Article
Engineering, Environmental
Ewa Glowinska, Wojciech Wolak, Janusz Datta
Summary: The research focused on the synthesis and properties examination of partially bio-based thermoplastic polyurethane elastomers. By using different diisocyanate mixtures, the study analyzed the chemical structure, thermal, thermomechanical, mechanical, and physicochemical properties of the materials.
JOURNAL OF POLYMERS AND THE ENVIRONMENT
(2021)
Article
Polymer Science
Fanhao Zeng, Jingyi Ning, Yunyun Yang, Chong Tian, Lei Huang, Fuqi Zhao, Qiang Liu, Meiling Cui, Jiahao Lv, Yunfeng Jiang, Xufu Cai, Weibo Kong
Summary: This study proposes a strategy to fabricate photohealable polyurethanes (PHPUs) by molecule design, which exhibit superior mechanical robustness, high healing ratio, and shape programming under infrared control.
Article
Materials Science, Multidisciplinary
Wei Zhou, Yu-Chung Chang, Tuan Liu, Ming-en Fei, Cheng Hao, Baoming Zhao, Meng Zhang, Jinwen Zhang
Summary: This study reports a catalyst-free polyurethane vitrimer (PUV) prepared from a bio-based feedstock, which possesses abundant carbamate linkages and dense hydrogen bonds, resulting in impressive mechanical properties. Moreover, the PUV exhibits a thermally induced intrinsic dynamic carbamate interchange reaction (DCIR) without the need of a catalyst, making it fully repairable and recyclable. The potential application of PUV in high-performance film is demonstrated using a fluorescent indicator film.
ACS APPLIED POLYMER MATERIALS
(2023)
Article
Polymer Science
Bailin Shan, Yan Wu, Xuejuan Cao, Boming Tang, Kuiling Wei
Summary: This study successfully synthesized a hydrophobic chain extender containing disulfide bonds (CY-OA) and used it to enhance the practical application capability of self-healing waterborne polyurethanes. The synthesized polymers exhibited good hydrophobicity, water resistance, and self-healing efficiency.
Article
Polymer Science
Aiza Shoukat, Mohammad Zubair, Jalal Uddin, Ajmal Khan, Ahmed Al-Harrasi
Summary: This article introduces the preparation and properties of non-porous rubbery polyurethane membranes. By varying the molecular weight of polycaprolactone, the flexibility and gas transport performance of the membranes were improved. Higher molecular weight PUMs exhibit better mechanical properties and gas transport performance. The study also found that increasing temperature, pressure, and transient gaps can enhance permeation flux and selectivity.
Article
Polymer Science
Jiyeon Oh, Young Kwang Kim, Sung-Ho Hwang, Hyun-Chul Kim, Jae-Hun Jung, Cho-Hyun Jeon, Sang Kyoo Lim
Summary: The study produced green thermoplastic polyurethanes (TPUs) that were either partially or fully bio-based using a one-shot polymerization process. Different methods were used to characterize the TPUs, which had a high molecular weight. Increasing the content of bio-aliphatic pentamethylene diisocyanate (PDI) improved the bio-based carbon content and pyrolysis onset temperature. Increasing the content of petro-aromatic methylene diphenyl diisocyanate (MDI) resulted in higher complex viscosity, tensile strength, and strain. The research demonstrates the feasibility of utilizing bio-based TPUs as a substitute for conventional MDI, with potential industrial applications.
JOURNAL OF APPLIED POLYMER SCIENCE
(2023)
Article
Chemistry, Multidisciplinary
Peixuan Wu, Haiyang Cheng, Xinchao Wang, Ruhui Shi, Chao Zhang, Masahiko Arai, Fengyu Zhao
Summary: The synthesis of a new environmentally friendly, self-healing, and recyclable polymeric material PUUa-DA, using CO2 and bio-based furfuryl amine, demonstrates high thermal stability and mechanical properties. The incorporation of reversible hydrogen bonds and heat-responsive Diels-Alder bonds enables 94% recovery of tensile strength upon heating, making it a potential functional material for various practical applications.
Article
Polymer Science
Xu Chen, Hui-Feng Zhang, Kai-Juan Li, Shuangquan Liao, Ming-Chao Luo
Summary: Inspired by self-healing process, a structure recovery strategy is proposed for recovering the damaged structure induced by thermo-oxidative process, which improves the elastomers' thermo-oxidative resistance. The high reactivity between 1,3-diisopropenylbenzene and free radicals achieves high recovery efficiency; changes in topology structure during recovery process enhance mechanical properties significantly. This work paves the way for developing elastomers with superior thermo-oxidative resistance and promotes the practical application of self-healing theoretical research.
