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Predecessor
Volume 81, Issue 1
Displaying 1-10 of 10 articles from this issue
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[in Japanese]2008 Volume 81 Issue 1 Pages 1
Published: January 15, 2008
Released on J-STAGE: March 25, 2010
JOURNAL FREE ACCESSDownload PDF (2788K) -
[in Japanese]2008 Volume 81 Issue 1 Pages 2
Published: January 15, 2008
Released on J-STAGE: March 25, 2010
JOURNAL FREE ACCESSDownload PDF (1854K) -
Naoko MATSUZAKA, Hiroaki KONDO, Tomoko WATANABE, Yoshito OHTAKE2008 Volume 81 Issue 1 Pages 3-7
Published: January 15, 2008
Released on J-STAGE: March 25, 2010
JOURNAL FREE ACCESSThermal degradation effect on the thermal conductivity of vulcanized natural rubber (NR) was investigated. Thermal conductivity of NR sheet of 2 mm thickness measured by laser-flash method decreased with the progress of thermo-oxidative degradation regardless of the carbon black content. Therefore, thermal conductivity measurement can be used as a new evaluation method of thermo-oxidative degradation.
Furthermore, thermal diffusivity of thin films of 200μm thickness taken out from NR sheet were measured by temperature wave analysis. It was revealed that pure NR sheet uniformly softened under the situation of thermo-oxidative degradation, whereas the surface of carbon black-filled NR sheet hardened and the inside of carbon black-filled NR sheet softened with thermo-oxidative degradation. Thus, the measurement of thermal conductivity of sheet NR and thermal diffusivity of thin film NR revealed that the carbon black influences the mechanism of thermo-oxidative degradation of vulcanized NR, and particularly on carbon filled NR, the process of thermo-oxidative degradation is different between the surface and the inside of sheet NR of thickness 2mm.View full abstractDownload PDF (892K) -
Kazuhisa TAKAGI, Hidetoshi HIRAHARA, Katsuhito MORI, Eiichi NARITA, Yo ...2008 Volume 81 Issue 1 Pages 8-13
Published: January 15, 2008
Released on J-STAGE: March 25, 2010
JOURNAL FREE ACCESSA new concept has been proposed for adhesion theory and technology, unifying various adhesion theories and simplifying adhesion technology. This purpose is achieved by using a molecular adhesive, 6-(3-triethoxysilylpropy-lamino)-1, 3, 5-triazine-2, 4-dithiol (TES), which contains two functional groups of dithiol triazinyl and alkoxysilyl groups in one molecule. Resins such as epoxy resin, polyamide, and polyester were pretreated by corona discharge to form OH groups on the surfaces. The OH groups react readily with TES by heating for 10min at 150°C to give TES containing resin surfaces. Silicone rubber adhered readily to the TES containing resin surfaces by hot-pressing for 10min at 160°C, with very high peel strength which is destroyed in rubber-phase. Peel strength decreased with surface roughness on resins, and the amount of TES decreased with the roughness.View full abstractDownload PDF (7268K) -
Satoshi MIWA, Hiroaki KONDO, Hiroyuki ONTSUKA, Yoshito OHTAKE2008 Volume 81 Issue 1 Pages 14-18
Published: January 15, 2008
Released on J-STAGE: March 25, 2010
JOURNAL FREE ACCESSThe degradation behavior of vulcanized EPDM in ozone water (O3(aq)) or ozone/chlorine water (O3/Cl2(aq)) was investigated and characterized by ATR-FT-IR, GPC, and EPMA analysis.
The superficial layer of vulcanized EPDM was observed to be disrupted due to oxidative shortening of EPDM polymer chains by O3(aq) or O3/Cl2(aq) Furthermore, EPDM treated in O3/Cl2(aq) contained a higher proportion of decomposition products than that treated in O3/Cl2(aq). This may be a result of the synergetic effect on acceleration of oxidation by chlorine and reaction with radical oxygen generated from O3/Cl2(aq).
As an additional experiment, degradation behavior of carbon black- and silica-compounded EPDM's in O3/Cl2(aq) was investigated. In this case, the latter material was less damaged by oxidation than the former one.View full abstractDownload PDF (10258K) -
Noriaki Wada2008 Volume 81 Issue 1 Pages 19-22
Published: January 15, 2008
Released on J-STAGE: March 25, 2010
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Masahiro FUJITA, Yoshiharu DOI2008 Volume 81 Issue 1 Pages 23-28
Published: January 15, 2008
Released on J-STAGE: March 25, 2010
JOURNAL FREE ACCESSPoly[(R)-3-hydroxybutyrate] (P(3HB)) and its copolymers, produced by various microorganisms as an intracellular carbon and energy reserve, are biodegradable thermoplastic materials. These polymers are thus expected as a new material for a solution to problems concerning global environment. For the biodegradable polymer materials, the crystalline regions in the material play an important role in the regulation of both the degradability and the physical properties. Toward developing the high-performance biodegradable materials with desirable physical properties, we aim to reveal the morphology of crystalline region and its transformation by external field such as stress or heat at a molecular level. Here, we discuss the real-time annealing experiments of P(3HB) and its copolymer solution-grown single crystals, followed by synchrotron radiation small-angle X-ray scattering and wide-angle X-ray diffraction. The solid state reorganization of crystal thickening is attributed to partial melting-recrystallization process via the mutual rearrangement of molecular chains, which are released from the crystal lattice, between the adjacent crystals.View full abstractDownload PDF (10709K) -
Kiyoshi ENDO, Yoshikatsu TSUCHIYA2008 Volume 81 Issue 1 Pages 29-34
Published: January 15, 2008
Released on J-STAGE: March 25, 2010
JOURNAL FREE ACCESSThis review deals with the recent development of the polymerization of vinyl chloride (VC) from the point of controlled synthesis of the polymer. After the features and issues of radical polymerization of VC are described, we focused on the controlled synthesis of poly (vinyl chloride) (PVC) with living radical polymerization, anionic polymerization and transition metal catalyzed polymerization. The polymerization of VC with alkyllithium (RLi) especially tertbutyllithium was able to achieve the control of main chain structure and molecular weight of the polymer. In the polymerization of VC with half-titanocene/methylaluminoxane (MAO) catalysts, the ligand effect of the half-titanocenes was observed. The half-titanocenes containing electrodonating ligand such as Cp*Ti (OPh)3/MAO were found to be favored for promoting the controlled polymerization. The PVC without anomalous units obtained with RLi and the half-titanocene complexes revealed more thermally stable than that obtained with radical initiators. Advanced PVC is expected to be produced by developing these controlled polymerizations.View full abstractDownload PDF (4373K) -
Ken Nakajima2008 Volume 81 Issue 1 Pages 35-36
Published: January 15, 2008
Released on J-STAGE: March 25, 2010
JOURNAL FREE ACCESSDownload PDF (3133K) -
[in Japanese]2008 Volume 81 Issue 1 Pages 37-38
Published: January 15, 2008
Released on J-STAGE: March 25, 2010
JOURNAL FREE ACCESSDownload PDF (3269K)
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