| POLYMERS Vol.58 No.11 |
| >> Japanese | >> English | >> Korean | >> Chinese |
|
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. |
| Top of the Page▲ |
| 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. |
| Top of the Page▲ |
| 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 |
| Top of the Page▲ |
| 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 |
| Top of the Page▲ |
| 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 |
| Top of the Page▲ |
| 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 |
| Top of the Page▲ |
| 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 |
| Top of the Page▲ |
| 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 |
| Top of the Page▲ |
| 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 |
| Top of the Page▲ |
| 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 |
| Top of the Page▲ |
| 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 |
| Top of the Page▲ |
| 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 |
| Top of the Page▲ |
| 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 |
| Top of the Page▲ |
| Copyright(C) 2009 The Society of Polymer Science, Japan All Rights Reserved. |