研究领域

Damping and Acoustic Properties of Polymer and Polymer Composites

We are studying on the structure and properties of polymers and polymer composites with the aim of developing high-performance or functional polymer hybrids. In particular, the mechanical and electrical properties are of interest. For structure analysis we utilize a range of techniques such as WAXD, SAXS, FT-IR, NMR, and electron microscopy. Research Topics : Control of structure and properties of polymers by using high-pressure or supercritical CO2 Structure and propertied of biodegradable polymers Electrical conductive polymer composites filled with nano-carbon particles Ionic conductive polymer composites Damping materials and acoustic materials

近期论文

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"Utilization of Polymer Degradation to Modify Electrical Properties of Poly(L-lactide) / Poly(methyl methacrylate) / Carbon Filler Composites", Y. F. Buys, T. Aoyama, S. Akasaka, S. Asai, M. Sumita, Compos. Sci. Technol., 70, 2, 200-205 (2010) "Dynamic Percolation and Nanoparticle Induced Network Structural Development in Polymer-Carbon Nanotube Composites", Y. Konishi, C. K. Fai, P. M. Yan, S. Asai, M. Sumita, J. Mater. Sci. Soci. Japan, 47, 2, 87-97 (2010) "Transparency and Mechanical Properties of PLLA Films Treated with CO2", Y. Ikura, H. Takamori, S. Akasaka, S. Asai, M. Sumita, J. Mater. Sci. Soci. Japan, 46, 2, 81-87 (2009) "Effect of the Crystalline Morphology on Microcellular Foaming of Poly(L-lactide) with High-pressure Carbon Dioxide", S. Akaishi, H. Marubayashi, S. Akasaka, S. Asai, M. Sumita, J. Mater. Sci. Soci. Japan, 46, 2, 88-95 (2009) "Nafion/Sulfonated Mesoporous Silica Composites as Proton-conductive Membranes", I. Hong, S. Asai, M. Sumita, Y. Tominaga, J. Mater. Sci. Soci. Japan, 46, 2, 96-102 (2009) "ミクロスケールの海－島相分離構造を有するNBR／ポリエーテル電解質ブレンドのイオン伝導性に及ぼす湿度の影響", 富永洋一, 浅井茂雄, 住田雅夫, 日本ゴム協会誌, 82, 12, 499-506 (2009) "Structure and Morphology of Poly(L-lactide) Formed under High-Pressure CO2", H. Marubayashi, S. Akaishi, S. Akasaka, S. Asai, M. Sumita, Macromolecules, 41, 23, 9192-9203 (2008) "Dynamic percolation under electric field in carbon-black-filled conductive polymer composites", S. Asai, T. Kano, S. Akasaka, M. Sumita, 8th Fall Rubber Colloquium 2008, Hannover, Germany, Nov 26-28, p. 117 (2008) "Correlation between internal friction and sound absorption coefficient of panel-type sound absorber", S. Akasaka, T. Uchiyama, K. Saito, S. Asai, M. Sumita, 8th Fall Rubber Colloquium 2008, Hannover, Germany, Nov 26-28, p. 115 (2008) "Structure and properties of highly stereoregular isotactic poly(methyl methacrylate) and syndiotactic poly(methyl methacrylate) blends treated with supercritical CO2", S. Asai, T. Kawano, S. Hirota, Y. Tominaga, M. Sumita, Polymer, 48, 17, 5116-5124 (2007) "Structure and Degradation Behavior of PLLA and PMMA Blends", S. Asai, Y. Komatsu, T. Shirahase, Y. Tominaga, M. Sumita, KGK Kautschuk Gummi Kunststoffe, 2007, 7-8, 372-375 (2007) "Sound Absorption of Organic Hybrid Comprised of Chlorinated polyethylene (CPE) and N,N’-dicyclohexyl-2-benzothiazolyl sulfenamide (DBS): Effect of Sample Vibration", S. Akasaka, K. Ishizaki, K. Saito, A. Igari, Y. Tominaga, S.Asai, M. Sumita, KGK Kautschuk Gummi Kunststoffe, 2007, 7-8, 398-3402 (2007) "Proton conduction in Nafion composite membranes filled with mesoporous silica", Y. Tominaga, I. Hong, S.Asai, M. Sumita, J. Power