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Predecessor
Volume 41, Issue 11
Displaying 1-9 of 9 articles from this issue
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Toshihide INOUE, Hideo KOMOTSU, Masana YANAGI1984 Volume 41 Issue 11 Pages 643-647
Published: November 25, 1984
Released on J-STAGE: February 26, 2010
JOURNAL FREE ACCESSThe mouldability of wholly aromatic crystalline polyester (polyarylate) synthesized from hydroquinone and isophthalic acid was very poor because of the high melting point and high melt viscosity.
However, the addition of triphenyl phosphate (TPPA) to the polyarylate effectively improved the mouldability, and the polyarylate could be melt-spun in the temperature range of 380-410°C without thermal decomposition.
The fibers showed an initial modulus of 65.2-79.5 g/d and had excellent thermal properties.View full abstractDownload PDF (660K) -
Mikio TAKESHIMA1984 Volume 41 Issue 11 Pages 649-656
Published: November 25, 1984
Released on J-STAGE: February 26, 2010
JOURNAL FREE ACCESSBurst impact tests were carried out to study the effects of impact velocity, film thickness and impact head shape on the burst impact properties of linear polymer films such as Polycarbonate (PC), Poly (vinyl chloride) (PVC), Poly (methyl methacrylate) (PMMA) and Polystylene (PS). PC film had a very large impact value and ductile type fracture mode. On the other hand, PMMA and PS films had very small impact values and brittle type fracture mode. PVC film showed the transition area from ductile type fracture mode to brittle type fracture mode in the impact velocity of 2-3 m/s. The maximum stress, Pb of films was small in ductile type fracture and large in brittle type fracture. The apparent average elongation percentage, εr of films was big in ductile type fracture and small in brittle type fracture. It was shown that mechanical loss peak (β transition), steric hindrance parameter (σ) and integrated loss tangent (L) were good parameters to estimate the burst impact properties of polymer films.View full abstractDownload PDF (1588K) -
Yoshiharu KIMURA, Norihiro SUGIHARA, Isoji TANIGUCHI1984 Volume 41 Issue 11 Pages 657-664
Published: November 25, 1984
Released on J-STAGE: March 25, 2010
JOURNAL FREE ACCESSCarboxyl functionalized poly (oxyethylenes) (PEO acid) with sharp molecular weight distribution at Mn=400, 1, 000, 3, 300, and 8, 400 were utilized as telechelic oligomers. They were reacted with piperazine (PZ) and hexamethylenediamine (HA) at 50-60°C to form the complex salts with a 1: 1 composition. The salts were then allowed to polymerize at 100°C with H2O eliminated. By the thermal copolycondensation of the salts with nylon 6, 6 salt various segment block copoly (amide-ethers) with high molecular weight were prepared in high yields. Here, the PEO sequence introduced in the copolymer can be adjustable by the feeding ratio of the both salts and by the selection of the molecular weight of the PEO acid. Chlorination of PEO acids by oxalyl chloride or thionyl chloride gave chlorocarbonyl functionalized poly (oxyethylenes) (PEO acid chloride), which can also be used as telechelic oligomers with high reactivity. They were also submitted to polycondensation and copolycondensation with various diamines in solution at a low temperature.View full abstractDownload PDF (1163K) -
Kazuta MITSUISHI, Hitoshi KAWASAKI, Soji KODAMA1984 Volume 41 Issue 11 Pages 665-672
Published: November 25, 1984
Released on J-STAGE: February 26, 2010
JOURNAL FREE ACCESSMechanical properties (breaking elongation) and efflux rate of polypropylene (PP) were improved by filling it by calcium carbonate treated with phosphate coupling agent. Improvement of mechanical properties (breaking elongation) and efflux rate was attributed to polymer-filler adhesion by means of the phosphate coupling agent phase causing the reduction of the stress concentration and lubricant at polymer-filler interface.
