結晶アルキル基を有するアクリル酸ナトリウムランダムコポリマーの水中ミクロ相分離
Yuki Horiike1, Makoto Ouchi1, Takaya Terashima1
1Department of Polymer Chemistry, Graduate School of Engineering, Kyoto University, Kyoto, Japan.
Macromolecular rapid communications
|December 30, 2025
まとめ
アルキル基を有するアクリル酸ナトリウム(ANa)コポリマーは、水中ミクロ相分離を起こす。このプロセスは、ラメラや体心立方格子相などの明確な構造を形成し、コポリマー組成と水分吸収の影響を受ける。
科学分野:
- 高分子化学
- 材料科学
- 超分子化学
背景:
- 結晶性アルキル側鎖を持つアクリル酸ナトリウム(ANa)コポリマーが合成される。
- これらのコポリマーは、制御された相分離挙動を示すように設計されている。
研究 の 目的:
- アクリル酸ナトリウムランダムコポリマーにおける水中ミクロ相分離を調査する。
- 吸水がこれらのコポリマーの形態とドメイン間隔にどのように影響するかを理解する。
主な方法:
- t-ブチルアクリレートとオクタデシル/ドコシルアクリレートのラジカル共重合。
- アクリル酸ナトリウムセグメントを形成するためのコポリマーの後修飾。
- 様々な湿度と温度下での吸水、相挙動、形態の分析。
主要な成果:
- 高湿度(>90%)下でコポリマーはかなりの量の水(13~37重量%)を吸収する。
- 吸水により、疎水性アルキル基と親水性ANaセグメント間のミクロ相分離が誘発される。
- 5~7 nmのドメイン間隔を持つ体心立方格子構造やラメラ構造などの特定の形態が観察された。
- あるコポリマーは、150°Cまで非晶質ラメラ構造を維持した。
結論:
- 吸水は、これらのANaランダムコポリマーにおけるミクロ相分離の重要なトリガーである。
- コポリマー組成とセグメント重量分率が、結果として生じる相挙動とナノ構造を決定する。
- これらの材料は、刺激応答性自己集合を必要とする用途に可能性を示す。
さらに関連する動画
09:02Using Polystyrene-block-polyacrylic acid-coated Metal Nanoparticles as Monomers for Their Homo- and Co-polymerization
Published on: July 9, 2015
12.7K
11:42Synthesis of Monodisperse Cylindrical Nanoparticles via Crystallization-driven Self-assembly of Biodegradable Block Copolymers
Published on: June 20, 2019
8.2K
関連する概念動画
Colloidal precipitates
5.7K
The high insolubility of some precipitates can result in an unfavorable relative supersaturation. This can lead to colloidal particles with a large surface-to-mass ratio, where adsorption is promoted. For instance, in the precipitation of silver chloride, silver ions are adsorbed on the surface of the colloidal particles, forming a primary layer. This layer attracts ions of opposite charge (such as nitrate ions), forming a diffuse secondary layer of adsorbed ions. This electric double layer...
5.7K
Ion Exchange
1.6K
Ion exchange chromatography separates charged molecules from a solution by reversibly exchanging them with mobile, or 'active', ions associated with the oppositely charged stationary phase. This method can be used to separate ions, soften and deionize water, and purify solutions. The polymers comprising the ion-exchange column are high-molecular-weight and chemically stable polymers, crosslinked to be porous and essentially insoluble. They are also functionalized with either acidic or...
1.6K
Ion-Exchange Chromatography
3.0K
Ion-exchange chromatography, or IEC, is a technique for separating ions based on their affinity for the stationary phase. The stationary phase is a cross-linked polymer resin with covalently attached ionic functional groups. The functional groups can be either positively charged (cation exchangers) or negatively charged (anion exchangers). A cation exchanger consists of a polymeric anion and active cations, while an anion exchanger is a polymeric cation with active anions. The choice of...
3.0K
Size-Exclusion Chromatography
2.8K
In size-exclusion chromatography (SEC), also known as molecular-exclusion or gel-permeation chromatography, molecules are separated based on their sizes. This technique is important for separating large molecules such as polymers and biomolecules. The two classes of micron-sized stationary phases encountered in SEC are silica particles and cross-linked polymer resin beads. Both materials are porous, but their pore sizes vary significantly.
Silica particles offer advantages such as rigidity,...
Silica particles offer advantages such as rigidity,...
2.8K
Capillary Electrophoresis: Applications
1.9K
Capillary electrophoretic separations offer various modes, each with unique applications. These modes include capillary zone electrophoresis, capillary gel electrophoresis, capillary array electrophoresis, capillary isoelectric focusing, capillary isotachophoresis, micellar electrokinetic chromatography, and capillary electrochromatography.
Capillary zone electrophoresis (CZE) separates ionic components based on their electrophoretic mobility. It has been used to separate proteins, amino acids,...
Capillary zone electrophoresis (CZE) separates ionic components based on their electrophoretic mobility. It has been used to separate proteins, amino acids,...
1.9K
