioactive waste. The resonance absorptions of Rh, Pd, Na, Gd, Cs, and Sm were observed in the neutron transmission spectra of the glass samples. The spatial distributions of these elements were obtained from the neutron transmission images at the resonance energies. The results indicate that neutron resonance absorption imaging shows promise as a tool for characterizing borosilicate glasses and investigating the vitrification mechanism of high-level radioactive waste.
SCIENTIFIC REPORTS
(2023)
Article
Chemistry, Physical
Takayuki Kumada, Hiroshi Nakagawa, Daisuke Miura, Yurina Sekine, Ryuhei Motokawa, Kosuke Hiroi, Yasuhiro Inamura, Takayuki Oku, Kazuki Ohishi, Toshiaki Morikawa, Yukihiko Kawamura, Kiyoshi Kawai
Summary: Spin-contrast-variation (SCV) small-angle neutron scattering (SANS) is a technique used to determine the nanostructure of composite materials by analyzing the scattering of polarized neutrons. In this study, SCV-SANS was used to analyze the structure of nanoice crystals in rapidly frozen sugar solutions. The results showed that the nanoice crystals had a planar structure with a radius larger than several tens of nanometers and a thickness of 2.5±0.5 nm. Furthermore, the glucose molecules were found to preferentially bind to a specific face of the nanoice crystals, inhibiting growth perpendicular to that face.
JOURNAL OF PHYSICAL CHEMISTRY LETTERS
(2023)
Article
Chemistry, Multidisciplinary
Cyril Micheau, Yuki Ueda, Ryuhei Motokawa, Pierre Bauduin, Luc Girard, Olivier Diat
Summary: Understanding clay flotation mechanisms is important due to the increasing environmental contamination of soil and groundwater. Clays can be used to extract metals but also act as defoamers. The relationship between foam generation and molecular interactions between clays and surfactants is still unclear.
Article
Polymer Science
Motoki Shibata, Yohei Nakanishi, Jun Abe, Hiroshi Arima-Osonoi, Hiroki Iwase, Mitsuhiro Shibayama, Ryuhei Motokawa, Takayuki Kumada, Shin-ichi Takata, Katsuhiro Yamamoto, Mikihito Takenaka, Tsukasa Miyazaki
Summary: Microplastic pollution is causing degradation of marine ecosystems. Decomposition of plastic using near critical or supercritical water is a promising method to remove microplastics. This study investigated the decomposition processes of polystyrene particles in deuterated water under near critical or supercritical conditions and observed the changes in material structure.
Article
Chemistry, Physical
Hayato Tsuji, Masaki Nakahata, Mafumi Hishida, Hideki Seto, Ryuhei Motokawa, Takeru Inoue, Yasunobu Egawa
Summary: This study investigates the aggregation behavior of hydrophobic solutes in water-THF solution and the role of THF. A model is proposed based on experimental results, suggesting that hydrophobic solutes are molecularly dispersed in the low-water-content region and form mesoscopic particles upon increasing the water fraction.
JOURNAL OF PHYSICAL CHEMISTRY LETTERS
(2023)
Article
Biochemical Research Methods
Shota Mashiyama, Runa Hemmi, Takeru Sato, Atsuya Kato, Tatsuo Taniguchi, Masumi Yamada
Summary: The low productivity of microdroplets has limited the applications of droplet microfluidics. In this study, a microfluidic system employing inverse colloidal crystals (ICCs) with densely formed micropores was developed to significantly increase the throughput of microdroplet generation. By adjusting flow conditions, fluid properties, and micropore size, droplet size can be controlled, and biopolymer particles can be produced.
