巻号一覧
66 巻, 5 号
選択された号の論文の11件中1～11を表示しています
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大石 基, 長崎 幸夫2008 年 66 巻 5 号 p. 428-435
発行日: 2008/05/01
公開日: 2010/06/28
ジャーナル フリーWe described here novel approach to the precise synthesis of the heterotelechelic PEG deriva-tives to prepare pH-responsive PEGylated nanogels for pinpoint cancer diagnosis and therapy. In particular, use of potassium 3, 3-diethoxy-1-propanolate as an initiator for the polymerization of ethylene oxide gave various heterotelechelic PEGs with well-defined structure, high yield, and high purity. The pH-responsive PEGylated nanogels composed of cross-linked poly[2-(N, N-diethylamino) ethyl methacrylate] (polyamine) core and PEG tethered chains bearing a functional group(acetal group or carboxylic acid group) as a platform moiety for the installation of ligand molecules were synthesized by emulsion polymerization of vinyl benzyl group-ended heterotelechelic PEG, amine monomer, and cross-linker. In addition, PEGylated nanogels show unique properties and functions in synchronizing with the reversible volume phase transition of the polyamine gel core in response to pH. We list some of the biomedical applications of the nanogels, including tumor-specific 19F MRI probes and tumor-specific drug delivery carriers.抄録全体を表示PDF形式でダウンロード (2699K) -
冨田 育義2008 年 66 巻 5 号 p. 436-443
発行日: 2008/05/01
公開日: 2010/06/28
ジャーナル フリーPolymers possessing reactive organometallic repeating units in the main chain are potentially applicable to novel reactive polymers which serve as powerful synthetic precursors for various main chain-functionalized materials. Accordingly, organometallic polymers containing metallacycles such as cobaltacyclopentadiene and titanacyclopentadiene were prepared and their reactions were studied. The metallacyclopentadiene-containing polymers were prepared by the reactions of diynes with low-valent organometallic complexes. Cobaltacyclopentadiene-containing polymers are air-stable materials that can be converted into other organocobalt polymers possessing cyclobutadinecobalt and cobalticinium units and into organic polymers with diverse main chain functionality. Likewise, regioregular organotitanium polymers produced from aromatic terminal diynes and low-valent titanium complexes provide ic-conjugated organic polymers possessing unsaturated backbones in the main chain by their polymer reactions. Properties of the organometallic polymers will also be described.抄録全体を表示PDF形式でダウンロード (2467K) -
寺尾 浩志, 永井 直, 藤田 照典2008 年 66 巻 5 号 p. 444-457
発行日: 2008/05/01
公開日: 2010/06/28
ジャーナル フリーThis contribution reports on the unique olefin polymerization catalysis of the new catalysts developed at Mitsui Chemicals and the associated synthesis of value-added olefin-based materials. Research based on a "ligand oriented catalyst design concept" has resulted in the discovery of a series of high-performance imine-based group 4 transition metal complex catalysts, represented by bis (phenoxy-imine) early transition metal catalysts (FI catalysts) and bis (pyrrolide-imine) group 4 transition metal catalysts (PI catalysts). These imine-based catalysts possess distinctive features that result in characteristic polymerization catalysis and unique polymer synthesis. The features include presence of structural isomers, fluxional character regarding the interconversion of the structural isomers, high electrophilicity of a catalytically active species, susceptibility to reduction at the imine functionality, and versatility vis-a-vis activator selection. With these fea-tures, the catalysts can form a wide variety of unique olefin-based materials, which include vinyl-terminated polyethylenes (PEs), well-defined and multimodal PEs, ultra-high molecular weight ethylene/a-olefin copolymers, highly isotactic and syndiotactic PPs (iPPs and sPPs), regio- and stereoirregular high molecular weight poly(higher a-olefin)s, and ultra-fine particle PEs. Additionally, we have found that these catalysts are capable of mediating highly controlled living olefin (co) polymerizations to produce a wide array of block copolymers from ethylene, propylene, higher a-olefins and norbornene. Moreover, we have successfully synthesized well-defined functionalized PEs, PE/polar polymer hybrid materials (from vinyl-terminated PEs) and functionalized ultra-fine particle PEs (from ultra-fine particle PEs). Many of the olefin-based materials described above were unavailable prior to our work.抄録全体を表示PDF形式でダウンロード (7650K) -
