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Volume 54, Issue 5
Displaying 1-6 of 6 articles from this issue
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Kumakazu OHKITA, Naoki NAKAYAMA, Tohru OHTAKI1981 Volume 54 Issue 5 Pages 263-268
Published: May 20, 1981
Released on J-STAGE: November 20, 2012
JOURNAL FREE ACCESSThe graftpolymerization of methacrylates such as methyl methacrylate (MMA) and butyl methacrylate onto carbon black (CB) surface catalyzed by butyllithium (BuLi) or CB-BuLi complexes in toluene has been carried out at 0°C in nitrogen. Differing from styrene, the polymerization of MMA in the presence of CB by BuLi indicated that the initiation proceeds rapidly and that the reaction of BuLi with CB surface is negligible. The intrinsic viscosities of the homopolymer formed in the presence of HAF black with pretreated sodium borohydride solution were found to be lower than those of the ones formed in the presence of original black. Methacrylates grafted onto colour black surface by CB-BuLi complexes, differently from acrylonitrile, gave a gel containing CB particles. As the exceeding amount of free BuLi beyond the complex formation increases, the gel fractions decreased rapidly, paralleling an equally decrease in grafting ratio. Thus the grafting ratio could be changed by the amount of BuLi added originally as the complexes. Furthermore, the rate of polymerization of methacrylates by BuLi was much faster than that of graftpolymerization by CB-BuLi complexes. The mechanism for the formation of gel is proposed to explain these observations.View full abstractDownload PDF (745K) -
Isao SEKINE1981 Volume 54 Issue 5 Pages 269-276
Published: May 20, 1981
Released on J-STAGE: November 20, 2012
JOURNAL FREE ACCESSA measuring method to evaluate in a short time the quality of the corrosion protective properties and the process of deterioration of paint films on steel plate was studied by obtaining the values of tan δ and resistivity ρ. From the result of the frequency dependence on tan δ, the excellent paint films of the corrosion protective properties were a coal tar epoxy resin paint on brushing coating, and an acrylic resin paint on baking coating. For the purpose of an impedance measurement, a testing method in the system of the steel plate-paint film-mercury was found to be advantageous, because it was possible to measure impedance in a shorter time by that method than to measure it in 3% NaCl solution and it could deduce the corrosion protective properties of the paint film, and the paint film did not change with the passage of time. It was proved that the use of a phase-sensitive detector (PSD) was a more rapid and convenient method than an a. c. bridge as an impedance measurement. It was also found that there was high correlation between tan δ and resistivity, and the more excellent the paint film was, the lower the tan δ value was, and the higher the resistivity was.View full abstractDownload PDF (1092K) -
Nobuhiko KUROKI1981 Volume 54 Issue 5 Pages 277-286
Published: May 20, 1981
Released on J-STAGE: November 20, 2012
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Masayasu SUGIYAMA, Fumio HIRATA1981 Volume 54 Issue 5 Pages 287-295
Published: May 20, 1981
Released on J-STAGE: November 20, 2012
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Mitsuo MAEDA1981 Volume 54 Issue 5 Pages 296-308
Published: May 20, 1981
Released on J-STAGE: November 20, 2012
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Toshihei MISAWA1981 Volume 54 Issue 5 Pages 309-319
Published: May 20, 1981
Released on J-STAGE: November 20, 2012
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