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Volume 79, Issue 5
Displaying 1-6 of 6 articles from this issue
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Hidetoshi HIRAHARA, Sumio AISAWA, Satoshi TAKAHASHI, Hideki SAKURABA, ...2006 Volume 79 Issue 5 Pages 261-266
Published: May 15, 2006
Released on J-STAGE: March 12, 2010
JOURNAL FREE ACCESSIntercalation products of crosslinking agents such as 6-R-1, 3, 5-triazine-2, 4-dithiol monoanion (R is a substituent) into Mg-Al layered double hydroxide (RTD/LDH) have been synthesized with the calcination-rehydration reaction using Mg-Al oxide precursors calcined at 500°C for 2h. RTD/LDH has been modified by anionic surface active agent (AS/RTD/LDH). These organic-inorganic nanohybrids have been characterized by X-ray diffraction (XRD) and Fourier transform infrared (FT-IR) spectroscopy. Vulcanization reaction of chlorinated acrylic rubber by AS/RTD/LDH has been investigated for the scorch time, the apparent cure rate constant and the induction period by a swing die rheometer at 170°C. The basel spacing (003) was found to be 0.83nm for the intercalated product of 1, 3, 5-triazine-2, 4, 6-trithiol monoanion (TT/LDH) and 0.81nm for that of 6-dibutyl-1, 3, 5-triazine-2, 4-dithiol monoanion (DB/LDH), 0.78nm for the carbonate anion-intercalated LDH by XRD. The absorption peaks due to triazine ring (1580cm-1) and methylene (2950cm-1) were shown in the FT-IR spectrum of the TT/LDH and DB/LDH. These results indicate that TT or DB was intercalated into the LDH. The AS/RTD/LDH has shown the diffraction peak similar to the RTD/LDH. The induction period (t10) was 0.7-1min using 1, 3, 5-triazine-2, 4, 6-trithiol monosodium salt, in contrast to 10min using AS/TT/LDH. The crosslinking of chlorinated acrylic rubber using the AS/TT/LDH showed a proper induction period.View full abstractDownload PDF (915K) -
Kazuya NAGATA, Shigeki HIKASA, Katsushi NISHI, Hitoshi IWABUKI2006 Volume 79 Issue 5 Pages 267-270
Published: May 15, 2006
Released on J-STAGE: March 12, 2010
JOURNAL FREE ACCESSThe influence of addition of low density polyethylene-block-Polyacrylate copolymer (PE-diblock) on the impact strength of ternary phase polypropylene (PP) composites containing ethylene-propylene-diene terpolymer (EPDM) and talc was investigated. The surface of talc was treated with 3-glycidoxypropyltrimethoxysilane (GPMS) in order to enhance the interaction between talc surface and the functional group (carboxy group) of the additive copolymers. The composites were prepared by twin-screw extruder. The impact strength of PP/EPDM (5wt%)/talc (30wt%) increased markedly with the addition of PE-diblock content up to 3wt% and about 40% impact strength improvement was achieved for the composite by the addition of PE-diblock. Scanning electron micrograph observation of PP/EPDM/PE-diblock/GPMS-treated talc composite suggested that the edges of talc particles were included in elastomer phase on the basis of interaction between PE-diblock and elastomer.View full abstractDownload PDF (3520K) -
Kyoko HIRAOKA, Tomoko AISAKA, Tetsuo YOKOYAMA2006 Volume 79 Issue 5 Pages 271-276
Published: May 15, 2006
Released on J-STAGE: March 12, 2010
JOURNAL FREE ACCESSThe effects of the network imperfections such as dangling chains or abnormally long network chains on the properties of model polyurethane networks were studied. NCO-terminated prepolymer prepared from poly (oxypropylene) glycol with molecular weight 1, 000 and 2, 4-tolylene diisocyanate were end-linked with trimethylolpropane (TMP). The R-values, the molar ratio of OH group of TMP to NCO group of prepolymer, were varied in wide range. It is expected that dangling chains will form for R<1 and long network chains for R>1. Sol fraction and network chain densities were determined. Sol-free specimens were obtained by careful drying of those attained equilibrium swelling. Glass transition temperature, stress relaxation, dynamic mechanical property, and energy loss in repeated stretching were measured for both the sol-containing and sol-free specimens. The results are as follows. The values of effective network chain density agreed with those calculated from the consideration of network formation for R<1 region, but exceeded for R> 1 region. Though the values of properties are related well with the network chain density, the data lie on different plots for R<1 and R>1 region. The results were discussed on the basis of network imperfections.View full abstractDownload PDF (1042K) -
Kiyoshi SUNADA2006 Volume 79 Issue 5 Pages 277-281
Published: May 15, 2006
Released on J-STAGE: March 12, 2010
JOURNAL FREE ACCESSNovel synthesis method of silica-rubber composites were developed by sol-gel method with triethoxysilyl-modified polymer. This method could be applied to both of silica-SBR and silica-CR. In the both case of SBR and CR, mechanical properties such as tensile modulus were improved with an increase of the amount of modified polymer. SEM observation for these composites suggested that particle size of silica dispersed in unvulcanized rubber matrix became larger with the decrease of the silica content.View full abstractDownload PDF (8491K) -
IISRP, FES-TOC2006 Volume 79 Issue 5 Pages 282-289
Published: May 15, 2006
Released on J-STAGE: March 12, 2010
JOURNAL FREE ACCESSDownload PDF (3098K) -
2. Surface and Structure Analysis of Thin Polymer FilmsShin-ichi KIMURA2006 Volume 79 Issue 5 Pages 290-296
Published: May 15, 2006
Released on J-STAGE: March 12, 2010
JOURNAL FREE ACCESSAdvanced analytical measurements which use synchrotron radiation, sum frequency generation and positron annihilation have been applied to the surface and fine structure analysis of thin polymeric films.
The outline of each measurement and applications to polymeric materials are explained briefly, and examples of measurements in thin polymeric films are shown.View full abstractDownload PDF (6822K)
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