POLYMERS Vol.58　No.11 November 2009
POLYMERS　Vol.58　No.11
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COVER STORY
Elements and Polymers
Polymer Science and I: A Personal Account
Movement from Natural Products to Soft Materials Yasuhito KOYAMA
<Abstract>My research is focused on effective synthetic methods for highly complicated architectures exploiting kinetically stabilized species such as enediyne, ortho-quinol, and nitrile N-oxides. This synthetic approach enabled me to achieve the practical conversion into high performance materials without catalysts, byproducts, in addition to solvents, emphasizing the advantage in a viewpoint of green chemistry.
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An Encounter with Research Theme Nobuji SAKAI
<Abstract>According to my personal interests, I encountered with current research theme. I changed my impression of that after I actually tried.
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COVER STORY: Highlight Reviews
Design and Synthesis of Phosphorus Containing π-Conjugated Materials Takanobu SANJI and
Masato TANAKA
<Abstract>Recently, the design and synthesis of novel π-conjugated systems containing phosphorus have been active areas of research. This is because the structural and the orbital interactions of the phosphorus atom plays an intriguing role in the π-conjugated framework. In addition, phosphoros retains a versatile reactivity to offer the possibility of tuning the electronic properties of the materials by simple chemical modifications such as oxidation. This review focuses on recent advances in the design and synthesis of phosphorus containing π-conjugated systems.
Keywords: Elements Science / Phosphorus / Phosphole / π-conjugated Polymer
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Photo-Physics and Electroluminescence Characteristics of Organic Metal Complexes Chihaya ADACHI and Ayataka ENDO
<Abstract>We review on the photo-physics and electroluminescence characteristics of organic metal complexes. In particular, we mention a novel electroluminescence mechanism. Sn4+-porphyrin complexes that exhibit thermally activated delayed fluorescence (TADF) were examined as an OLED’s emitter. The TADF intensities increased with increase of temperature due to an acceleration of the reverse intersystem crossing from triplet to singlet excited states by heat activation under electrical excitation.
Keywords: OLED, Electroluminescence / Sn4+-Porphyrin / Thermally Activated Delayed Fluorescence (TADF) / Organic Metal Complexes
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Electronics Application of Oligothiophene Derivatives Yoshio ASO
<Abstract>Among π-conjugated oligomeric molecules, oligothiophenes are one of the most potential systems as organic semiconducting materials for a variety of organic electronics and molecular electronics. Here, as most recent topics in this field, n-type semiconducting oligothiophenes, practical oligothiophene molecular wires, and dendritic branched oligothiophenes are briefly described.
Keywords: Oligothiophene / Organic Semiconductor / Organic Electronics / Molecular Electronics / Molecular Wire / Dendrimer
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Full-Visible-Spectrum Emitters from Soluble Si-Si Bonded Network Polymers Michiya FUJIKI
<Abstract>Although pyrolysis of chain-like Si polysilane has known to efficiently produce SiC, our pyrolysis experimental results on ten soluble Si-Si bonded network-like polymer indicated the production of elemental Si. It was found that these polymers become a visible emitter tunable from 430 nm to 740 nm by controlling the pyrolysis condition and air-exposure treatment. The Si-Si bonded network polymer may be a solid source material to safely produce luminescent Si-based materials and elemental silicon.
Keywords: Silicon / Pyrolysis / Photoluminescence / Amorphous / Safety
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COVER STORY: Topics and Products
Sulfur-Containing Functional Materials for Photo-Curing Reaction Katsumi MUROFUSHI
<Abstract>Thiol compounds including sulfur can be used as curing accelerator of photo-curing reactions. In this study, we report that the secondarization of thiol group solves the stability problem of the composite and has many additional advantages for photo-curing processes such as stability problem of the composite double bonds and improved adhesion strength.
Keywords: Thiol Compound / Sulfur / Photo-Curing / Secondarization / Double Bond / Adhesion Strength
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Development of Borazine Polymers Yuko UCHIMARU
<Abstract>Borazine polymers were synthesized by hydrosilylation, hydroboration, and dehydrogenative coupling polymerizations. The resulting borazine-siloxane polymer was used as low-k dielectric thin film. Other borazine polymers were examined as preceramics materials.
Keywords: Boron / Borazine / Hydroboration, Hydrosilylation / Thin Film / Pyrolysis / Low-k
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Functional Materials Based on Polyphosphazenes Kenzo INOUE
<Abstract>Polyphosphazenes are a unique class of inorganic-organic materials that possess a wide spectrum of properties according to the nature of functional groups linked to the phosphorus atoms. The expanding application research of polyphosphazenes is described.
Keywords: Polyphosphazene / Photonic Materials / Battery Electrolytes / Fuel Cell Membranes / Superhydrophobic Materials
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Silsesquioxanes or Silicone Resins Maki ITOH
<Abstract>Synthesis, structural characteristics, properties, and applications of silsesquioxanes or silicone resins are briefly summarized. Based on the cyclotetra- and cyclopentasiloxane ring structures, these materials have the potential of creating new functions via novel structures.
Keywords: Silsesquioxane / Silicone resin / Cage / Hybrid
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Recent Development in Ionics of Organoboron Electrolytes Noriyoshi MATSUMI
<Abstract>A variety of organoboron electrolytes including organoboron anion receptors or highly dissociable lithium salt structures were developed. These electrolytes generally show significantly improved lithium transference numbers in comparison with conventional polyethers or ionic liquids. Novel organoboron ion-gel electrolytes were also recently developed in order to improve the nonflammable property of electrolytes.
Keywords: Lithium Ion Battery / Solid Polymer Electrolytes / Ionic Liquids / Anion Receptor / Dissociable Lithium Salts / Organic-Inorganic Polymer Hybrid
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Gadolinium Coordination Polymer Having MRI Visibility Tomoka KURITA
<Abstract>The polymer which linked to a gadolinium complex was designed to obtain visibility sufficient under magnetic resonance imaging (MRI). The MR-visible devices coated with the gadolinium based polymer will contribute to the development of MR-guided surgery.
Keywords: MRI / Gadolinium / Complex / Coating / Medical Device
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Front-Line Polymer Science
Reactive Polymers for Main Chain-Chemical Transformation Ikuyoshi TOMITA
<Abstract>Reactive polymers are important synthetic precursors for diverse functional materials. Incorporation of the reactive functions into the main chain of the polymers enables a unique macromolecular design such as the degradation of the polymer chains, the insertion of another polymer segments leading to the formation of block copolymers, the scrambling of the sequence in between the plural polymers, and the transformation of the functional groups of the main chain. Especially, reactions of organometallic polymers possessing reactive metallacycles allow us to prepare π-conjugated polymers with unique main chain structures and those with various elements. Diversity-oriented syntheses of functional π-conjugated polymers by the main chain-reactive polymers are also described.
Keywords: Reactive Polymers / Organometallic Polymers / Polymer Reactions / Main Chain / Functional Polymers / Elements Chemistry / Diversity-Oriented Synthesis
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