All issues
Successor
Volume 36, Issue 12
Displaying 1-13 of 13 articles from this issue
- |<
- <
- 1
- >
- >|
-
YOSHIO YANO1980 Volume 36 Issue 12 Pages P485-P489
Published: December 10, 1980
Released on J-STAGE: November 28, 2008
JOURNAL FREE ACCESSDownload PDF (314K) -
NOBUO NAKABAYASHI1980 Volume 36 Issue 12 Pages P490-P495
Published: December 10, 1980
Released on J-STAGE: November 28, 2008
JOURNAL FREE ACCESSDownload PDF (467K) -
Status Quo and Problems of Adherence ChromatographyKENJI HONDA, MASAKI MIYAMOTO, SHIGERU SASAKAWA1980 Volume 36 Issue 12 Pages P496-P503
Published: December 10, 1980
Released on J-STAGE: November 28, 2008
JOURNAL FREE ACCESSDownload PDF (1137K) -
YASUHARU NOISHIKI1980 Volume 36 Issue 12 Pages P504-P509
Published: December 10, 1980
Released on J-STAGE: November 28, 2008
JOURNAL FREE ACCESSDownload PDF (3975K) -
HIROYOSHI KOBAYASHI1980 Volume 36 Issue 12 Pages P510-P516
Published: December 10, 1980
Released on J-STAGE: November 28, 2008
JOURNAL FREE ACCESSDownload PDF (3025K) -
TAKUMA OBA1980 Volume 36 Issue 12 Pages P517-P521
Published: December 10, 1980
Released on J-STAGE: November 28, 2008
JOURNAL FREE ACCESSDownload PDF (385K) -
Nobuya Kuroda1980 Volume 36 Issue 12 Pages T527-T534
Published: December 10, 1980
Released on J-STAGE: November 28, 2008
JOURNAL FREE ACCESSThe relation between the permeability coefficients of some gases and the internal fine structure of polyester films has been studied on samples of the films stretched uniaxially under constant width. The permeability coefficients of He, 02 and N2 for variously stretched films were determined by an apparatus based on the low vacuum method. The internal fine structure of the films was discussed from the wide angle X-ray diffraction pattern, dynamic moduli determined in the stretched and the transversal directions and some other physical properties.
The permeability coefficients, Pa, of the amorphous region of the polymer were calculated for the gases based on the structural model described in a previous paper. The coefficients for O2 and N2 decreased monotonically with increasing stretching ratio, but the coefficient for He showed a maximum at a low stretching ratio.
The variations of Pa with stretching ratio were explained in illustrated terms of the number of possible conformations of chain molecules in the amorphous region of the uniaxially stretched polymer.
The relations between Pa and the dynamic modulus of the film showed some deviation from those found for other films. However the relation for the dynamic modulus in transversal direction to stretching showed a trend concomitant with other films below Tg of the films. The permeability coefficients at a given dynamic modulus increased with increasing the stretching ratio of the film.
In summary, the permeability coefficients for O2 and N2 were strongly affected by the number of possible conformations of the chain molecule in the amorphous region of the polymer. However, the effect to He was not so evident probably because of the contribution of some other mechanisms to the permeation.
For the uniaxially stretched polyester films, little correlation was found between the segmental motion of the chain molecule that contributes to the mechanical properties and the motion that contributes to the permeation of gases.View full abstractDownload PDF (1310K) -
Hiromasa Suzuki, Yoshishige Tanada, Yoshiji Ishii1980 Volume 36 Issue 12 Pages T535-T540
Published: December 10, 1980
Released on J-STAGE: November 28, 2008
JOURNAL FREE ACCESSThe photofading rate of Astrazon Orange G in a dioxane-ethanol mixture has been studied in the presence of polymers having certain ultraviolet absorption groups, o-hydroxybenzophenone (HBP) and phenyl benzoate (PB) (polymer K and polymer E respectively).
Polymer K and HBP show emission maxima at 495 and 470 nm, respectively and Astrazon Orange G has λmax, at 503 nm. Therefore, it is expected that energy transfer from such ultraviolet absorbers to Astrazon Orange G may occur, and hence the absorbers act as an accelerator on the photofading rate of the dye.
The effects of the absorbers, found by the rate measurements, are summarized as follows:
(1) Polymer K and HBP act as retarder, while polymer E and PB act as accelerator.
(2) The energy transfer from HBP group to the dye does not occur; Stern-Volmer plot (Fig. 9) shows that HBP group acts as quencher.View full abstractDownload PDF (355K) -
Shinji Ogasawara, Yoshio Amari, Shigetaka Kuroiwa1980 Volume 36 Issue 12 Pages T541-T547
Published: December 10, 1980
Released on J-STAGE: November 28, 2008
JOURNAL FREE ACCESSIn a previous report, the diffusion of monoazo acid dyes, Orange II (C. I. Acid Orange 7) and Diacid Supra Red 3B (C. I. Acid Red 35), in nylon 6 films containing various amounts of tannic acid was measured by the film roll method, and the mechanism of the improvement in the wet fastness of acid dyes on nylon by aftertreatment with tannic acid was investigated. From the results obtained by the diffusion measurement, it was deduced that the improvement might be attributed to the lowering of the rate of diffusion of the dyes due to the electrostatic repulsion between the dye and tannic acid and the filling up of pores in nylon by tannic acid. However, since the dye bath used for dyeing film rolls consisted of an aqueous solution of dye alone and had no buffer effect, the effects of tannic acid could not be discussed in detail.
