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Volume 59, Issue 11
Displaying 1-8 of 8 articles from this issue
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Feng XUE, Tomokazu KOBAYASHI, Takao KIMURA, Masahiro MINABE, Michihiro ...2002 Volume 59 Issue 11 Pages 673-680
Published: November 25, 2002
Released on J-STAGE: March 15, 2010
JOURNAL FREE ACCESSAs a part of the improvement in liquefaction techniques of waste expanded polystyrene (EPS), the pyrolysis of EPS with α-methylstyrene (MSM) or 2, 4-diphenyl-4-methyl-1-pentene (MSD) as a chain-transfer agent was studied at a temperature of about 200°C. Eight kinds of spherical fillers with different material or size were each loaded in the reaction system and the synergistic effect of the spherical fillers and additives was investigated. The molar ratio of MSM or MSD to EPS decreased when the scale of EPS increased from 2.5g to 5g, but the absolute weight did not change. The efficiency of heat-transmission was improved by loading of the fillers. When the stainless fillers were loaded in the system of the MSM additive, the molecular weight of EPS lowered with an increase in the total surface area of the fillers. But this tendency was not found in the system of the MSD additive because of the high viscosity of the system.View full abstractDownload PDF (1414K) -
Polyamide-Polyolefin Nano-AlloyItaru NATORI2002 Volume 59 Issue 11 Pages 681-686
Published: November 25, 2002
Released on J-STAGE: March 15, 2010
JOURNAL FREE ACCESSThe effect of an olefinic functionalized-oligomer on the properties of polyamide (PA) was investigated. The hydrogenated polybutadiene with trimellitic anhydride (TA) group at both polymer chain ends (TA-HPB) was synthesized by the condensation reaction of hydrogenated polybutadiene with hydroxyl (-OH) group at both polymer chain ends (HO-HPB) and trimellitic anhydride chloride. The polyamide (PA) -polyolefin (PO) nano-alloys could be prepared from PA 66 and TA-HPB by using the blending process with a heat twin screw extruder. The tensile strength and Izod impact strength of PA-PO nano-alloy were affected by the content of TA-HPB. The elastomer-toughened PA 66 with PA-PO nano-alloy and ethylene-propylene copolymer (EPR) or hydrogenated styrene-butadiene copolymer (HSBS) have high values of Izod impact strength.View full abstractDownload PDF (2187K) -
Super-Toughened Polyamide CompositeItaru NATORI2002 Volume 59 Issue 11 Pages 687-693
Published: November 25, 2002
Released on J-STAGE: March 15, 2010
JOURNAL FREE ACCESSThe preparation and properties of elastomer-toughened polyamide 66 (PA 66) containing hydrogenated polybutadiene with trimellitic anhydride groups at both polymer chain ends (TA-HPB) were investigated. The Izod impact strength was affected by the content of TA-HPB and by the proportion of modified-elastomer to total elastomer. The addition of more than 1 part by weight of TA-HPB per 100 parts by weight of elastomer-toughened PA 66 was a very important technique. Despite the small amount of modified-elastomer, the high value of Izod impact strength was able to be kept by using this technique. A large number of fine elastomer particles were observed in the elastomer-toughened PA 66 containing TA-HPB. Finally, an optimum composition of PA 66, modified-elastomer, elastomer, and TA-HPB was proposed as a new super-toughened PA 66 with the high Izod impact strength, high flexural modulus, and low melt viscosity.View full abstractDownload PDF (3404K) -
Kenji NAGATA, Mitsuharu INABA, Naoki TOGE, Kiyohisa TAKAHASHI, Yuji AO ...2002 Volume 59 Issue 11 Pages 694-701
Published: November 25, 2002
Released on J-STAGE: March 15, 2010
