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Higashihara Tomoya,Inoue Kyoichi,Nagura Masato,Hirao Akira The Polymer Society of Korea 2006 Macromolecular Research Vol.14 No.3
To successively synthesize star-branched polymers, we developed a new iterative methodology which involves only two sets of the reactions in each iterative process: (a) an addition reaction of DPE or DPE-functionalized polymer to a living anionic polymer, and (b) an in-situ reaction of 1-(4-(4-bromobutyl)phenyl)-1-phenylethylene with the generated 1,1-diphenylalkyl anion to introduce one DPE functionality. With this methodology, 3-, 4-, and 5-arm, regular star-branched polystyrenes, as well as 3-arm ABC, 4-arm ABCD, and a new 5-arm ABCDE, asymmetric star-branched polymers, were successively synthesized. The A, B, C, D, and E arm segments were poly(4-trimethylsilylstyrene), poly(4-methoxystyrene), poly(4-methylstyrene), polystyrene, and poly(4-tert-butyldimethylsilyloxystyrene), respectively. All of the resulting star-branched polymers were well-defined in architecture and precisely controlled in chain length, as confirmed by SEC, $^1H$ NMR, VPO, and SLS analyses. Furthermore, we extended the iterative methodology by the use of a new functionalized DPE derivative, 1-(3-chloromethylphenyl)-1-((3-(1-phonyletheny1)phenyl) ethylene, capable of introducing two DPE functionalities via one DPE anion reaction site in the reaction (b). The number of arm segments of the star-branched polymer synthesized by the methodology could be dramatically increased to 2, 6, and up to 14 by repeating the iterative process.
Polymer electrolyte membrane based on polyacrylate with phosphonic acidvia long alkyl side chains
Higashihara, Tomoya,Fukuzaki, Namiko,Tamura, Youko,Rho, Yecheol,Nakabayashi, Kazuhiro,Nakazawa, Satoshi,Murata, Shigeaki,Ree, Moonhor,Ueda, Mitsuru The Royal Society of Chemistry 2013 Journal of Materials Chemistry A Vol.1 No.4
Hiroki Higashihara,Yusuke Ono,Kaisyu Tanaka,Kosuke Tomotake,Noriyuki Tomiyama 소화기인터벤션의학회 2021 International journal of gastrointestinal interven Vol.10 No.4
Conventional transarterial chemoembolization (TACE) using ethiodized oil and gelatin sponge (GS) particles is a standard treatment for unresectable BCLC-B stage hepatocellular carcinoma (HCC). Ethiodized oil can cause temporary embolic micro-interactions in tumor sinuses, portal veins, hepatic venous sinuses, and arteries as a temporary embolic material for the microvasculature. Using GS particles as an added embolic material, strong ischemic effects can be achieved not only in HCC, but also in the surrounding liver parenchyma. In recent years, various technical innovations in TACE using ethiodized oil have been made in Japan to improve the outcomes of TACE, such as a device for emulsifying ethiodized oil and water-soluble anticancer drugs, the use of intraoperative embolization guidance software to plan embolization during TACE, and the introduction of various microcatheters. This report examines some of the technical innovations that have been adopted to improve TACE outcomes.
Tomoya Higashihara,Mitsuru Ueda 한국고분자학회 2013 Macromolecular Research Vol.21 No.3
Polymer-based solar cells (PSCs) have been promising candidates as renewable energy resources, having multiple advantages of flexible, low-cost and large-area processing for their mass production. Among them, much attention has been paid to fundamental bulk-heterojunction (BHJ) devices using a blend of regioregular poly(3-hexylthiophene)(P3HT) and [6,6]-phenyl-C61-butyric acid methyl ester (PCBM) as the active layer. However, there are still significant limitations not only in the low power conversion efficiency (PCE), but also in the device stability. The morphological control of BHJ PSCs is one of the most important issues to improve the device performances. On the other hand, P3HT itself has received much attention in many fields, because it is the best class of balanced high-performance materials as a p-type semiconductor in terms of solubility, chemical stability, charge mobility, and commercial availability. The discovery of the quasi-living Grignard metathesis polymerization (or called catalysttransfer polycondensation) system has made it possible to synthesize a wide variety of chain-end-functional P3HT derivatives, their block copolymers and star-branched polymers. Since the competitive research areas including PSC applications have strongly demanded the accelerated developments of new materials and well-defined morphologies related to polythiophenes, the fundamental studies of P3HT have still been targeted by many research groups. In this review, the controlled synthesis of P3HT, the synthesis of P3HT-based block copolymers, their applications to PSCs,as well as the scope and potential of new thiophene-based materials are described.
Hiroki Higashihara,Yusuke Ono,Kaisyu Tanaka,Kosuke Tomotake,Noriyuki Tomiyama 소화기인터벤션의학회 2021 Gastrointestinal Intervention Vol.10 No.4
Conventional transarterial chemoembolization (TACE) using ethiodized oil and gelatin sponge (GS) particles is a standard treatment for unresectable BCLC-B stage hepatocellular carcinoma (HCC). Ethiodized oil can cause temporary embolic micro-interactions in tumor sinuses, portal veins, hepatic venous sinuses, and arteries as a temporary embolic material for the microvasculature. Using GS particles as an added embolic material, strong ischemic effects can be achieved not only in HCC, but also in the surrounding liver parenchyma. In recent years, various technical innovations in TACE using ethiodized oil have been made in Japan to improve the outcomes of TACE, such as a device for emulsifying ethiodized oil and water-soluble anticancer drugs, the use of intraoperative embolization guidance software to plan embolization during TACE, and the introduction of various microcatheters. This report examines some of the technical innovations that have been adopted to improve TACE outcomes.
Pressure-enhanced Giant Magnetoresistance in Fe/Cr Magnetic Multilayers
Gendo Oomi,Shuhei Higashihara,Kazufumi Suenaga,Kesami Saito,Koki Takanashi,Seiji Mitani 한국물리학회 2013 THE JOURNAL OF THE KOREAN PHYSICAL SOCIETY Vol.62 No.12
The magnetoresistance of Fe/Cr magnetic multilayers (MMLs) on the 1st and the 2nd peakshas been measured at high pressure up to 3 GPa at low temperature in order to make clear thecharacteristics of the giant magnetoresistance (GMR) under high pressure. The GMRs of the MMLson the 2nd peak are found to be enhanced strongly by applying pressure whereas those of 1st peakMMLs decrease with increasing pressure. The magnitude of GMR of the 2nd peak MMLs becomesabout twice or more at 2 GPa compared with the value at ambient pressure. The large differencein the pressure dependences is explained by assuming a pressure-induced crossover in the interlayerexchange coupling from the biquadratic to the bilinear spin arrangements.