In the case of untreated calcium carbonate, relative modulus (Er) increased with an increase of volume fraction (φ2). For the treated calcium carbonate, however, Er decreased with an increase of φ2, at 3.4 vol% of phosphate coupling agent for calcium carbonate. PP filled with the treated calcium carbonate showed larger loss-tangent (tanδ) than PP filled with untreated calcium carbonate. The increment of tan δ was satisfactorily estimated from φ2 of calcium carbonate.View full abstractDownload PDF (1838K) -
Masayoshi OKUBO, Masaki KOJIMA, Yoshitaka MIZUSHIMA, Tsunetaka MATSUMO ...1984 Volume 41 Issue 11 Pages 673-678
Published: November 25, 1984
Released on J-STAGE: February 26, 2010
JOURNAL FREE ACCESSIn the chemical deposition of anionic emulsion particles of polyacrylic copolmer with the diameter less than 0.1μm, onto the anodized aluminium plate, the effects of medium pH and deposition temperature and the glass temperature (Tg) of base copolymer on the amount (Pd) of polymers deposited were studied. The Pd was increased remarkably with descending pH below pH 2 and was maximum at about 40°C, Below 40°C, Pd was increased with the ascending Tg, whereas above 40°C such a behaviour was not observed. From the scanning electron microscopical observation of coatings surface, it was clarified that there was a definite relationship between the deposition behaviour and the porosity structure of coating layers.View full abstractDownload PDF (1176K) -
Noriyuki KAMEDA, Miyabi HATTORI1984 Volume 41 Issue 11 Pages 679-683
Published: November 25, 1984
Released on J-STAGE: February 26, 2010
JOURNAL FREE ACCESSThe polymerization of some vinyl monomers with a dihydridorhodium complex [RhH2 (PhNNNPh) (PPh3) 2] -tetrahydrofuran (THF) system has been investigated. Methyl methacrylate (MMA), vinyl acetate, and styrene were polymerized with this system, while isobuthyl vinyl ether and acrylonitrile were not polymerized. The polymerization of these monomers could not be initiated with RhH2 (PhNNNPh) (PPh3) 2 alone. The polymerization of MMA with RhH2 (PhNNNPh) (PPh3) 2 in 1, 2-dimethoxy-ethane, diethyl ether and dimethyl sulfoxide was slower than that in THF, while no polymer was formed in other solvents such as benzene, acetone and N, N-dimethylformamide. The apparent overall activation energy for MMA polymerization with a RhH2 (PhNNNPh) (PPh3) 2-THF system was estimated to be 16.1 kcal/mol. The composition curve of the copolymerization of styrene with MMA by the use of this initiator agreed with that of the radical polymerization. The polymerization of MMA was inhibited by 1, 1-diphenyl-2-picrylhydrazyl. Hence, it has been concluded that the polymerization of vinyl monomers in this system proceeds through a free-radical mechanism.View full abstractDownload PDF (687K) -
Toshihide INOUE, Hideo KOMATSU, Masana YANAGI1984 Volume 41 Issue 11 Pages 685-689
Published: November 25, 1984
Released on J-STAGE: February 26, 2010
JOURNAL FREE ACCESSThermal Properties of self-extinguishing poly [alkylene 1, 2-bis (2-bromophenoxy) -ethane-4, 4′-dicarboxylate] (Polyether-esters) have been studied. The glass transition temperatures of the polyetheresters are higher than those of the corresponding poly [alkylene 1, 2-bis (phenoxy) -ethane-4, 4′-dicarboxylate] because of the chain stiffness by the bromo substitution. However, the melting temperatures are almost the same because of the lower crystallinity by the bromo substitution. Poly [ethylene 1, 2-bis (2-bromophenoxy) -ethane-4, 4′-dicarboxylate] fibers could be melt-spun at 280°C without thermal decom-position. The fibers show a high initial modulus 158 g/d and have excellent UV stability.View full abstractDownload PDF (901K) -
Noriyuki TAJIRI, Toshie TANAKA1984 Volume 41 Issue 11 Pages 691-697
Published: November 25, 1984
Released on J-STAGE: February 26, 2010
JOURNAL FREE ACCESSIn the polycondensation in the thin film form of poly (ethylene terephthalate) (PET), the diffusion coefficient and the rate constant of reaction were proportional to-8 power and-1.18 power, respectively, of the polymerisation degree of PET. In order to find the accurate solution of partial differential equations for the polycondensation, Double Collocation Method was applied. We confirmed that the above method was suitable for the analysis of the polycondensation of PET. In addition, we evaluated the rate of calculation of Double Collocation Method by comparing it with that of Euler's Method or Galerkin's Method and also the accuracy by comparing extrapolation value with exact solution at the limiting condition when the thickness of film was regarded as zero.View full abstractDownload PDF (970K) -
Toshimasa HASHIMOTO, Mizuho KINOSHITA, Chiaki SUZUKI, Akira TAKAKU1984 Volume 41 Issue 11 Pages 699-703
Published: November 25, 1984
Released on J-STAGE: February 26, 2010
JOURNAL FREE ACCESSA semiconductive polymer, which had a polyene structure in the main chain and had dipoles in the pendant groups, was obtained by dehydrochlorination of poly (α-chloroacrylonitrile). The visible absorption spectrum of dehydrochlorinated PCAN was analyzed on a free electron model. In case of dehydrochlorinating PCAN heat-treated at 370 K in film form, the conjugation of about twenty four π electrons was formed and the electrical conductivity increased from 10-16S/m for the starting PCAN to 10-8 S/m. The PCAN films dehydrochlorinated by this heat treatment were soluble in dimethylformamide (DMF) and could be re-cast to film from a DMF solution. On the heat treatment in film form at a relatively higher temperature of 410 K, the electrical conductivity first increased with increasing treatment time and then decreased. By the heat treatment at this temperature a PCAN film became insoluble in DMF. In case of dehydrochlorinating with triethylamine or by heat treatment in solution, the conjugation of about ten to twelve electrons was given. The electrical conductivity scarcely increased although the extent of dehydrochlorination was high, and a considerable decrease in molecular weight was found.View full abstractDownload PDF (733K)
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