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Volume 61, Issue 11
Displaying 1-10 of 10 articles from this issue
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[in Japanese]1988 Volume 61 Issue 11 Pages 741-748
Published: 1988
Released on J-STAGE: July 09, 2007
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[in Japanese]1988 Volume 61 Issue 11 Pages 749-758
Published: 1988
Released on J-STAGE: July 09, 2007
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[in Japanese]1988 Volume 61 Issue 11 Pages 759-765
Published: 1988
Released on J-STAGE: July 09, 2007
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[in Japanese]1988 Volume 61 Issue 11 Pages 766-768
Published: 1988
Released on J-STAGE: July 09, 2007
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[in Japanese]1988 Volume 61 Issue 11 Pages 769-771
Published: 1988
Released on J-STAGE: July 09, 2007
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Kenkichi MURAKAMI, Hidetoshi OIKAWA, Kyung-Do SUH1988 Volume 61 Issue 11 Pages 772-778
Published: 1988
Released on J-STAGE: July 09, 2007
JOURNAL FREE ACCESSIt is still impossible to find out a molecular-weight distribution of a crosslinked polymer, becasue of its insolubility into solvents and its infusibility to high temperatures. This paper deals with a simple determination method of such a distribution of a crosslinked polymer by a new means of chemorheology.
For the network chains having x-degree, the following relations are established.
Nx(t)=Nx(0)•e-xkt (1), qm, x(t)=x•Nx(0)•k•t (2)
Here, N(0): the number of moles of network chains per unit volume before degradation, N(t): those after t of degradation, qm(t): the number or moles of scissions along mainchains per unit volume, x: the polymerization degree between two crosslinks, k: the proportionality constant for the scission along mainchains.
The total number of elastically effective chains, N(t) is the sum over all chain-lengths as follows. N(t)=∑<∞><x=1>Nx(t)=∑<∞><x=1>Nx(0)•e-xkt (3)View full abstractDownload PDF (734K) -
Hideo Takamatsu, Masao Ishii, Shobu Minatono1988 Volume 61 Issue 11 Pages 779-787
Published: 1988
Released on J-STAGE: July 09, 2007
JOURNAL FREE ACCESSThe typical properties and the applications of the hydrogenated liquid polyisoprene with low molecular weight, was examined.
The heat resistance of the polyisoprene is considerably improved by the hydrogenation more than 60% of its carbon-carbon double bonds.
The partially hydrogenated polyisoprene, which remains a few double bonds, is vulcanizable with conventional manners, for example using sulfur or peroxides. The hydrogenated polyisoprene has good compatibility with the less unsaturated rubber, for instance EPDM or IIR. Furthermore, the partially hydrogenated polyisoprene with the adequate hydrogenation ratio can be co-vulcanizable with EPDM, IIR. So, it can be used as the reactive plasticizer for them.
It can be blended to another saturated polymers. As SEBS has good heat resistance, the plasticizer with good heat resistance is desirable for it. The hydrogenated polyisoprene is suitable for SEBS, because it has good heat resistance and enough compatibility with SEBS. It makes better the low temperature properties of SEBS. Its compatibility with PP is also good. The addition of it to PP increases the printability of PP. The hydrogenated polyisoprene will be expected as a good modifier for these polymers.View full abstractDownload PDF (952K) -
Minoru HIRAMATSU, Mamoru OCHI, Souji KODAMA, Hitoshi KAWASAKI1988 Volume 61 Issue 11 Pages 788-793
Published: 1988
Released on J-STAGE: July 09, 2007
JOURNAL FREE ACCESSThe effect of the surface morphology and silane coupling treatment in an electroplated zinc-silica dispersion coating on the adhesion of rubber has been studied by shear tensile test. Rubber adhesion strength to an electroplated zinc and zinc-silica dispersion coatings with a surface roughness of 7μm were about 2 to 5 times those with smooth surface. However, the adhesive failure after shear tensile test occurred predominantly at the interface of electrodeposit/primer. On the other hand, the adhesion of rubber to an electroplated zinc-silica dispersion coatings treated with silane coupling agent after salt spray test for 100hrs had the same adhesion strength as that of the initial adhesion, and no addhesive failure occurred at the interface of electrodeposit/primer. In addition, the electroplated zinc-silica dispersion coatings treated with silane coupling agent demonstrated far better rubber adhesion even when the primer was not used. The results are discussed in terms of the synergistic effect of the controlled surface morphology of the electrodeposit and the chemical bonding based on the silane coupling agent fixed onto the electrodeposit.View full abstractDownload PDF (877K) -
Michio ASHIDA, Toru NOGUCHI, Satoshi MASHIMO1988 Volume 61 Issue 11 Pages 794-800
Published: 1988
Released on J-STAGE: July 09, 2007
JOURNAL FREE ACCESSPET short fibers were treated with RFL system and were filled together with carbon black in CR matrix. 13C-NMR spectra of PET-CR composites were measured in solid state at 25°C. The spectra of CR matrix showed four sharp peaks which were ascribed to the carbon linked by different kinds of configurations. The 13C line widths were affected by fillers. The line widths of individual carbons of carbon black-filled CR were broader than those of ordinary CR by about two times. The spectra of RFL-treated PET-CR composites showed shoulders at about 4ppm higher field than the respective peaks of CR spectra after curing. It seems that the new shoulders arise from the restricted phase formed at the interfacial region between RFL-treated PET fibers and CR matrix.View full abstractDownload PDF (748K) -
[in Japanese]1988 Volume 61 Issue 11 Pages 801-802
Published: 1988
Released on J-STAGE: July 09, 2007
JOURNAL RESTRICTED ACCESSDownload PDF (201K)
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