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Volume 39, Issue 11
Displaying 1-16 of 16 articles from this issue
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Materials for Vascular ProsthesesYASUHARU NOISHIKI1983 Volume 39 Issue 11 Pages P399-P404
Published: November 10, 1983
Released on J-STAGE: November 28, 2008
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KENJI INAGAKI1983 Volume 39 Issue 11 Pages P405-P410
Published: November 10, 1983
Released on J-STAGE: November 28, 2008
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MASAKI MIYAMOTO, SHIGERU SASAKAWA1983 Volume 39 Issue 11 Pages P411-P420
Published: November 10, 1983
Released on J-STAGE: November 28, 2008
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AIZO YAMAUCHI, HISAO ICHIJO1983 Volume 39 Issue 11 Pages P421-P426
Published: November 10, 1983
Released on J-STAGE: November 28, 2008
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TERUO MIYATA1983 Volume 39 Issue 11 Pages P427-P435
Published: November 10, 1983
Released on J-STAGE: November 28, 2008
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AKIHIRO ISOBE1983 Volume 39 Issue 11 Pages P436-P444
Published: November 10, 1983
Released on J-STAGE: November 28, 2008
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Jiro Shimizu, Norimasa Okui1983 Volume 39 Issue 11 Pages T445-T450
Published: November 10, 1983
Released on J-STAGE: November 28, 2008
JOURNAL FREE ACCESSMeasurements of spinning stress on filaments and birefringence of filaments in high speed melt spinning are reported. The air drag and the inertia contributions to the spinning stress are dominant factors in high speed spinning. The inertial stress plays an important role in the formation of fiber structure, since the air drag causes small effect on its formation. Linear relationships between the inertial stress and the birefringence of fibers were found in many polymers, namely, polyesters, polyolefins and nylons. The extent of slopes in such linear relations is associated with the crystallization mechanisms and the resulting fiber morphology.View full abstractDownload PDF (311K) -
Yong Sung Jo, Shigeru Tasaka, Seizo Miyata1983 Volume 39 Issue 11 Pages T451-T455
Published: November 10, 1983
Released on J-STAGE: November 28, 2008
JOURNAL FREE ACCESSIn amorphous copolymer of vinylidene cyanide and vinyl acetate showing high piezoelectricity, a considerable enthalpy relaxation was observed at the glass transition temperature (Tg) by annealing below Tg. The relationships between the excess thermodynamic properties and the piezoelectric properties were elucidated by investigating the effect of isothermal annealing on the depolarization process by the thermal stimulated current (TSC) measurements. From the comparison of activation energies between the enthalpy relaxation and the depolarizing process, the molecular motion associated with the energy absorption in DSC endothermic peak is considered to be the conformational rearrangement of C-CN bond induced by dipole rotations in the glassy matrix. Also corresponding changes in molecular mobility have an influence upon the stability of dipole orientation in depolarizing process. Consequently, annealing below Tg increases the stability of the remanent polarization (Pr) and its corresponding piezoelectricity.View full abstractDownload PDF (286K) -
Shigeru Tasaka, Katsumi Shiraishi, Kazutomo Murakami, Seizo Miyata1983 Volume 39 Issue 11 Pages T456-T460
Published: November 10, 1983
Released on J-STAGE: November 28, 2008
JOURNAL FREE ACCESSPiezoelectric properties of Poly (vinylidene fluoride) films in stretched, annealed and poled states were investigated in terms of function of annealing conditions. With increasing the annealing temperature, a lattice spacing, d (110, 200), in form I crystal decreases and the crystallinity increases;
however, the dipole orientation induced by the field becomes imperfect. Consequently, for the roughly packed crystal, it could be expected that poling would facilitate the dipole orientation.
From the above result, the new method of electret preparation in PVDF and its related copolymer is proposed. This method, which consists of simultaneous drawing and poling, can apply the field to necking zone where the transition of form II to form I occurs. The sample with unstable crystal structure can easily be modified to have strong piezoelectric constant (d31_??_40pC/N) by this method.View full abstractDownload PDF (327K) -
Tatsuko Hatakeyama, Hyoe Hatakeyama1983 Volume 39 Issue 11 Pages T461-T466
Published: November 10, 1983
Released on J-STAGE: November 28, 2008
JOURNAL FREE ACCESSThe effect of water on the glass transition and the cold-crystallization of amrophous poly (ethylene terephtalate) (PET) was studied by differential scanning calorimetry. The glass transition temperature (Tg) of PET shifted 6-7K to the low temperature side in the presence of 1% water. At the same time, a sub-Tg was newly observed at temperature 10K lower than Tg. The starting temperature of the cold crystallization also decreased with increasing water content. The non-freezing water content was evaluated from the enthalpy of melting of water contained in PET. The amount of non-freezing water was small (0.5-1.0%), when it was compared with that of polymers having the hydrophilic group examined as a reference. However, this small amount of non-freezing water markedly induces the molecular rearrangement of PET.View full abstractDownload PDF (383K) -
Takatoshi Kinoshita, Eiji Kawanishi, Akira Takizawa, Yoshiharu Tsujita1983 Volume 39 Issue 11 Pages T467-T474
Published: November 10, 1983
Released on J-STAGE: November 28, 2008
