HIgher Order Structure of Polymer Gels induced by Phase Separation

• Project/Area Number: 09650996
• Research Category: Grant-in-Aid for Scientific Research (C)
• Allocation Type: Single-year Grants
• Section: 一般
• Research Field: 高分子構造・物性(含繊維)
• Research Institution: KYOTO UNIVERSITY
• Principal Investigator: KANAYA Toshiji Inst.for Chem.Res., Kyoto Univ., Ass.Prof., 化学研究所, 助教授 (20152788)
• Co-Investigator(Kenkyū-buntansha): NISHIDA Kohji Inst.for Chem.Res., Kyoto Univ., Instructor, 科学研究所, 助手 (80189290)
• Project Period (FY): 1997 – 1998
• Project Status: Completed (Fiscal Year 1998)
• Budget Amount: ¥3,100,000 (Direct Cost: ¥3,100,000); Fiscal Year 1998: ¥900,000 (Direct Cost: ¥900,000); Fiscal Year 1997: ¥2,200,000 (Direct Cost: ¥2,200,000)
• Keywords: Polymer / gels / correlation length / microphase separation / cross-linking points / small angle neutron scattering / light scattering / conforcul laser scanning microscope / ポリビニルアルコール(PVA) / 高分子ゲル / 共焦点レーザー顕微鏡 / 階層構造 / ポリビニルアルコール / 相分離

Research Abstract

Gelation process of poly(vinyl alcohol) (PVA) solutions in mixtures of dimethyl sulfoxide (DMSO) and water and glycelol and water have been studied using wide angle neutron scattering, small angle neutron scattering, light scatttering, ultra small angle neutron scattering and conforcul laser scanning microscope techniques. It was found that cross-linking points of the PVA gels are crystallites and the average distance between the crystallites is about 200 *. The gels formed above about -20 。C are opaque, suggesting that microphase separation occurs before the gelation. This expectation was directly confirmed by time resolved light scattering measurements. The higher order structure induced by the microphase separation was observed by conforcul laser scanning microscope. It was suggested in this research that how to control the phase separation process is a key to control the higher order structure which is closely related to microscopic properties of the gels.

Research Products

• [Publications] 金谷利治: "Micro-and mesosocopic structure of poly(vinyl alcohol)gels determined by neutron and light scattering" Supramoelcular Science. 5. 215-221 (1998)
  • Description: 「研究成果報告書概要(和文)」より
• [Publications] T.Kanaya, H.Takeshita, Y.Nishikoji, M.Ohkura, K,Nishida and K.Kaji: "Micro-and mesosocopic structure of poly (vinyl alcohol) gels determined by neutron and light scattering." Supramolcular Science. 5. 215-221 (1998)
  • Description: 「研究成果報告書概要(欧文)」より
• [Publications] K.Hara, A.Nakamura, N.Hiramatsu, T.Kanaya: "Low-energy excitation in hydrated gel" Physica. B241/243. 982-983 (1998)
  • Description: 「研究成果報告書概要(欧文)」より
• [Publications] H.Takeshita, T.Kanaya, K.Kaji, K.Nishida, Y.Nishikohji, M Ohkura: "Hierarchic Structure of Poly (vinyl alcohol) Gels" Koubunnshi Ronbunshu. 55. 595-602 (1998)
  • Description: 「研究成果報告書概要(欧文)」より
• [Publications] 金谷利治: "Micro- and mesosocopic structure of poly(vinyl alcohol)gels determined by neutron and light scattering" Supramoelcular Science. 5. 215-221 (1998)
• [Publications] 原 一広: "Low-energy excitation in hydrated ge" Physica B. 241/243. 982-983 (1998)
• [Publications] 竹下宏樹: "ポリビニルアルコールゲルの階層構造" 高分子論文集. 55. 595-602 (1998)
• [Publications] 金谷利治: "Micro-and mesosoopic structure of Poly(ninyl alcohol)gels determined by neutron and light scattering" Supramolecular Science. (印刷中).