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Volume 32, Issue 11
Displaying 1-10 of 10 articles from this issue
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Reaction of Biphenyltetrazonium Chloride-Cu (I), Fe (II) Complexes with Water-soluble Vinyl MonomersShogo NIINO, Shigeru HAYAMA1975 Volume 32 Issue 11 Pages 627-633
Published: November 25, 1975
Released on J-STAGE: February 26, 2010
JOURNAL FREE ACCESSA specific radical copolymerization reaction without an initiator was studied by heating a suspension of the biphenyltetrazonium chloride (BTC) -Cu (I) or BTC-Fe (II) complex in water containing water-soluble monomers-acrylamide (AAm) and acrylic acid (AA). Biphenyl contents of poly (AAm-co-biphenylene) or poly (AA-co-bipnenylene) increased nearly in proportion to the increase in the feed ratio of the complexes, and azeotropic points were observed at near 50mol% of the complexes in feed. The decomposition temperature of poly (AAm-co-biphenylene) containing 77 mol% of biphenyl unit was higher than that of polyacrylamide by 40°C. The copolymer showed good solubility in benzene, chloroform and dimethylformamide. Poly (AA-co-biphenylene) containing more than 50mol% of biphenyl unit did not show the melting point below 300°C, and its solubility in benzene increased, while the solubility in aqueous alkaline solution reduced.View full abstractDownload PDF (1184K) -
Masami INOUE, Takayuki OTSU1975 Volume 32 Issue 11 Pages 634-640
Published: November 25, 1975
Released on J-STAGE: February 26, 2010
JOURNAL FREE ACCESSRadical polymerization of methacrylic acid (MAA) (I) in the presence of polyacrylamide (PAM) (II) in water has been investigated to clarify the polymer effect of the added II. It was observed that the presence of II affects on the polymer yield and molecular weight in the polymerization of I. From conductivity and turbidity measurements, it was found that II interacts with I monomer and polymer through an electrostatic force, hydrogen bonding, or hydrophobic bonding. The observed effects of the concentrations of PAM, MAA, and potassium persulfate initiator on the rate of the polymerization were discussed on the basis of these interactions. The polymerization of acrylamide in the presence of the polymer of I was also studied. Some properties of the polymer complex isolated were determined.View full abstractDownload PDF (1222K) -
Yasuo YUKI, Youji HAYAKAWA, Hisakazu HIRABAYASHI1975 Volume 32 Issue 11 Pages 641-644
Published: November 25, 1975
Released on J-STAGE: February 26, 2010
JOURNAL FREE ACCESSThe solution polymerization of 2-amino-4-N-methylanilino-6-isopropenyl-1, 3, 5-triazine (AMIT) was carried out at 50-80°C in dimethyl sulfoxide, using azobisisobutyronitrile as an initiator. The equibrium monomer concentrations ([M] e) were 0.067, 0.114, and 0.187 mol/l at 60, 70, and 80°C respectively. The heat of polymerization (ΔHp) and entropy of polymerization (ΔSp0) of AMIT derived from [M] e were-12.0 and -30.7 cal/Kmol, respectively. On the assumption of the depolymerization the rate of polymerization was expressed as
Rp=2.5×107 exp (-15300/RT) [I] 0.5 ([M] - [M] e).View full abstractDownload PDF (499K) -
Isao SASAKI, Kenichi ITO, Tsuneo KODAMA, Fumio IDE1975 Volume 32 Issue 11 Pages 645-652
Published: November 25, 1975
Released on J-STAGE: February 26, 2010
JOURNAL FREE ACCESSEffects of grafting of polypropylene on the properties of blend polymer comprising polypropylene and an inorganic compound were investigated. The mechanical properties of the blend polymer are improved by the grafting with a small amount of an unsaturated carboxylic acid or a carboxylic anhydride such as acrylic acid or maleic anhydride in an extruder. Water retards the grafting reaction and molecular-chain scission of polypropylene to decrease the fluidity, the tensile and flexural strength of the blend polymer. Combustion calory and melt dripping during the combustion of the blend polymer decrease with increasing concentration of the inorganic compound.View full abstractDownload PDF (1340K) -
Kozo KATAOKA1975 Volume 32 Issue 11 Pages 653-659
Published: November 25, 1975
Released on J-STAGE: February 26, 2010
JOURNAL FREE ACCESSTo make clear the flowing mechanism of liquid silk in the silkgland of a silkworm, Bombyx mori, the conformation of silk fibroin in the silkgland of a matured silkworm was studied by means of polarized microscope and X-ray diffraction. The results were compared and examined with the structure deformation by drawing the liquid silk extracted from the silkgland.