青合 利明2008 年 66 巻 5 号 p. 458-467
発行日: 2008/05/01
公開日: 2010/06/28
ジャーナル フリーA photopolymer material has been widely used in negative-type photosensitive composition (e.g. as a radical or an acid catalyzed polymerization). A large number of photo-initiator com-pounds for these compositions have been developed corresponding to many industrial demands such as coatings (overcoats, adhesives), graphic materials (printing plates, inks), electronic materi-als (printed circuit, micro-resist, color filter), and recording materials (holography). With recent development of light source especially for IR, Visible, and UV lasers, there is a growing interest to increase their photo-sensitivity. To perform much higher sensitivity, dye sensitizers are usually utilized in both radical and cationic photo-polymerization, and are elaborately designed in combi-nation of initiators. The dye sensitization is mainly classified into 1) electron transfer mechanism and 2) energy transfer mechanism. The dyes, therefore, are controlled and adjusted to their physi-cal properties such as wave length, redox potential, and excited energy level according to the mechanism. In this paper, the classification of these initiators/dye sensitizers and their character-istics are shortly described. Furthermore a few recent applications are introduced as an example of high sensitive material.抄録全体を表示PDF形式でダウンロード (5710K) -
照田 尚2008 年 66 巻 5 号 p. 468-476
発行日: 2008/05/01
公開日: 2010/06/28
ジャーナル フリーA lot of optical recording media have been proposed, but only CD-R and DVD-R media are widely accepted. They have many advanced features, such as high compatibility to ROM player because of their high reflectivity, as well as easy and low cost production by applying a simple design comprising a dye recording layer and a reflective layer, and by applying a spin-coating method to form the dye recording layer. Most important factor to realize such advantage is development of organic dyestuffs. In this review, I will introduce what it takes to put the dyestuffs into practical use and the dyestuffs that survive the tough race.抄録全体を表示PDF形式でダウンロード (2735K) -
中澄 博行, 八木 繁幸2008 年 66 巻 5 号 p. 477-487
発行日: 2008/05/01
公開日: 2010/06/28
ジャーナル フリーNovel bis-squaraine dyes have been synthesized in which two squaraine moieties are conjuga-tively linked by a methine group, thiophene, oligothiophene or arene spacer. New unsymmetrical squarylium dyes have been also prepared by condensation of mono-substituted squaric acid (semi-squaraine acid) with heterocyclic compounds with active methyl group or arylamines. These dyes exhibit large and intense absorption in the near-infrared region, and the X-ray structural analyses of these dyes show a planar structure. Semi-squaraine acids are key precursors for the synthesis of unsymmetrical squarylium dyes, and exhibited their absorption maxima at the shorter wavelength. Applications of squarylium dyes to photoconductive materials, photovoltatic devices, biological and environmental analysis are described. A Ca2+ ion-induced allostreic assem-bling of the squarylium dimmer was confirming by ESI-MS measurement showing the formation of metallo supramolecular complexes, that is the H-aggregate composed of at least three units.抄録全体を表示PDF形式でダウンロード (2593K) -
陸川 政弘2008 年 66 巻 5 号 p. 488-492
発行日: 2008/05/01
公開日: 2010/06/28
