| POLYMERS Vol.60 No.12 |
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COVER STORY
New Development of Fluorinated Polymers |
| COVER STORY: Highlight Reviews |
| Post-Functionalization of Conjugated Polymers by Selective Electrochemical Fluorination | Shinsuke INAGI and Toshio FUCHIGAMI |
| <Abstract>
Recently, selective fluorination of organic compounds has attracted much attention
in a variety of research fields. In polymer chemistry, selective fluorination
of conjugated polymers is
a significant issue because it can impart a number of functions to the
parent polymers. The electrochemical polymer reaction involves the electron
transfer between a conjugated polymer film and an electrode, followed
by chemical reaction of the intermediates. Based on this method, selective
fluorination of conjugated polymers is successfully
achieved. Keywords: Electrochemical Fluorination / Conjugated Polymer / Polymer Reaction / Solid-Phase Reaction / Electron Transfer |
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| Development of Decomposition Techniques for Fluoropolymers and Related Chemicals | Hisao HORI |
| <Abstract> Fluoropolymers and related chemicals have been widely used owing to their specific
characters such as high thermal and chemical stabilities, high light
transparency and so forth. These materials can be decomposed by incineration.
However, this requires high temperatures because they consist of strong
C-F bonds, and HF gas is formed, which can seriously damage the firebricks
of incinerators. Thus, there is virtually no waste-treatment method except
for disposal in a landfill. Here we describe new decomposition techniques
aimed at waste treatment of these materials, allowing for the recycling
of the fluorine resource, which faces an increasing global demand. Keywords: Fluorine / Waste / Monomerization / Mineralization / Subcritical Water / Surfactant / PFOA/PFOS |
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| High-Performance Electret Based on Fluorinated Polymer for Energy Harvesting | Yuji SUZUKI |
| <Abstract> Energy
harvesting from environmental vibration attracts much attention for its
use in battery-less wireless sensor network nodes. Such a system can
be used in various applications such as structural health monitoring
systems. Among various energy conversion principles from environmental
vibration, the electret generator can produce higher output power especially
in the low frequency range. Here, our attempts for high-performance polymer
electret and MEMS generator are introduced and future vision of energy
harvesting is discussed. Keywords: Electret / Fluorinated Polymer / Energy Harvesting / MEMS |
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| Super-Water-Repellent and Highly-Oil-Repellent Coating with Fluoric Compounds with Nano Particles | Seimei SHIRATORI |
| <Abstract> In
order to keep our body safe, the development of coating agents and coating
techniques to fabricate a super-water-repellent and highly-oil-repellent
surface for textiles is strongly desired. By the combination of a chemical
and physical approach, a special coating agent was newly developed. It
contains several compounds, which are a fluoric coating agent and a solvent.
Fabrics are easily soaked in the newly developed coating agent. It was
demonstrated that the coating agent can be successfully applied to various
textiles such as cotton, mixture fabric of cotton and nylon, and cotton
and polyester. The repeatability of the fabricated coating sample was
excellent. Keywords: Repellent / Water / Oil / Protection / Antifouling |
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| COVER STORY:Topics and Products |
| PVdF Binder of Lithium Ion Battery | Mitsuyasu SAKUMA |
| <Abstract> PVdF
(polyvinylidenefluoride) is a worldwide used polymer as a binder material
for lithium ion secondary battery electrodes. Characteristic features
of PVdF material satisfy the various functions required in the electrode
manufacturing process and battery performance. As an example of binder
function, the adhesive mechanism with the types of PVdF and their molecular
weight is shown in this paper. Keywords: PVdF / Binder / Lithium Ion / Battery / Electrochemical / Crystalline / Molecular Weight |
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| Synthesis and Application of Perfluoropolyethers | Daisuke SHIRAKAWA |
| <Abstract> Perfluoropolyethers
(PFPE) have an excellent fluidity and low surface friction. These fluorinated
oils are employed as grease, lubricant and modification in various fields.
As applications
require higher performance and reliability, the technology of the PFPE
is facing more challenging tasks regarding its tribological performance. Keywords: Perfluoropolyether / Fluorination / Lubricant / Hard Disk Drive |
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| Dynamic Liquid Repellency of Fluoroacrylate Homopolymers | Masamichi MORITA and Ikuo YAMAMOTO |
| <Abstract> The
effect of the α position structure of fluoroacrylate homopolymers with
short fluoroalkyl (Rf) chains on dynamic liquid repellency was characterized
by sliding angle and sliding velocity
values. We developed a Rf(Cn)α-Cl acrylate homopolymer, which shows a
very high dynamic liquid repellency compared with Rf(Cn) acrylate and
Rf(Cn) methacrylate. This result is suggesting that the surface molecular
mobility of Rf chains is restricted by α-Cl groups and the surface rearrangement
is hard to achieve. Keywords: Dynamic Liquid Repellency / Sliding Angle / Sliding Velocity / Contact Angle / Fluoroacrylate |
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| Fluorinated Materials Used in Hybrid Electric Vehicles | Michiaki SHIMIZU |
| <Abstract> Many
parts used in the construction of vehicles have been developed by taking
advantage of fluorinated materials. In applications for HEVs, heat resistance
and oil resistance are nominated as one of the most required features. Keywords: Hybrid Electric Vehicle / Heat Resistant / Oil Resistant / Cable / Harness |
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| Front-Line Polymer Science |
| Investigation of Optimized Conjugated Polymer Backbone Structures for Charge Carrier Transport | Shu SEKI |
| <Abstract> Recent
successful reports on the variety of organic and/or organic-inorganic
compounds with conjugated electronic systems based on covalent/non-covalent
chemical bondings have extended rapidly the feasibility of the compounds
as practical electronic devices. One of the most important properties
of the materials is the mobility of charge carriers because the value
is determining and dominating all the device performance including switching
rate, energy efficiency, reliability, etc. In the present paper, electrode-less
microwave conductivity measurement techniques have been applied to determine
the value of mobility in the conjugated macromolecular/supramolecular
systems, and we discuss comprehensively the mechanisms of charge carrier
transports in the materials in view of what are the formative processes
of the charge carrier transport in the respective three measurement systems.
This leads to the optimization of the mobility value in a variety of
the organic materials, making these materials a good choice to challenge the conventional inorganic semiconductor materials used by industries
and substitute them in part by the organic materials. Keywords: Conjugated Polymers / Mobility / Microwave / Time-of-Flight / Field-Effect-Transistor / Semiconductor/ Molecular Wires / Non-Contact / Ultra-High Pressure |
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