Sources, 171, 1, 530-534 (2007) "Relation between Ionic Conductivity and Solubility of CO2 in Pressurized Solid Polymer Electrolytes", Y. Tominaga, S.Asai, M. Sumita, Macromolecules, 40, 9, 3348-3354 (2007) "外部電気回路導入による圧電性高分子の粘弾性変化に寄与するパラメータの検討", 赤坂修一, 浅井茂雄, 住田雅夫, 伊達宗宏, 材料の科学と工学, 44, 5, 189-194 (2007) "The effect of CO2 treatment on the structure and properties of poly(L-lactide)", S. Asai, Y. Ikura, H. Marubayashi, Y. Tominaga, M. Sumita, 11th International Seminar on Elastomers (ISE 2007), Freiburg, Germany, September 23-27, p. 17-18 (2007) "Correlation between sample vibration and sound absorption phenomena of organic hybrid materials", S. Akasaka, K. Ishizaki, K. Saito, Y. Tominaga, S. Asai, M. Sumita, 11th International Seminar on Elastomers (ISE 2007), Freiburg, Germany, September 23-27, p. 129-130 (2007) "Preparation and Characterization of Proton Conductive Nafion Composite Membranes Filled with Sulfonated Mesoporous Silica", I. Hong, Y. Tominaga, S. Asai, M. Sumita, The Asian Workshop on Polymer Processing 2007, Daejeon, Korea, October 21-24, p. 95 (2007) "Ionic Conduction in NBR-Based Solid Polymer Electrolyte Blends", T. Yoshitani, Y. Tominaga, S. Asai, M. Sumita, The Asian Workshop on Polymer Processing 2007, Daejeon, Korea, October 21-24, p. 116 (2007) "The effect of high-pressure carbon dioxide treatment on the crystallization behavior and mechanical properties of poly(L-lactic acid)/poly(methyl methacrylate) blends", S. Hirota, T. Sato, Y. Tominaga, S. Asai, M. Sumita, Polymer, 47, 11, 3954-3960 (2006) "Miscibility and hydrolytic degradation in alkaline solution of poly(L-lactide) and poly(methyl methacrylate) blends", T. Shirahase, Y. Komatsu, Y. Tominaga, S. Asai, M. Sumita, Polymer, 47, 13, 4839-4844 (2006) "Low-Frequency Sound Absorption of Organic Hybrid Comprised of Chlorinated Polyethylene and N,N-dicyclohexyl-2-benzothiazolyl Sulfenamide", S. Akasaka, T. Tobusawa, Y. Tominaga, S. Asai, M. Sumita, J. Appl. Polym. Sci., 99, 6, 2878-2884 (2006) "Dynamic Percolation of Carbon Particles Filled Polymer Composites", M. Sumita, S. Asai, POLYCHAR-14 World Forum on Advanced Materials, Nara, Japan, Apr 17-22, p.61 (2006) "Structure and Properties of Poly(L-lactide) / Poly(methyl methacrylate) Blends Treated with High-pressure CO2", S. Asai, S. Hirota, Y. Tominaga, M. Sumita, IUPAC International Symposium on Advanced Polymers for Emerging Technologies, Busan, Korea, Oct 10-13, Abs No. PO_B2_243 (2006) "Crystallization behavior of poly(L-lactide) film treated with high-pressure CO2", Y. Ikura, Y. Tominaga, S. Asai, M. Sumita, IUPAC International Symposium on Advanced Polymers for Emerging Technologies, Busan, Korea, Oct 10-13, Abs No. PO_B2_258 (2006) "Structure and Degradation Behavior of Poly(L-lactide) and Poy(methyl methacrylate) Blends", S. Asai, Y. Komatsu, T. Shirahase, Y. Tominaga, M. Sumita, 7th Fall Rubber Colloquium 2006, Hannover, Germany, Nov 8-11, p. 9-16 (2006) "Dynamic Percolation of Carbon Particle Filled Polymer Composites", M. Sumita, Y. F. Buys, G. Wu, S. Asai, 7th Fall Rubber Colloquium 2006, Hannover, Germany, Nov 8-11, p. 35-44 (2006) "The sound absorption materials for the lower frequency based on organic hybrid", S. Akasaka, A. Igari, Y. Tominaga, S. Asai, M. Sumita, 7th Fall Rubber Colloquium 2006, Hannover, Germany, Nov 8-11, p. 103-108 (2006) "高分子複合材料における充填剤としてのメソポーラスシリカ", 浅井茂雄, 富永洋一, 住田雅夫, ゼオライト, 23, 4, 117-124 (2006)