MACROMOLECULAR RAPID COMMUNICATIONS
(2021)
Article
Polymer Science
Santiago Maldonado-Magnere, Mehrdad Yazdani-Pedram, Hector Aguilar-Bolados, Raul Quijada
Summary: This study investigates the influence of two thermally reduced graphene oxides with different oxygen levels on the barrier properties of TPU nanocomposites. The addition of TRGO increased the Young modulus of the composites and enhanced their barrier properties, leading to a significant decrease in oxygen permeability.
Article
Engineering, Chemical
Natalia Paprota, Piotr Szatkowski, Monika Szlachta, Wojciech Piekarczyk, Kinga Pielichowska
Summary: Modified polyurethane scaffolds were synthesized using starch and magnetite for potential orthopedic applications. The addition of magnetic particles did not significantly affect the properties of the materials compared to starch. The prepared polyurethanes have the potential to be used in orthopedics for filling or replacing bone defects and undergoing hyperthermia treatment.
ADVANCES IN POLYMER TECHNOLOGY
(2022)
Article
Chemistry, Multidisciplinary
Anett Juhasz, Uneri Haymana Serra, Csilla Lakatos, Bence Vadkerti, Anita Ragyanszki, Odon Farkas, Sandor Keki, Lajos Nagy
Summary: The kinetics of the urethane forming reactions of HDI, HMDI, and IPDI with butan-1-ol were investigated using ESI-MS. A consecutive model of A → B → C was found to describe the kinetics well, and the rate coefficients were determined. The reactivities of the diisocyanates were found to decrease in the order HDI > IPDI > HMDI. The second isocyanate group in HDI reacted faster with butan-1-ol due to intramolecular hydrogen bonding, while the reactivity of the second isocyanate moiety in HMDI did not change significantly.
NEW JOURNAL OF CHEMISTRY
(2023)
Article
Polymer Science
Natascha Riehle, Kiriaki Athanasopulu, Larysa Kutuzova, Tobias Gotz, Andreas Kandelbauer, Gunter E. M. Tovar, Gunter Lorenz
Summary: The study investigated the impact of hard segment content and diisocyanate structure on the transparency and mechanical properties of soft PDMS-based urea elastomers. PSU elastomers showed good elastomeric properties, with transparency decreasing as hard segment content increased, and Young's modulus and ultimate tensile strength increasing linearly with hard segment content.
Article
Materials Science, Multidisciplinary
Jean-Emile Potaufeux, Jeremy Odent, Delphine Notta-Cuvier, Sophie Barrau, Chiara Magnani, Remi Delille, Chunbo Zhang, Guoming Liu, Emmanuel P. Giannelis, Alejandro J. Mueller, Franck Lauro, Jean-Marie Raquez
Summary: This study proposes an investigation into the fundamental mechanisms underlying the performance of ionic hybrid materials by examining the effects of ionic interactions and nanoparticle reinforcement, aiming to understand the reinforcement mechanisms of ionic materials.
ACS APPLIED POLYMER MATERIALS
(2021)
Article
Polymer Science
Xin Luo, Yuanpeng Wu, Meiling Guo, Xi Yang, Lingyun Xie, Jingjuan Lai, Zhenyu Li, Hongwei Zhou
Summary: This study successfully prepared a polyurethane/graphene oxide composite with self-healing and shape memory properties, exhibiting excellent mechanical properties and thermal stability.
JOURNAL OF APPLIED POLYMER SCIENCE
(2021)
Article
Polymer Science
Zhijia Zhang, Hao Jiang, Rui Li, Shan Gao, Qiang Wang, Guojun Wang, Xiao Ouyang, Hao Wei
Summary: The study utilized the high-damping property of polyurethane elastomers and the low density of hollow glass microspheres to prepare sound insulation materials, with results showing that the addition of microspheres improved the hardness and compression modulus of the composites, leading to enhanced sound insulation properties.
