HIgher Order Structure of Polymer Gels induced by Phase Separation

相分离诱导聚合物凝胶的高阶结构

• 批准号: 09650996
• 负责人: KANAYA Toshiji
• 金额: $ 1.98万
• 依托单位: KYOTO UNIVERSITY
• 依托单位国家: 日本
• 项目类别: Grant-in-Aid for Scientific Research (C)
• 财政年份: 1997
• 资助国家: 日本
• 起止时间: 1997 至 1998
• 项目状态: 已结题
• 来源: https://kaken.nii.ac.jp/grant/KAKENHI-PROJECT-09650996/
• 关键词: 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

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.

采用广角中子散射、小角中子散射、光散射、超小角中子散射和共焦激光扫描显微镜技术研究了聚乙烯醇（PVA）溶液在二甲基亚砜（DMSO）与水、甘油与水的混合物中的凝胶化过程。结果表明，聚乙烯醇凝胶的交联点为微晶，微晶之间的平均距离约为200 *。凝胶在-20℃以上形成。C是不透明的，表明微相分离发生在凝胶化之前。时间分辨光散射测量直接证实了这一期望。用共焦激光扫描显微镜观察了微相分离引起的高阶结构。研究表明，控制相分离过程是控制高阶结构的关键，而高阶结构与凝胶的微观性质密切相关。

项目成果

K.Hara, A.Nakamura, N.Hiramatsu, T.Kanaya: "Low-energy excitation in hydrated gel" Physica. B241/243. 982-983 (1998)

K.Hara、A.Nakamura、N.Hiramatsu、T.Kanaya：“水合凝胶中的低能激发”物理学。

金谷利治: "Micro-and mesosoopic structure of Poly(ninyl alcohol)gels determined by neutron and light scattering" Supramolecular Science. (印刷中).

Toshiharu Kanaya：“通过中子和光散射测定聚（九醇）凝胶的微观和介观结构”超分子科学（正在出版）。

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)

Hiroki Takeshita：“聚乙烯醇凝胶的层次结构”《高分子科学与技术》杂志 55. 595-602 (1998)。

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)

Toshiharu Kanaya：“通过中子和光散射测定聚（乙烯醇）凝胶的微观和细观结构”超分子科学。5. 215-221 (1998)

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)

Toshiharu Kanaya：“通过中子和光散射测定聚（乙烯醇）凝胶的微观和介观结构”超分子科学。5. 215-221 (1998)