Fundamental Research on New Type of Molecular Assemblies, "High-Density" Polymer Brushes

新型分子组装体“高密度”聚合物刷的基础研究

• 批准号: 14350496
• 负责人: TSUJII Yoshinobu
• 金额: $ 10.82万
• 依托单位: KYOTO UNIVERSITY
• 依托单位国家: 日本
• 项目类别: Grant-in-Aid for Scientific Research (B)
• 财政年份: 2002
• 资助国家: 日本
• 起止时间: 2002 至 2004
• 项目状态: 已结题
• 来源: https://kaken.nii.ac.jp/en/grant/KAKENHI-PROJECT-14350496/
• 关键词: Polymer brush; Concentrated brush; Graft polymerization; Living radical polymerization; Surface; Triboligy; 原子間力顕微鏡; 反発力; 摩擦力; エントロピー弾性; 浸透圧; 中性子反射率測定; 相溶性; 重水素化ポリメタクリル酸メチル; グラフト密度; 高分子ブラシ; 電解質高分子; 膨潤特性; 解離度; ヘミアセタールエステル; 原子移動ラジカル重合

Recent successful application of living radical polymerization made it possible to graft various low-polydispersity polymers with exceptionally high graft densities. In this study, the structure and properties of such obtained concentrated polymer brushes were systematically investigated in a swollen and dry state. The most striking result concerns their tribological properties in a good solvent : the frictional coefficient (μ) between concentrated PMMA brushes was dramatically lower than that between the semi-dilute brushes, which was reasonably ascribed to little interpenetration of swollen concentrated polymer brushes due to the large osmotic pressure and highly stretched conformation (entropic interaction). The obtained μ value is one of the lowest values comparable to that achieved for polyelectrolyte semi-dilute brushes with the help of a charge effect. This study would provide a new concept toward precision surface modification for "super" lubrication.

近年来活性自由基聚合的成功应用，使接枝各种低多分散性聚合物具有极高的接枝密度成为可能。在这项研究中，这样得到的浓缩聚合物刷的结构和性能进行了系统的研究，在溶胀和干燥状态。最引人注目的结果涉及它们在良溶剂中的摩擦学性能：浓缩PMMA刷之间的摩擦系数（μ）显著低于半稀释刷之间的摩擦系数（μ），这合理地归因于溶胀的浓缩聚合物刷由于大的渗透压和高度拉伸的构象（熵相互作用）而几乎没有互穿。所获得的μ值是与借助于电荷效应获得的半稀刷的μ值相当的最低值之一。该研究为实现“超级”润滑的精密表面改性提供了新的思路。

项目成果

Glass transition temperatures of high-density poly(methyl methacrylate) brushes

• DOI: 10.1021/ma0255128
• 发表时间: 2002-07
• 期刊: Macromolecules
• 影响因子: 5.5
• 作者: S. Yamamoto;Y. Tsujii;T. Fukuda

Precise Surface Modification by Living Radical Polymerization

通过活性自由基聚合进行精确表面改性

• 发表时间: 2005
• 期刊: Sen-i Gakkaishi 61
• 作者: Y.Tsujii

Interaction Forces between Two Silica Surfaces in an Apolar Solvent Containing an Anionic Surfactant

含有阴离子表面活性剂的非极性溶剂中两个二氧化硅表面之间的相互作用力

• 发表时间: 2004
• 期刊: Langmuir 20
• 作者: C.E.McNamee

E.Marutani: "Surface-initiated atom transfer radical polymerization of methyl methacrylate on magnetite nanoparticles"Polymer. 45. 2231-2235 (2004)

E.Marutani：“甲基丙烯酸甲酯在磁铁矿纳米粒子上的表面引发原子转移自由基聚合”聚合物。

C.E.McNamee: "Interaction forces between two silica surfaces in an apolar solvent containing an anionic surfactant"Langmuir. 20. 1791-1798 (2004)

C.E.McNamee：“在含有阴离子表面活性剂的非极性溶剂中两个二氧化硅表面之间的相互作用力”Langmuir。