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Volume 80, Issue 5
Displaying 1-6 of 6 articles from this issue
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Kazumi NAKAYAMA, Tomoko WATANABE, Yoshito OHTAKE2007 Volume 80 Issue 5 Pages 165-171
Published: May 15, 2007
Released on J-STAGE: March 12, 2010
JOURNAL FREE ACCESSThe influences of residual peroxide on degradation and the detection methods for under-crosslinking were investigated.
The under-crosslinking of peroxide-crosslinked EPDM can be detected by differential scanning calorimetry (DSC) measurement of heat of residual crosslinking reaction, which was found to correlate with the amount of remaining dicumyl peroxide (DCP) and triallyl isocyanurate, without determination of their amounts. For the DCP-crosslinked EPDM in under-crosslinking state, it was considered that softening degradation occurs more remarkably than hardening degradation as long as the crosslinking agent remains. By surface analysis of aged DCP-crosslinked EPDM with FT-IR, it turned out that oxidative degradation of the EPDM in under-crosslinking state occurs faster than the EPDM without crosslinking agent remaining.View full abstractDownload PDF (2384K) -
Shigeki SUZUKI2007 Volume 80 Issue 5 Pages 172-178
Published: May 15, 2007
Released on J-STAGE: March 12, 2010
JOURNAL FREE ACCESSCurrently more than 850 million vehicles are used all over the world, we are facing many environmental issues such as tail pipe emission or global warming by carbon dioxide. For the measures of these issues, reducing emission by catalyst with minimum noble metals has been forwarded strongly. Lightening by materials substitution, such as high strength steel, aluminum, magnesium and plastic, has been everlastingly forwarded with the advance of materials technology. For the sustainable development, it is also important to minimize the dependence on fossil oil. We Toyota have introduced bio-plastic to mass production model in 2003. Bio fuel has been introduced some countries and Toyota will continue to develop new technologies for bio fuel. Automobiles with new power sources such as hybrid vehicles, electric vehicles or fuel-cell vehicles are strongly expected to introduce widely in the market. Safety is also the key word for forthcoming vehicle. Toyota has been developing “pre-crash safety system” that includes alarming system by monitoring driver's face direction or brake assist system. To realize this expectation, innovative development of materials is a key to the evolution of future automotive technologies. Nanotechnology, Biotechnology and Information technology will be the breakthrough fields that will revolutionize mature industrial technologies.View full abstractDownload PDF (16145K) -
Tsuyoshi TAKAKURA2007 Volume 80 Issue 5 Pages 179-183
Published: May 15, 2007
Released on J-STAGE: March 12, 2010
JOURNAL FREE ACCESSFullerene is a typical Nano-Carbon Material with interesting properties. Progressive developments of fullerene studies in the last decade suggest that many of them can be applied for practical technologies in a wide range of areas including information and electronics technology, environment, energy, materials and bio-medical fields. Examples include IT devices, photosensitive material, lithium ion battery, diagnostic agent, and improved materials as new resources for such as composite additives, and more studies are further conducted to utilize the chemical and physical properties of fullerenes.
While high production cost of fullerenes has been the main obstacle in the development of fullerene market, the first sporting goods as a fullerene product was introduced to consumer market in 2003 following the launching of fullerene mass production in 2002 by Frontier Carbon Corporation. Since then, a series of sporting goods have been commercialized in various items, and it is expected that fullerene products are to be applied to different industries in the very near future.View full abstractDownload PDF (11921K) -
Noriyuki KURAMOTO2007 Volume 80 Issue 5 Pages 184-190
Published: May 15, 2007
Released on J-STAGE: March 12, 2010
JOURNAL FREE ACCESSCharacteristic feature and applications of conducting polymers such as polyaniline, polypyrrole and polythiophene derivatives are described. Especially polyaniline is the most promising conducting polymer due to its environmental stability and adequate level of conductivity. The latest progress on the fabrication of polyaniline and its blends has attracted an enormous industrial interests. Composites and blends of polyaniline with several conventional plastics for use in plastic battery, antistatic coating, electromagnetic shielding, artificial muscle, corrosion protection, microwave absorption, aerospace and related purposes have been produced and displayed by various industries.View full abstractDownload PDF (5823K) -
Kiyoshi Endo2007 Volume 80 Issue 5 Pages 191-196
Published: May 15, 2007
Released on J-STAGE: March 12, 2010
JOURNAL FREE ACCESSThis review describes thermal polymerization of cyclic disulfides without any initiators. Cyclic disulfides such as 1, 2-dithiane (DT) and 1, 4-dihydro-2, 3-benzodithine (XDS) can polymerize easily at reaction temperature of the melting points of the respective monomers to give a high molecular weight polymer determined by GPC. From the analyses of NMR and ESI-MS spectroscopies, the polymers obtained from the polymerization of cyclic disulfides were found to be a cyclic structure. Moreover, thermal and mechanical properties of the polymers, and decomposition behaviors of the polymers demonstrate that the polymers obtained from thermal polymerization of cyclic disulfides include a polycatenane structure. From polymerization of cyclic disulfides in the presence of cyclic poly (ethylene oxide), a polycatenane consisting of two different cyclic polymer was obtained. The polymers revealed characteristics as a shape-memory material.View full abstractDownload PDF (7920K) -
2. Design of Functional Materials using Siloxane-containing CompoundsYusuke KAWAKAMI2007 Volume 80 Issue 5 Pages 197-202
Published: May 15, 2007
Released on J-STAGE: March 12, 2010
JOURNAL FREE ACCESSDesign of gas permeable membrane, liquid crystalline, surface-active, and holographic grating materials are described. The designs are based on the characteristic reactions and properties of the siloxane-containing compounds.View full abstractDownload PDF (8238K)
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