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Predecessor
Volume 49, Issue 10
Displaying 1-5 of 5 articles from this issue
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Etsuo KOKUFUTA, Seiichi KOKUBO, Shinji IWAI1976 Volume 49 Issue 10 Pages 589-594
Published: October 20, 1976
Released on J-STAGE: November 20, 2012
JOURNAL FREE ACCESSElectrophoretic mobilities and viscosities of poly (N, N-dimethyl diallyl ammonium chloride) (PDDA) were measured in the pH range of 3-10, using buffer solutions at the ionic strengths, μ of 0.02-1.0. The dependences of the limiting mobilities (Uc→o) and intrinsic viscosities ([η]) on μ (at pH 7.0) and pH (at μ 0.05, 0.1, and 0.2), and the dependence of [η] on Uc→o expressed by, μ or pH were investigated. The results are as follows :
(1) Uc→o and [η] decrease monotonically with increasing μ.
(2) Uc→o, and [η] are almost independent of pH where it is smaller than 5 and larger than 7, but decrease with increasing pH where it is from 5 to 7.
(3) The plots of [η] vs. Uc→o are straight lines passing through the origin at μ≥0.1.
On the basis of the above-mentioned results, the effects of μ and pH on the charge and conformation of PDDA inn are estimated.View full abstractDownload PDF (677K) -
Minoru TSUBOTA, Masato KATO, Katsuaki SONODA, Kenji UEKI1976 Volume 49 Issue 10 Pages 595-599
Published: October 20, 1976
Released on J-STAGE: November 20, 2012
JOURNAL FREE ACCESSThe experiments were carried out to reveal the merits of blending latices with water soluble resin in water base coatings. The samples were prepared in blending various acrylic latices with water soluble alkyd and melamine resin. The properties of these coating films were evaluated by stress-strain properties, dynamic viscoelasticities and degree of swelling. The results are as follows,
(1) In the case of blending of acrylic latices and water soluble alkyd resin, practical merits compared with the each component alone were not obtained. However, increase in gloss was observed.
(2) In the case of blending of acrylic latices and water soluble resin, reactivity of the acrylic latices influenced the dynamic viscoelasticities, glass transition temperatures and the degree of swelling of the baked coating films, but scarcely influenced the practical properties such as conventional paint test items and stress-strain curves.
(3) For acrylic coatings, type of polymer whether latices or solutions influenced neither the crosslinking mechanism nor the practical properties of the coating films. It is thought that there is no difference between types of polymer in the behavior and the efficiency of crosslinking of polymer molecules in the baking process.View full abstractDownload PDF (600K) -
Influence of Soybean, Linseed and Japanese Tung Oils AddedToshiko KENJO, Kazuyuki MIHARA1976 Volume 49 Issue 10 Pages 600-604
Published: October 20, 1976
Released on J-STAGE: November 20, 2012
JOURNAL FREE ACCESSThe hardening process of films of Japanese lacquer admixed with soy bean oil, linseed oil and tung oil respectively was investigated and the changes in properties of the films observed during their hardening were evaluated by comparing them with those of the Japanese lacquer films admixed with methyl oleate, linoleate and linoleate which had been previously reported.
The results obtained were as follows.
(1) The existence of hydrogen bonding between the catecholic hydroxyl group of urushiol and the carbonyl group of the oil added was proved, as in the case of the mixtures of Japanese lacquer and the methyl esters.
(2) The IR absorption band at 1,160 cm-1 (>C-0-R) of the oil shifted to 1,185 cm-1 when admixed with Japanese lacquer. In the lacquer film containing soy bean oil, the 1,185 cm-1 band remained unchanged even after hardening irrespective to the amount of the oil added.
In the case of linseed oil added, however, after hardening, there were a strong absorption band at 1,215 cm-1 with 10% of the oil added, two absorption bands of almost the same intensity both at 1,160 cm-1 and 1,215 cm-1 with 20% of the oil added, and a strong band at 1,160 cm-1 and a weak band at 1,215 cm-1 with 40% of the oil added. In the case of tung oil, there were the only absorption band at 1,215 cm-1 both with 10 and 20% of the oil added, and the only absorption band at 1,160 cm-1 (attributed to the oil) with 40% of the oil added.
(3) The absorption bands at 1,185 cm-1 (initially) and 1,215 cm-1 (after hardening) being observed in the Japanese lacquer had shifted towards the less wave number side when admixed with the methyl esters of unsaturated fatty acides and particularly a definite relation had been established between the value in the wave number shifted from 1,215 cm-1 and the amount of the ester added. In the present system, however, of the mixtures of Japanese lacquer and the oils, such a relation was not found.
(4) Among the three oils used, linseed oil made the Japanese lacquer film more lustrous without affecting the hardening and other properties of the film.View full abstractDownload PDF (569K) -
Influence of Oil-modified Resins on the Hardening of Lacquer FilmsToshiko KENJO, Kazuyuki MIHARA1976 Volume 49 Issue 10 Pages 605-611
Published: October 20, 1976
Released on J-STAGE: November 20, 2012
JOURNAL FREE ACCESSJapanese lacquer films admixed with several alkyd resins which had been modified with castor, coconut, soybean, dehydrated castor, safflower and linseed oils respectively were studied, and the following respecting results were obtained.
(1) Although the addition of alkyd resins, in general, markedly retarded the drying of Japanese lacquer, there were very interesting facts that the lacquer admixed with non-drying-oil-or semi-drying-oil-modified alkyd resins dried faster than one admixed with drying-oil-modified alkyd resins.
(2) Dynamic Young's modulus of Japanese lacquer generally lowered upon the addition of oilmodified alkyd resins except for the addition of 20% of soybean-oil-modified (oil length 80%) alkyd resin which exhibited almost the same modulus as Japanese lacquer alone. The addition of each of the alkyd resins lowered Tg Japanese lacquer by about 30°C.
(3) DTA of the film of Japanese lacquer alone showed four peaks of exotherm at 50 (A), 125 (B), 280 (C) and 390°C (D) respectively, and one peak of endotherm at 440°C (E). It was found from DTG that the lacquer film most severely decomposed by oxidation at 390°C. Upon the addition of oil-modified alkyd resins, the exotherm at peak C was greater than that of Japanese lacquer alone and peak D was different from that of Japanese lacquer alone.
The results of DTG generally showed that severe decomposition by oxidation occurred at about 420°C with only one exception of the case of safflower-oil-modified alkyd resin which exhibited a different shape of DTG curve.
IR spectra of films remained at 100,145,285,390 and 600°C respectively were measured, and from the results obtained several chemical changes in the films induced by heating were also discussed.View full abstractDownload PDF (643K) -
Shigezo TOCHIHARA1976 Volume 49 Issue 10 Pages 612-625
Published: October 20, 1976
Released on J-STAGE: November 20, 2012
JOURNAL FREE ACCESSDownload PDF (2432K)
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