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Predecessor
Volume 79, Issue 4
Displaying 1-7 of 7 articles from this issue
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Michiko HADANO, Tomohiro YAMAGUCHI, Hideyuki OTSUKA, Keigo AOI, Sono S ...2006 Volume 79 Issue 4 Pages 219-224
Published: April 15, 2006
Released on J-STAGE: March 12, 2010
JOURNAL FREE ACCESSBiodegradable segmented poly(urethanerea)s (SPUU's) were synthesized by a standard two-step prepolymer method using lysine-based diisocyanete and polycaprolactone diol (PCL) as a soft segment combined with 1, 4-butanediamine (BDA) as a hard segment. Thermal analysis by differential scanning calorimetry, wide angle X-ray diffraction (WAXD), and small angle X-ray scattering measurements revealed that the relative ratio of PCL and BDA segments in SPUU changed the crystallinity of PCL segment and the microphase separation structure consisted with soft and hard segments. Diffraction pattern in WAXD due to the crystal of PCL components disappeared in the case of SPUU containing 71% of PCL segment. Furthermore, the SPUU with 71% PCL segment showed good elastic properties because the crystallization of PCL component was completely inhibited by the strong aggregation of hard segments. BOD biodegradation test was performed by dipping SPUU into activated sludge for 30 days. Higher degradation rate was observed in the SPUU with higher enntent of PCT segment.View full abstractDownload PDF (6396K) -
Katsunon TANAKA, Ichiro KAGEYAMA2006 Volume 79 Issue 4 Pages 225-230
Published: April 15, 2006
Released on J-STAGE: March 12, 2010
JOURNAL FREE ACCESSVehicle dynamics and tire mechanics have been independently researched in each area. Therefore, the relation-ship between vehicle performances and tire design parameters has not been theoretically constructed. This study has built up a tire design methodology, based on the vehicle dynamics and the tire mechanics. The developed tire design methodology can clarify the relation between vehicle performances, tire characteristics, tire components, and tire design parameters, and is found useful.View full abstractDownload PDF (4050K) -
Akihirko SASAGAWA2006 Volume 79 Issue 4 Pages 231-236
Published: April 15, 2006
Released on J-STAGE: March 12, 2010
JOURNAL FREE ACCESSUntil recently, the factor that has played a predominant role in food processing was not “pressure” but “heat”, although both factors are independently responsible for transforming the state of a substance. In food processing, high-pressure treatment produces no aberrant matter that puts the safety of food at risk because the food processing can be achieved without any cleavage of covalent bond contained in the ingredients of food. Moreover, high-pressure treatment is considered to be very promising for food processing of the future. This is because decomposition of nutrients and production of stench can be minimized more effectively and energy consumption can be reduced more efficiently when compared with heat treatment. Further, when a food product in a container is subjected to high-pressure treatment, uniform processing throughout the food can be guaranteed. It has been confirmed that pressure treatment exhibits the following effects, which are useful to improve the quality of food to create new added value. 1) Removal of air bubbles 2) Impregnation of a sold substance. 3) Control of enzyme reaction and destruction of cell wall and cell membrane. 4) Denaturation of starch. 5) Bactericidal effect of high pressure treatment.View full abstractDownload PDF (12224K) -
Takahiro Seki, Shusaku Nagano2006 Volume 79 Issue 4 Pages 237-243
Published: April 15, 2006
Released on J-STAGE: March 12, 2010
JOURNAL FREE ACCESSBlockcopolymers provide regular nanoscale microphase separation structures whose pattern size ranges typically several tens nanometers. How to control these structures and patterns is of particular importance from technological viewpoints because top-down (photolithography etc.) and bottom-up supramolecular assembly approaches typically do not reach such feature size. The features of microphase separation structure depend on the architecture of the blockcopolymer, and thus almost all efforts are devoted to syntheses. We introduce in this review article our recent research activities to realize the photocontrol of structures and orientations of the microphase separation in blockcopolymers. Blockcopolymers possessing a photoresponsive azobenzene moiety are newly synthesized and spread on water or spincast as ultrathin films. In such two dimensionally constrained environments, effective controls of microdomain shape and orientation of nanocylinders are performed.View full abstractDownload PDF (12013K) -
Teiji KOHARA2006 Volume 79 Issue 4 Pages 244-249
Published: April 15, 2006
Released on J-STAGE: March 12, 2010
JOURNAL FREE ACCESSThe amorphous cyclo-olefin polymer has been developed for optical uses. ZEON's cyclo-olefin polymer (it is abbreviated as COP) which consist of hydrocarbon shows good transparency, low birefringence, high heat-resistance, very low water absorbency and good moldability. COP has widely been used as a material for optical components such as optical lenses, prisms, optical cells for the analysis, optical films, light guide pates, light diffusers for LCD.
The change of the refractive index of COP is small even in under high humidity and high temperature conditions so that the changes in spherical aberration of COP lense are very small. They demonstrate high reliability.
For the DVD pickup lens, we successfully developed the new cyclo-olefin polymer which is more excellent in the blue laser resistance than the conventional cyclo-olefin polymer.
In this paper, besides optical applications, characteristics of the cyclo-olefin polymer as high frequency insulating material are also introduced.View full abstractDownload PDF (11864K) -
Shin-ichi KIMURA2006 Volume 79 Issue 4 Pages 250-256
Published: April 15, 2006
Released on J-STAGE: March 12, 2010
JOURNAL FREE ACCESSPolymeric materials are used in various applications. The analysis of surface has an important role in characterizing the surface composition and structure in relation to the surface properties. And it is also important in case of making clear the cause of defects and irregularities which appeared on the surfaces.
The recent progress in the surface analysis of polymers will be explained in this course, which has three parts. This article is the first part. In this first part, author describes about the outline of the applications of the commercialized instruments for surface chemical analysis and profile measurements to polymer surfaces.View full abstractDownload PDF (3041K) -
Yoshiaki Zama2006 Volume 79 Issue 4 Pages 257-260
Published: April 15, 2006
Released on J-STAGE: March 12, 2010
JOURNAL FREE ACCESSDownload PDF (2954K)
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