In the present report, in order to investigate the effects of tannic acid in more detail, the diffusion measurements for the same dyes were carried out in dye baths of various pH's adjusted with 0.1 mol/1 acetate buffer solution.
The information obtained from the pH dependences of the diffusion profiles leads to the following speculation; whether the predominant type of dye diffusion is ionic or nonionic is determined principally by the basicity of dye anion and dissociation states of functional groups in dye and nylon. Furthermore, it is ascertained that the sorption and diffusion of the dyes in nylon are suppressed by the electrostatic repulsions between a dye anion and negative charges of dissociated phenolic hydroxyl groups of tannic acid. These electrostatic repulsions seem to be stronger for a dye having more sulfonic acid groups at higher pH's where the degree of dissociation of tannic acid increases.View full abstractDownload PDF (459K) -
Nobuo Ikuta, Joichi Koga, Nobuhiko Kuroki1980 Volume 36 Issue 12 Pages T548-T554
Published: December 10, 1980
Released on J-STAGE: November 28, 2008
JOURNAL FREE ACCESSThe acid-base equilibria of an optical probe, 5-N, N-dimethylaminonaphthalene-1-sulfonyl group, conjugated to amino end groups of undrawn and drawn nylon 6 films have been investigated by the change of fluorescence intensity in aqueous NaCI solutions. The behaviors of acid titration of the conjugated films which had been treated in different conditions to remove the unreacted probe were distinguishable. The apparent pK values of the conjugated probe decreased with decreasing pH and were held constant below pH 2 except in some cases of the treatments. In addition, these pK values were rather lower than that of the probe itself in aqueous solutions. These phenomena were accounted for by the difference in the electrostatic potential between nylon 6 film and bulk water. This view was supported by the fact that pK values in 0.5 M NaCl solution were larger than those in water or in 0.05 M NaCl solution.View full abstractDownload PDF (440K) -
Masataka Kurokawa, Yoshiaki Komoto, Kaoru Yamaki, Hideo Noshi, Mikio A ...1980 Volume 36 Issue 12 Pages T555-T559
Published: December 10, 1980
Released on J-STAGE: November 28, 2008
JOURNAL FREE ACCESSThe artificial blood vessel of 5mm I. D. compound-braided by using two ply yarns of polytetrafluoroethylene and collagen is designed and manufactured by circular braider.
The test tubes of about 50mm in length were implanted in the place of the right external iliac artery in line and in the right common carotid artery as an arteriovenous shunt to the right external jugular vein of an adult mongrel dog. Microknit tubes of 4mm I. D. and 50mm in length, polyester knitted vascular prostheses of Golaski Lab., Philadelphia, Pa., U.S.A., were implanted in the left side respectively as a control.
Bleeding through the tubes at implantation was found less in the new designed tubes than in the Microknits. The specimen obtained two days after implantation showed; 1) test tube implanted in the right external iliac artery was found thrombosed at the sites of anastomoses, and 2) the other one implanted in the right common carotid artery was found free from thrombus formation, whereas no thrombus formation in the Microknit grafts either in the external iliac or in the common carotid arteries.
Poor cuff formation and too much tension of the tube at implantation should be responsible for an early thrombus formation.View full abstractDownload PDF (1010K) -
Takuma Teshirogi, Hideo Yamamoto, Munenori Sakamoto, Hiroaki Tonami1980 Volume 36 Issue 12 Pages T560-T563
Published: December 10, 1980
Released on J-STAGE: November 28, 2008
JOURNAL FREE ACCESSAminodeoxycelluloses and 6-amino-6-deoxystarch were sulfated with N, N-dimethylformamide-sulfur trioxide complex in order to obtain heparin-like anticoagulant molecules. Sulfated products obtained had a degree of substitution (DS) by the sulfate group, ca. 1.0. I. r spectra showed that the chemical structures of sodium 6-amino-6-deoxycellulose sulfate, sodium 2-amino-2-deoxycellulose sulfate, and sodium 6-amino-6-deoxystarch sulfate were similar to that of sodium heparinate.View full abstractDownload PDF (214K) -
Nobuya Kuroda1980 Volume 36 Issue 12 Pages T564-T567
Published: December 10, 1980
Released on J-STAGE: November 28, 2008
JOURNAL FREE ACCESSThe permeability coefficients of gases were measured for the polyester films obtained by simultaneous biaxial stretching. The relation between the permeability coefficients of gases and the internal fine structure of polymer film was discussed.
The permeability coefficients decreased with increasing stretching ratio more drastically than the case of uniaxially stretched films, suggesting that the orientation or order of molecular chain in the biaxially stretched polymer film increased more than that of uniaxially stretched polymer film. The permeability coefficients, Pa, of gases in the amorphous region pf polymer were discussed along the same lines as given in our preceding report.View full abstractDownload PDF (282K)
- |<
- <
- 1
- >
- >|