JOURNAL OF APPLIED POLYMER SCIENCE
(2021)
Article
Gastroenterology & Hepatology
Yoshikazu Inagaki, Naohisa Yoshida, Kohei Fukumoto, Kyoichi Kassai, Ken Inoue, Ryohei Hirose, Osamu Dohi, Takashi Okuda, Daisuke Hasegawa, Kotaro Okuda, Kiyoshi Ogiso, Takayuki Motoyoshi, Hiroyuki Yoriki, Takaaki Murakami, Yoshito Itoh
Summary: The incidence rate of delayed bleeding after cold snare polypectomy was very low at 0.14%, with antithrombotic drug use, polyp size, location, and morphology being significant risk factors for its occurrence.
DIGESTIVE DISEASES AND SCIENCES
(2022)
Article
Chemistry, Multidisciplinary
Daiki Ihara, Yuji Higaki, Norifumi L. Yamada, Fumiya Nemoto, Yasuhiro Matsuda, Ken Kojio, Atsushi Takahara
Summary: The molecular mechanisms underlying the cononsolvency of PMPC in ethanol-water mixtures were studied through a combination of statistical mechanical models and neutron reflectivity experiments. The preferential interaction of water and the strong cooperativity of ethanol were identified, resulting in the collapsed PMPC chains being more solvated with water than the bulk mixed solvent at an ethanol volume fraction of 0.90.
Article
Hematology
Asahito Hama, Daisuke Hasegawa, Atsushi Manabe, Kazue Nozawa, Atsushi Narita, Hideki Muramatsu, Yoshiyuki Kosaka, Masao Kobayashi, Katsuyoshi Koh, Yoshiyuki Takahashi, Kenichiro Watanabe, Akira Ohara, Masafumi Ito, Seiji Kojima
Summary: The study found that childhood refractory cytopenia of childhood (RCC) can be divided into two categories: RCC without multilineage dysplasia (RCC-w/o-MLD) and RCC with multilineage dysplasia (RCC-MLD). Patients in both categories typically have a high incidence of chromosomal abnormalities at diagnosis and a significant risk of secondary graft failure after hematopoietic cell transplantation.
BRITISH JOURNAL OF HAEMATOLOGY
(2022)
Letter
Hematology
Eline J. M. Bertrums, C. Michel Zwaan, Daisuke Hasegawa, Valerie de Haas, Dirk N. Reinhardt, Franco Locatelli, Barbara de Moerloose, Michael Dworzak, Arjan Buijs, Petr Smisek, Alexandra Kolenova, Cornelis Jan Pronk, Jan-Henning Klusmann, Ana Carbone, Alina Ferster, Evangelia Antoniou, Soheil Meshinchi, Susana C. Raimondi, Charlotte M. Niemeyer, Henrik Hasle, Marry M. van den Heuvel-Eibrink, Bianca F. Goemans
Article
Oncology
Yuki Arakawa, Daisuke Hasegawa, Takako Miyamura, Junjiro Ohshima, Shunsuke Kimura, Toshihiko Imamura, Yuhki Koga, Shohei Yamamoto, Atsushi Ogawa, Kunihiro Shinoda, Mariko Eguchi, Hajime Hosoi, Kohsuke Imai, Katsuyoshi Koh, Daisuke Tomizawa
Summary: The study retrospectively investigated the immune status of infants with ALL after chemotherapy and found that severe chemotherapy-induced immunodeficiency appears to be rare in these infants.
PEDIATRIC BLOOD & CANCER
(2022)
Article
Veterinary Sciences
Daisuke Hasegawa, Miyoko Saito, Masato Kitagawa
Summary: This article summarizes the current standards of intracranial epilepsy surgery in human medicine and discuss its current status and expectation in veterinary medicine. Corpus callosotomy is the most common disconnection surgery for drug-resistant epilepsy in dogs. However, other types of disconnection and resection surgeries for focal epilepsy are limited to experimental studies and anecdotal case reports. Veterinary epilepsy surgery is a new and challenging field, but with the development of advanced presurgical evaluations, it may become more widespread.
VETERINARY JOURNAL
(2022)
Article
Multidisciplinary Sciences
Takeshi Kikuchi, Masahiro Wada, Tomoaki Mameno, Daisuke Hasegawa, Giovanni Serino, Kazunori Ikebe
Summary: This study assessed the correlation between bone loss around dental implants and the amount of keratinized tissue width. The results showed that keratinized mucosa is important for maintaining the health of peri-implant bone.