JOURNAL FREE ACCESSThe effects of the localization of carbon black (CB) particles on the electrical resistivity of a CB-filled polypropylene (PP) /polyethylene (HDPE) polymer blend were investigated. CB particles were first compounded with PP. The CB/PP composite was subsequently compounded with HDPE to make the 2-step blending composite. CB particles dispersed in PP phase tend to move from PP phase to HDPE phase in the 2-step blending composite. Consequently, CB particles are localized at the PP/HDPE interface. When both of the PP and HDPE phases are continuous, it is expected that CB particles localized at the PP/HDPE interface will form a conductive network in the blend. Experiments showed that the 2-step blending composite exhibited a lower room temperature resistivity and much higher PTC (positive temperature coefficient) intensity than the simultaneous blending composite. These results suggest that CB particles localized at the PP/HDPE interface are effective for the electrical conductivity, and that the conductive network formed at the interface is prone to expand with the thermal expansion of the matrix polymer. The localization of CB particles was confirmed by transmission electron microscopy (TEM) observations.View full abstractDownload PDF (2704K) -
Ryutaro OGAWA, Yukio NAGASAKI, Takashige MURATA2002 Volume 59 Issue 11 Pages 702-705
Published: November 25, 2002
Released on J-STAGE: March 15, 2010
JOURNAL FREE ACCESSPolystyrene was synthesized by living free radical polymerization in the presence of TEMPO (2, 2, 6, 6-tetramethylpiperidine-1-oxy). The molecular weight distribution (Mw/Mn.) of TEMPO-polystyrene was relatively low. In order to remove the TEMPO end group, TEMPO-polystyrene was treated with thioacetic acid. From the ESR analysis of TEMPO-polystyrene, strong radical signals were observed for TEMPO-polystyrene in xylene at 110°C, while no signal was observed for that after the thioacetic acid treatment. The thermal stability of TEMPO-polystyrene and the modified polystyrene was investigated by TGA. The thioacetic acid treatment was found to improve the thermal stability of the obtained polystyrene effectively.View full abstractDownload PDF (742K) -
Kenji MOROTA, Akihiko TANIOKA, Yutaka YAMAGATA, Kozo INOUE2002 Volume 59 Issue 11 Pages 706-709
Published: November 25, 2002
Released on J-STAGE: March 15, 2010
JOURNAL FREE ACCESSThin film chips were prepared from polyethylenglycol and polyacrylicacid aqueous solutions by using the electrospray deposition (ESD) method. The surface morphologies of the deposited chips were observed by using scanning electron microscopy (SEM). The SEM images showed that the polymer molecular weight was related to the surface structure formation of the thin film. The thin film surface mainly consisted of overlaps of particles whose diameters were about 0.5μm. When the polymer molecular weight was increased, some fibers that had 50-100nm diameter were observed on the surfaces for both polymers.View full abstractDownload PDF (1081K) -
Kenji MOROTA, Akihiko TANIOKA, Yutaka YAMAGATA, Kozo INOUE2002 Volume 59 Issue 11 Pages 710-712
Published: November 25, 2002
Released on J-STAGE: March 15, 2010
JOURNAL FREE ACCESSAlpha-lactalbmin and invertase chips were produced by electrospray deposition (ESD) method. The surface morphology of the deposited chips was observed by using scanning electron microscopy (SEM). The SEM images showed that solute, spray time and concentration of solution were related to the surface morphology. The chip surface mainly consisted of overlaps of particles. The forms of the particles changed with the solution used: the form of alpha-lactalbumin particle was disordered but that of invertase particle was spherical.View full abstractDownload PDF (1702K) -
Katsuo ORIHARA, Satoru TAKANO, Katsuhiro AOKI2002 Volume 59 Issue 11 Pages 713-715
Published: November 25, 2002
Released on J-STAGE: March 15, 2010
JOURNAL FREE ACCESSThe blend board of poly (ethylene oxide) and poly (methyl methacrylate) was annealed with a temperature gradient between its top and bottom in the temperature range above the melting point or flowing temperature of the polymers. The cross section structure of the annealed board was observed by using polarizing microscopy and Fourier transform infrared spectroscopy. The cross section structure along the thickness of the board was first controled from normal phase separation of sea-island structure to gradient composite structure and further to the step structure with progress of annealing time of 0min., 170min. and 360min. respectively, even when the temperature gradient was kept constant. Such a result suggests the possibility of a self-organizing molding technology to form and control the layer composite structure of a polymer blend.View full abstractDownload PDF (950K)
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