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Volume 65, Issue 1
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[in Japanese]1992 Volume 65 Issue 1 Pages 1
Published: 1992
Released on J-STAGE: July 09, 2007
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[in Japanese]1992 Volume 65 Issue 1 Pages 2
Published: 1992
Released on J-STAGE: July 09, 2007
JOURNAL FREE ACCESSDownload PDF (122K) -
[in Japanese]1992 Volume 65 Issue 1 Pages 3-9
Published: 1992
Released on J-STAGE: July 09, 2007
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Dedicated to Professor Dr. Shinzo Yamashita on the occasion of his retirement from Kyoto Institute of TechnologyS. BUALEK, S. KOHJIYA1992 Volume 65 Issue 1 Pages 10-18
Published: 1992
Released on J-STAGE: July 09, 2007
JOURNAL FREE ACCESSThis short review describes the most recent advances in the study on liquid crystalline elastomers (LCE). Concise description on liquid cryatals and liquid crystalline polymers is also given. LCE exhibits liquid crystalline state that resembles to its precursor in the uncrosslinked state. Within the mesophase range of temperature, elastic properties of LCE are different from conventional elastomers in the sense that they are energetic in nature. This is due to the partially ordered alignment of the mesogens. It was noted, however, that the optical anisotropy remained even far above clearing temperature (Tc), up to Tc+30°C, if the specimen was under stress. Volume change of LCE with applied field is also interesting. This phenomenon leads to a high tendency of using cholestric or smectic C* LCE as a piezoelectric sensor because of the flexibility and the shape stability.View full abstractDownload PDF (1081K) -
[in Japanese]1992 Volume 65 Issue 1 Pages 19-20
Published: 1992
Released on J-STAGE: July 09, 2007
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Tomohiro KURAMOCHI, Tomohisa OHTA, Takehiko KIKUCHI, Yoshitaka GOTO, M ...1992 Volume 65 Issue 1 Pages 21-28
Published: 1992
Released on J-STAGE: July 09, 2007
JOURNAL FREE ACCESSThe elastomers were modified by polymerization of methyl methacrylate (MMA) onto hydrogenated styrene isoprene block copolymer (HSIS) and styrene isoprene block copolymer (SIS). Grafting efficiency of HSIS and SIS increased with increasing the concentration of monomers. Grafting of SIS increased with increasing the concentration of monomers but that of HSIS decreased with increasing it. Grafting and grafting efficiency of HSIS and SIS increased by adding a small amount of Lewis acid (ZnCl2) but then decreased by further addition. Grafting of HSIS and SIS increased with increasing the concentration of initiators but Grafting efficiency of these decreased with increasing it.
HSIS of high grafting polymers were modified to hard and transparent polymers.View full abstractDownload PDF (842K) -
NUMERICAL ANALYSIS OF CURE CURVES UNDER STEADY CURE CONDITIONS USING AN OSCILLATING CUREMETERHideyuki KONDO, Saburo ONO, Yasuo HANADA, Hiroyuki HOSHISHIMA, Yoshita ...1992 Volume 65 Issue 1 Pages 29-34
Published: 1992
Released on J-STAGE: July 09, 2007
JOURNAL FREE ACCESSNumerical studies on curing states under unsteady cure conditions in the vulcanization process of rubber goods were attempted in order to evaluate curing states precisely. In detail, a numerical model as a function of cure time, having a parameter of cure temperature, was presented for cure curves on oscillating curemeter. Having obtained this model, FEM analysis of heat transfer problem is expected to estimate the curing states under arbitrary cure conditions, quantitatively.
In the present paper, the cure curves on oscillating curemeter at three cure temperatures (125, 145, 165°C) are analyzed numerically, as an initial approach of this study. The numerical model for relative cure states is proposed to apply to logarithmic normal probability distribution type function approximately. The model is disclosed to be applicable to the phenomenal analysis of cure curves. As this model is based on the percentage of torque value on curing test, relative cure states, the estimated value should be necessary to be related to the practical cure states by solvent swelling test. The solvent swelling data relating to equilibrium state were obtained at several points on each cure curves. As a result, it is clarified that the relative curing state is approximated to have a negative correlation with swelling data within the range of the experiment.View full abstractDownload PDF (686K) -
Chifei WU, Shigeo ASAI, Masao SUMITA, Keizo MIYASAKA1992 Volume 65 Issue 1 Pages 35-41
Published: 1992
Released on J-STAGE: July 09, 2007
JOURNAL FREE ACCESSThe dispersion state of carbon black (CB) in polymer blends which are incompatible with each other and temperature dependences of electrical conductivity of these composities were studied. The electrical conductivity of composities was measured as a function of temperature in heating and cooling cycles. It was found that CB distributes unevenly in each component of the polymer blend. This uneven distribution of fillers in polymer blend matrices has much effect on the electrical conductivity of composites and their temperature dependences. The extent of PTC (Positive Temperature Coefficient of resistivity) of composites depends on the blend ratio of filler rich phase and dispersion state of CB in this phase. The electrical conductivity of CB filled crystalline polymer blends composed of high density polyethylene (HDPE) and polypropylene (PP) shows a prominent PTC below melting temperature and rapid decrease (NTC) above it at particular blend ratio of HDPE. However, the electrical conductivity of CB filled crystalline and amorphous polymer blend, i.e., HDPE/PMMA (poly (methyl methacrylate)) does not show such a large temperature dependences of conductivity at same blend ratio of HDPE. This prominent temperature dependence of conductivity is due to the changes of inter-conductive domain-gap of filler rich phase (HDPE), accompained with thermal expansion of another crystalline polymer, PP.View full abstractDownload PDF (881K) -
STUDY ON THREE-DIMENTIONALLY STRESSED FATIGUE OF NR/SBR BRENDED RUBBERKunihiko FUJIMOTO, Yutaka IMURA1992 Volume 65 Issue 1 Pages 42-54
Published: 1992
Released on J-STAGE: July 09, 2007
JOURNAL FREE ACCESSFatigue processes, fatigue life times and fatigue fracture patterns by three-dimentional stresses were investigated with carbon black filled solution-polmerzed SBR; blended rubber of SBR*, that is modified at the end of SBR polymer chains by functional groups; and NR. The results are as follows: (1) Rubber phases of NR and SBR, and SBR*. Dissolved structures are formed by polymer chains of NR and SBR (SBR*) at their boundaries and they become obstacles to propagations of micro-cracks generated by fatigue. (2) Volumes and strengths of entanglements of polymer chains in boundaries of NR/SBR blended rubber are different from those in NR/SBR* blended rubber. NR/SBR blended rubber has shorter life than in NR/SBR* blended rubber, because volumes of entanglements of polymer chains in boundaries are decreased by fatigue. (3) Fracture patterns are controlled by velocities of a formation process of anisotropic layer structures and a generation process of surfase cracks. Fractures grow in lateral direction to NR system, because the formation of anisotropic layer strucures is faster. Fractures grow in radial direction to blended rubber systems, because the formation of surface cracks is faster.View full abstractDownload PDF (1445K) -
[in Japanese]1992 Volume 65 Issue 1 Pages 57-58
Published: 1992
Released on J-STAGE: July 09, 2007
JOURNAL RESTRICTED ACCESSDownload PDF (251K)
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