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Volume 53, Issue 2
Displaying 1-6 of 6 articles from this issue
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Polymeric Complexes between Polyurethane Containing Phenylimino-Group in Main Chain and p-ChloranilNaonori OHNO, Ju KUMANOTANI1980 Volume 53 Issue 2 Pages 71-77
Published: February 20, 1980
Released on J-STAGE: November 20, 2012
JOURNAL FREE ACCESSThe effects of formations of electron-donor-acceptor (EDA) complex in polymeric materials upon mechanical properties were studied for the linear and network polyurethanes containing phenylimino-group as donor unit which were complexed with p-chloranil in a 14-17% yield of the theoretical amount based on the assumption of formation of complex whose composition is donor : acceptor =1 : 1. Dynamic mechanical measurements were performed with Vibron-II at 35, 11, 0. 1, and 0.01 Hz over the temperature range from-90 to 100°C. An increase in the glass transition temperature (Tg) by 3-4°C and in the modulus in the temperature region above Tg, and further an appearance of the α' dispersion above Tg with the activation energy of 8. 8 kcal/mole were found as a result of complexing of the polyurethanes. These were interpreted in terms of the increased intermolecular interaction or the aggregation due to the introduced EDA complex in polymers. From chemical stress relaxation measurements of the complexed or the original polymers, the complexed polymeric materials were found to be degraded more easily in comparison with the original polymers by a long time exposure (up to 100 hrs) to large stress (20% elongation) under a high temperature such as 100°C.View full abstractDownload PDF (754K) -
Akira TAKAMURA, Tomoko MINOWA, Shun'ichi NORO, Masumi KOISHI1980 Volume 53 Issue 2 Pages 78-83
Published: February 20, 1980
Released on J-STAGE: November 20, 2012
JOURNAL FREE ACCESSThe object of this paper is to examine the effects of dispersing and viscous agents on aqueous dispersion system of titanium dioxide.
The powder used was Al-modified rutile type titanium dioxide. Dispersing and viscous agents used were sodium metaphosphate and starch syrup, respectively. The particle size distribution was determined by the measurement of change of relative turbidity with sedimentation time under the influential field of centrifugal force. Furthermore, the electrophoretic mobility of suspensions prepared by various dispersing agent concentrations was evaluated with the moving boundary method.
Following results were obtained.
(1) Zeta potential for the suspension of titanium dioxide had negative maximum value of average-1.75 mV at the characteristic concentration of dispersing agent.
(2) Starch syrup as viscous agent did not alter the surrounding situation on surface of titanium dioxide particles, and then it has two effects. One effect is the increase of viscosity of continuous phase, and the other is the decrease of sedimentation velocity of particle in the suspended system.View full abstractDownload PDF (692K) -
Kanehiro HIGUCHI1980 Volume 53 Issue 2 Pages 84-90
Published: February 20, 1980
Released on J-STAGE: November 20, 2012
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Seiji SHIOZAKI1980 Volume 53 Issue 2 Pages 91-97
Published: February 20, 1980
Released on J-STAGE: November 20, 2012
JOURNAL FREE ACCESSDownload PDF (908K) -
Bunya TANI1980 Volume 53 Issue 2 Pages 98-106
Published: February 20, 1980
Released on J-STAGE: November 20, 2012
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Keizo OHTA1980 Volume 53 Issue 2 Pages 107-116
Published: February 20, 1980
Released on J-STAGE: November 20, 2012
JOURNAL FREE ACCESSDownload PDF (1064K)
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