ジャーナル フリーPolymer electrolyte fuel cells (PEFCs) have received much attention for new power source of vehicles and mobile applications. Proton conducting polymer electrolytes are one of key components for PEFCs and are required further performance gains. Hydrocarbon polymer electrolytes are expected to surpass commercial fluorinated polymer electrolytes in the cost and performance at high temperature and low humidity. In this paper, I introduce the hydrocarbon polymer electrolytes, synthesis, and fuel cell performance. These materials show excellent proton conductivity and unique water uptake behavior even at high temperature. Although hydrocarbon materials exhibited lower chemical stability than fluorinated materials, their fuel cells have possessed high reliability and durability.抄録全体を表示PDF形式でダウンロード (2223K) -
八尋 正幸, 坂上 知, 内生 蔵広幸, 小山田 崇人, 年光 昭夫, 安達 千波矢2008 年 66 巻 5 号 p. 493-503
発行日: 2008/05/01
公開日: 2010/06/28
ジャーナル フリーIn this study, we report on material design of light-emitting organic field effect transistors (LE-OFETs). Some of newly synthesized pyrene and bis-styryl derivatives as an active layer demonstrated high field effect mobility (μh = 0.11 cm /Vs, C6-BSBP) and high photoluminescence efficiency (φPL-80%, symmetrical di-substituted pyrene derivatives). Further, external electroluminescence quantum efficiency was improved from 0.01% in TPPy to 0.15-0.54% in pyrene dimmers. In addition, we demonstrate an increase of EL efficiency by introducing guest-host system and ambipolar operation mechanism.抄録全体を表示PDF形式でダウンロード (7379K) -
家 裕隆, 安蘇 芳雄2008 年 66 巻 5 号 p. 504-514
発行日: 2008/05/01
公開日: 2010/06/28
ジャーナル フリーOrganic field-effect transistors (OFETs) based on ir-conjugated systems have been a great interest in recent years as they are indispensable components in organic electronics. In this con-text, a novel synthetic route to electronegative units: hexafluorocyclopenta [c] thiophene, 4, 4-diflu-oro-4H-cyclopenta [2, 1-b:3, 4-b'] dithiophene, 6, 6, 12, 12-tetrafluoroindeno [3, 2-b] fluorene, difluoro-dioxocyclopenta [c] thiophene, and difluorodioxocyclopenta [b] thiophene have been accomplished by the use of fluorination reactions as a key step. The oligomers containing these units also have been synthesized to elucidate the precise structure-property-FET characteristics relationships. The annelation of the electron-withdrawing groups effectively lowers the LUMO energy levels without disrupting the effective conjugation of the backbones, which was unambiguously clarified by spectroscopic and electrochemical measurements as well as X-ray analyses. These electroneg-ative oligothiophenes exhibited n-type semiconducting behavior with high field-effect electron mobilities.抄録全体を表示PDF形式でダウンロード (3367K) -
西田 純一, 山下 敬郎2008 年 66 巻 5 号 p. 515-524
発行日: 2008/05/01
公開日: 2010/06/28
ジャーナル フリーMuch attention has been focused on organic field-effect transistors (OFET) s from view point of application purposes for electronic devices as well as basic interest in charge transportation. Development of new semiconductors showing high-performance FET characteristics is particularly important to make progress in this field. For this purpose, we have designed various kinds of heterocyclic compounds with electron-donating or accepting properties. We have used tetrathiafulvalene (TTF) derivatives as semiconductors. High hole mobilities were achived by introducing naphthalene (0.42 cm2/Vs) or quinoxaline (0.20 cm2/Vs) rings to the TTF unit. Furthermore, we have introduced electron-withdrawing halogen groups into the quinoxaline group and found that the derivatives showed high performance n-type behavior. We have also developed high performance n-type FETs by introducing trifluoromethylphenyl groups in heterocyclic π-electron systems. The bithiazole and thiazolothiazole derivatives showed high electron mobilites over 1 cm2/Vs. Decrease of the threshold values was accomplished by introducing strong electron-withdrawing heterocycles such as a benzothiadiazole ring.抄録全体を表示PDF形式でダウンロード (2705K) -
2008 年 66 巻 5 号 p. 525
発行日: 2008/05/01
公開日: 2010/06/28
ジャーナル フリーPDF形式でダウンロード (211K)
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