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Predecessor
Volume 71, Issue 3
Displaying 1-6 of 6 articles from this issue
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Comprehensive Papers
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Hiroshi SHIMIZU, Yongjin LI2014 Volume 71 Issue 3 Pages 69-88
Published: March 25, 2014
Released on J-STAGE: March 25, 2014
JOURNAL FREE ACCESSFour types of novel nanocomposites fabricated by high-shear processing have been investigated by TEM, TEM-EDX, and small-angle X-ray scattering. The relationship between the mechanical, electrical, and optical properties, and the morphology of the composites have also been investigated. The results indicate that high-shear processing can produce stable nanostructured blends and nanodispersed composites with properties impossible for classical blends and composites to achieve. Such a novel and simple strategy could be widely applied to the processing of other composites. The approach developed provides new methods of preparing other materials, which will lead to new applications of already existing materials.View full abstractDownload PDF (3500K)
Original Papers
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Toshiro WASHIZAKI, Toshihisa KAJIWARA, Yasuya NAKAYAMA2014 Volume 71 Issue 3 Pages 89-97
Published: March 25, 2014
Released on J-STAGE: March 25, 2014
JOURNAL FREE ACCESSA numerical analysis program of compression molding for cups has been developed and the method which reduces the forming load was simulated. It was found that the initial shape of the melted object affected the forming load and the forming load for a wide circular sheet having thickness distribution was lower than that for a cylindrical melt lump. We could also confirmed that the blank holder had an important effect to prevent from the dragging of a melted object into the core during the compression process. The seal part of cup was filled with melted resin in a comparatively earlier stage of compression compared with the case of using a melt lump. We could show that a wide circular sheet having a thickness distribution needs a lower forming load.View full abstractDownload PDF (1239K) -
Shotaro NISHITSUJI, Mikihito TAKENAKA, Naoya AMINO, Yasuhiro ISHIKAWA2014 Volume 71 Issue 3 Pages 98-103
Published: March 25, 2014
Released on J-STAGE: March 25, 2014
JOURNAL FREE ACCESSThe changes in the dispersion of carbon black in liquid isoprene under shear flow with time have been investigated with time-resolved ultra small angle X-ray scattering (USAXS). At the beginning of the experiment, the USAXS profiles have a shoulder at q = 0.07 nm−1, and the slope is 2.9 at 0.004 nm−1 < q < 0.01 nm−1, indicating that aggregates of carbon black with a mean radius of gyration of 14 nm form an agglomerated fractal network structure with a mass-fractal dimension of 2.9. During the application of shear flow, the scattering intensity increases in the whole q-region, and the shoulder reflecting the size of agglomerates shifts to q = 0.005 nm−1. The analysis by the Unified Guinier/Power-law approach yielded several characteristic parameters, such as the aggregate size, and the mass-fractal dimension. While the mean radius of gyration of agglomerates decrease with increasing time, the mean radius of gyration of the aggregates, the mass fractal dimension, and the surface fractal dimension is constant over time, indicating the aggregates peel off the surface of the agglomerates.View full abstractDownload PDF (912K) -
Katsuhiro YAMAMOTO, Koji OHARA, Guanghui CUI, Ryo TANAKA, Daiki SHIMAD ...2014 Volume 71 Issue 3 Pages 104-111
Published: March 25, 2014
Released on J-STAGE: March 25, 2014
JOURNAL FREE ACCESSThe orientation of cylindrical and lamellar micro-phase separated structures of some block copolymers (BCP) in thin films was investigated by grazing incident small-angle X-ray scattering and atomic force microscopy. The thin films were made from solution using selective solvents for the major component of the BCP. The spherical structure was arrested initially in the film with a thickness of 500 nm–1 µm. Solvent annealing, using common solvents, induced a morphology transition from spherical to a vertically oriented cylindrical (lamellar) structure. A neutral solvent for both components in the BCP was found to be effective for the perpendicular orientation of the micro-domains.View full abstractDownload PDF (915K) -
Kiyomasa SUZUKI, Masafumi YAMATO, Noriyuki HIROTA2014 Volume 71 Issue 3 Pages 112-118
Published: March 25, 2014
Released on J-STAGE: March 25, 2014
JOURNAL FREE ACCESSThe magnetic alignment of nylon 6 during melt crystallization was studied. The magnetic alignment of the α-form was determined by 2D-WAXD measurements, from which the easy axis of magnetization was estimated to be the a*-axis. The degree of orientation of the magnetically aligned nylon 6 was found to be independent of the melting conditions. Polarized optical microscopy suggests that nylon 6 crystallizes with a high nucleation density under any melting conditions. The induction period for isothermal crystallization increased with increasing melting temperature but the ensuing crystallization was not affected by the melting temperature. These results suggest that the oriented structure, which can be rotated by a magnetic torque, only exists in the initial stages of crystallization, resulting in the same value for the orientation degree for all samples.View full abstractDownload PDF (769K) -
Tomomi ENDO, Fumie KATAYAMA, Hiromu SAITO, Kazuki TOKUICHI, Noboru HIG ...2014 Volume 71 Issue 3 Pages 119-124
Published: March 25, 2014
Released on J-STAGE: March 25, 2014
JOURNAL FREE ACCESSBlends of poly(methyl methacrylate) (PMMA) and poly(vinyl butyral) (PVB) exhibit zero-birefringence due to the compensation of negative birefringence of PMMA and positive birefringence of PVB, respectively. The zero-birefringence composition of drawn-quenched specimens was found to be quite different from that induced by deformation at room temperature. The zero-birefringence composition was calculated by the additivity of the orientation and/or distortion birefringence of the neat component polymers, which were evaluated by the curve fitting procedures of the relaxation birefringence and relaxation stress. The calculation results revealed that the birefringence of the drawn-quenched specimens is attributed to the orientation birefringence in the glassy state while that of the deformation at room temperature is attributed to both orientation and distortion birefringence at room temperature.View full abstractDownload PDF (619K)
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