Sericin lubricates the layer between gland cell and liquid silk. The conformation of liquid silk depends on the diameter of the silkgland. The decrease of the diameter of the silkgland from the region of anterior part of middle division corresponds to the drawing of the liquid silk. The anterior silkgland plays an important role to cause an amorphous fibroin in the process of the flowing of liquid silk.View full abstractDownload PDF (3754K) -
Minoru MATSUDA, Fuminori AKIYAMA, Yoshinori HARA1975 Volume 32 Issue 11 Pages 660-664
Published: November 25, 1975
Released on J-STAGE: February 26, 2010
JOURNAL FREE ACCESSRing-opening cationic copolymerization of liquid SO2 with cyclohexene oxide has been studied in toluene with Lewis acids as catalyst. The existence of sulfite linkages in polymer main chain has been revealed from the analysis of the decomposition products of polymers with alkaline solution, and also from infrared spectrum of the polymers. A mechanism containing the insertion of oxysulfinium cation into polyether molecule has been ruled out, and a propagation mechanism of nucleophilic attack of SO2 molecule onto the growing oxonium ion was proposed.View full abstractDownload PDF (838K) -
Etsuo KOKUFUTA, Seiichi KOKUBO, Mitsuo HIRATA, Shinji IWAI1975 Volume 32 Issue 11 Pages 665-671
Published: November 25, 1975
Released on J-STAGE: February 26, 2010
JOURNAL FREE ACCESSElectrophoretic mobilities and viscosities of potassium poly (vinyl alcohol) sulfate (I) and trimethylammonium glycol chitosan iodide (II) were measured at pH 3-10 and the ionic strength μ of 0.05, 0.1, and 0.2, in buffer solution of HCl-NaCl, CH3COOH-CH3COONa, Na2HPO4-KH2PO4, and Na2CO3-NaHCO3. The dependences of limiting mobilities UC→0 and intrinsic viscosities [η] on pH and the dependence of [η] on UC→0 were investigated at constant μ. (i) UC→0, and [η] of I were independent of pH. (ii) UC→0 and [μ] of II were also independent of pH at pH <5 and> 7, but decreased with increasing pH from 5 to 7. (iii) The curves of UC→0 and [η] against pH for I and II shifted downward along the ordinate with increasing μ. (iv) [η] of I and II were proportional to each UC→0. The changes of the charge and conformation of the strongly polyacidic and polybasic ions caused by pH and μ were estimated from these results.View full abstractDownload PDF (1210K) -
Takao KIMURA, Takashi YAGINUMA1975 Volume 32 Issue 11 Pages 672-677
Published: November 25, 1975
Released on J-STAGE: February 26, 2010
JOURNAL FREE ACCESSSynthesis of poly (anidamic acid Schiff bases) is carried out by low temperature solution polycondensation of aromatic diamines with 4-chloroformyl phthalic anhydride and aromatic dialdehyde. In the polycondensation, the effects of the species of monomers and molar ratio of dialdehyde and 4-chloroformyl phthalic anhydride on the solubility of the polymers are studied. Soluble prepolymer, poly (amidamic acid Schiff base) is obtained from polycondensation of 4, 4′- methylenedianiline, 4, 4′-oxydianiline, or 4, 4′-thiodianiline with isophthalaldehyde and 4-chloroformyl phthalic anhydride in case that molar ratio of isophthalaldehyde, and 4-chloroformyl phthalic anhydride is lower than 50: 50. These soluble prepolymer can be converted to thermally stable poly- (amidimide Schiff bases) by suitable heating.View full abstractDownload PDF (999K) -
Naoya OGATA, Kohei SANUI, Keiichi ISHIKAWA1975 Volume 32 Issue 11 Pages 678-681
Published: November 25, 1975
Released on J-STAGE: February 26, 2010
JOURNAL FREE ACCESSCopolycondensation of dimethyl adipate and dimethyl 1, 2-ethanedithiol-S, S′-diacetate having sulfur atom at position α to the carbonyl group with hexamethylenediamine under various conditions was investigated. Methanol was found to have an accelerating effect on the polycondensation reaction of active dithioether ester with hexamethylenediamine at 30°C. It was found that solvents and polymerization temperatures influenced on compositions of resulting copolymers.View full abstractDownload PDF (625K) -
Hisayoshi YOSHIDA, Toshiharu MIKI, Seiji ARITA, Masanao NAKAGAWA1975 Volume 32 Issue 11 Pages 682-685
Published: November 25, 1975
Released on J-STAGE: February 26, 2010
JOURNAL FREE ACCESSThe cleavage of poly (vinyl chloride) (PVC) chain occurred in the Friedel-Crafts reaction of PVC with benzene was studied. In the case of AlCl3 catalyst, the molecular weight of tetrahydrofuran (THF) -soluble part of the reaction products decreased with the amount of benzene nuclei introduced into the PVC chain and the yield of the THF-insoluble part. When either benzene or AlCl3 was absent in the reaction system, the molecular weight of the THF-soluble part was larger than that of original PVC. The formation of 1, 3-diphenylpropane as one of degradation products of PVC was confirmed from gaschromatography. From these results, it was concluded that the cleavage of PVC chain occurred between the carbon atom substituted by benzene nuclei and the adjacent carbon atom. The case of FeCl3 catalyst was also discussed.View full abstractDownload PDF (709K)
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