Article
Oceanography
S. Itoh, E. Tsutsumi, E. Masunaga, T. T. Sakamoto, K. Ishikawa, D. Yanagimoto, Y. Hoshiba, H. Kaneko, D. Hasegawa, K. Tanaka, H. Fukuda, T. Nagata
Summary: The Sanriku Confluence in Japan is a dynamic mixing region where different ocean currents converge. High-resolution observations were conducted to study the transition processes between water masses in this area. The results show the existence of prominent fronts and various water masses, indicating that the mixing in the Sanriku Confluence may not be complete.
JOURNAL OF GEOPHYSICAL RESEARCH-OCEANS
(2022)
Article
Polymer Science
Zhixing Huang, Yashasvi Bajaj, Jan-Michael Y. Carrillo, Yohei Nakanishi, Kiminori Uchida, Kazuki Mita, Takeshi Yamada, Tsukasa Miyazaki, Bobby G. Sumpter, Maya Endoh, Tadanori Koga
Summary: The interface between the polymer matrix and carbon fiber (CF) in carbon fiber reinforced polymers (CFRPs) significantly affects the macroscopic properties of CFRPs. This study characterized the bound polymer layer (BPL) on the CF surface using experimental and simulation techniques, and found that the crystallinity of the BPL was lower than the bulk, and the bound chains exhibited faster dynamics and formed a high-density region near the CF surface.
Editorial Material
Chemistry, Multidisciplinary
Hendrik Heinz, Yogesh M. Joshi, Hongbo Zeng, Heng-Kwong Tsao, Sissi J. A. de Beer, Erin Koos, Atsushi Takahara, Gilbert C. Walker
Article
Materials Science, Multidisciplinary
Yucheng Zhang, Koichi Hasegawa, Sota Kamo, Kiyoka Takagi, Atsushi Takahara
Summary: Epoxy adhesives are crucial in the manufacturing of various components and products in industrial and daily use. Modifying the surface of adherents with PGMA greatly improves the lap shear strength of epoxy adhesive-bonded joints. The effect of PGMA layer thickness on reinforcement is still uncertain.
ACS APPLIED POLYMER MATERIALS
(2023)
Article
Chemistry, Multidisciplinary
Sinan Feng, Yokajaksusri Nutthon, Hiroyasu Masunaga, Sono Sasaki, Roman Selyanchyn, Shigenori Fujikawa, Shinichi Murata, Atsushi Takahara
Summary: This study investigated the impact of morphology on the gas transport properties of a poly-(ether-block-amide) (PEBA) multiblock copolymer. Annealing temperature was varied to evaluate changes in microstructure and gas transport properties of PEBA. Time-resolved attenuated total reflection Fourier transform infrared spectroscopy was used to determine the diffusion coefficient of CO2 in PEBA. The findings revealed a 38% increase in CO2 permeability in the annealed sample, while maintaining a high CO2/N-2 permselectivity.
Article
Oncology
Daisuke Tomizawa, Shin-ichi Tsujimoto, Shiro Tanaka, Jun Matsubayashi, Takahiro Aoki, Shotaro Iwamoto, Daisuke Hasegawa, Kozo Nagai, Kentaro Nakashima, Koji Kawaguchi, Takao Deguchi, Nobutaka Kiyokawa, Kentaro Ohki, Hidefumi Hiramatsu, Norio Shiba, Kiminori Terui, Akiko Moriya Saito, Motohiro Kato, Takashi Taga, Tsugumichi Koshinaga, Souichi Adachi
Summary: This study aims to establish an appropriate treatment for children with de novo acute myeloid leukemia, based on recurrent leukemic cytogenetic abnormalities and flow-cytometric minimal residual disease. It also aims to validate the safety and efficacy of gemtuzumab ozogamicin combined with post-induction chemotherapy for non-low-risk patients.
JAPANESE JOURNAL OF CLINICAL ONCOLOGY
(2022)
Meeting Abstract
Critical Care Medicine
Daisuke Hasegawa, Ryota Sato, Narut Prasitlumkum, Kazuki Nishida, Osamu Nishida
CRITICAL CARE MEDICINE
(2022)
Article
Chemistry, Physical
Ken Kojio, Aya Fujimoto, Chigusa Nagano, Shuhei Nozaki, Kazutoshi Yokomachi, Kazutaka Kamitani, Hirohmi Watanabe, Atsushi Takahara
Summary: In this study, the specific deformation behavior of crystalline polymer films under a multiaxial stress field was investigated. The experiments revealed that the string-shaped crystalline polymer chain structure produces local anisotropic uniaxial stress, leading to changes in the aggregation structure of the films.