JOURNAL FREE ACCESSThree types of membranes of poly (γ-methyl D-glutamate) (PMDG), membrane A, B and C, were cast from 2% PMDG-ethylene dichloride solution under the different conditions. The membrane A was obtained by vacuum drying of the solution at 25°C for about 2 hrs. The membrane B and C were prepared by air-drying of the solution at 25°C for 3 days and 30 days, respectively. Sorption behaviors of these membranes could be described well by a dual sorption model which have been used effectively for gas-glassy polymer systems. The temperature dependence of Henry's law sorption parameter, kD, of membrane B and C had an inflection point at the second order transition temperature of the side chain. On the other hand, kD of membrane A linearly increased with increasing temperature. The Langmuir capacity term, C′H, of membrane A was considerably larger than those of B and C. The permeation behavior of membrane A involved the convectional flow, i.e., the permeability coefficient of CO2 through membrane A linearly increased with increasing upstream pressure. On the other hand, the permeation behaviors of membrane B and C could be interpreted by the dual mobility model. As a result, separate diffusion coefficients of CO2 for Henry's law and Langmuir modes, DD and DH, were estimated. It was found that the diffusivity for the Langmuir mode gas in the membranes was relatively high, DH/DD being almost equal to unity. All of these results were ascribed to the difference of the packing state of the α-helix chains in these membranes, which was caused by the different membrane preparation.View full abstractDownload PDF (1073K) -
Yoshiharu Tsujita, Hitoshi Nakahara, Ryoji Nishizima, Akira Takizawa1983 Volume 39 Issue 11 Pages T475-T478
Published: November 10, 1983
Released on J-STAGE: November 28, 2008
JOURNAL FREE ACCESSA dielectric study on a solution of copoly(ethyl-L-aspartate-benzyl-L-aspartate)s with various compositions synthesized by ethylation of poly (β-benzyl-L-aspartate) was performed and dielectric constants were obtained as a function of temperature and frequency. A dielectric dispersion attributable to rotation of the α-helix was observed for all the copolyaspartates. Static dielectric constants were estimated by Cole-Cole plots and the dipole moment of the copolyaspartate was evaluated by the aid of the Barriol-Weissbecker and Applequist-Mahr equations. There was no abrupt change in the dipole moment at the transition point of the helix sense from the right- to left-handed α helix, indicative of the absence of both random coil conformation and an equimolar mixture of the rightand left-handed α helical residues in a chain at the transition point.View full abstractDownload PDF (270K) -
Kiyoshi Ishii, Satoru Oka1983 Volume 39 Issue 11 Pages T479-T484
Published: November 10, 1983
Released on J-STAGE: November 28, 2008
JOURNAL FREE ACCESSIn order to introduce micro-voids into Chinon fiber, which is composed mainly of milkcaseinacrylonitrile graft copolymer, the treatments with some proteases, i.e., Pronase P, Papain C-400 and Proteoliquifase were studied. Although Chinon fiber was practically resistant to proteolysis, more than 50% of milkcasein was digested when the fiber was preliminarily treated with acid, such as phosphoric acid, sulfuric acid or formic acid. Thus, the proteolytic elimination of the protein resulted in an introduction of micro-voids of a total volume up to 0.13cm3/g into the fiber, though the shape and volume of the introduced micro-voids varied depending on the enzymes employed.View full abstractDownload PDF (687K) -
Zenzo Morita, Isao Nishikawa, Hiromi Motomura1983 Volume 39 Issue 11 Pages T485-T492
Published: November 10, 1983
Released on J-STAGE: November 28, 2008
JOURNAL FREE ACCESSThe pseudofirst-order rate constants, kcell, of the reaction with cellulose for five dichlorotriazinyl reactive dyes were measured at 30°C by the method of cylindrical film roll. The ratio, P(=kw/kcell), of the pseudofirst-order rate constant, kw, of the hydrolysis in cellulose to the kcell was examined by two methods. The log kcell versus pH plots were similar to those for the hydrolysis measured by Ingamells et al. They were linear below pH 10 and fell off at about pH 10 except for C. I. Reactive Red 1 and Red 2. The diffusion coefficients of the active and hydrolyzed species were constant over the pH range 7-12. The diffusion and reaction behaviors were exceptional for Orange 1, Red 1 and Red 2 among the dichlorotriazinyl dyes. Namely, the hydrolysis of Orange 1 in cellulose was very fast at high pH, and Red 1 and Red 2 had a large diffusion coefficient in spite of the moderate adsorptivity and showed a particular pH-dependence of log kcell. The value of P, in general, decreased with the increase in ionic strength and increased with the increase in pH, though it varied with dyes.View full abstractDownload PDF (474K) -
Kensuke Sakurai, Junichi Fujimoto, Tokiyoshi Shibano, Toshisada Takaha ...1983 Volume 39 Issue 11 Pages T493-T495
Published: November 10, 1983
Released on J-STAGE: November 28, 2008
JOURNAL FREE ACCESSChitosan membranes were prepared by various methods of casting from solution. The permeabilities of CO2 and O2 gases strongly depended on the preparation methods of membranes. Relation between the permeability and the structure of membrane was discussed.View full abstractDownload PDF (176K) -
Shigeo Hirose, Hyoe Hatakeyama, Tatsuko Hatakeyama1983 Volume 39 Issue 11 Pages T496-T500
Published: November 10, 1983
Released on J-STAGE: November 28, 2008
JOURNAL FREE ACCESSA series of polyacylhydrazones having the following structure was synthesized: The glass transition temperatures (Tg's) of the polymers decreased with the increase of m numbers in -(CH2)m-among polymers having the same R. The polymers having the m-phenylene group showed higher Tg's than those having the tetramethylene group if the m number in the -(CH2)m-group was the same.View full abstractDownload PDF (251K)
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